Methods to Compute 

Long-Wave Radiation 

From the Atmosphere and 

Reflected Solar Radiation 

From a Water Surface

By GORDON E. KOBERG 

STUDIES OF EVAPORATION

GEOLOGICAL SURVEY PROFESSIONAL PAPER 272-F

Methods to compute long-wave radiation from the 

atmosphere and reflected solar radiation from 

meteorological data without the necessity of direct 

measurement

UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1964
UNITED STATES DEPARTMENT OF THE INTERIOR 

STEWART L. UDALL, Secretary

GEOLOGICAL SURVEY 

Thomas B. Nolan, Director

For sale by the Superintendent of Documents, U.S. Government Printing Office

Washington, D.C. 20402
CONTENTS

Page Page 

Abstract_____________--_-____ ______________________ 107 Solar radiation reflected from water surface___-____--__ 110

Radiation measurements_________---___________--__ 107 References cited_____________-___-_________-_---____ 112

Long-wave radiation relationships.____---____-_-____-_ 108

ILLUSTRATIONS

Page 

FIGURE 33. Radiation station showing pyrheliometer, flat-plate radiometer, and psychrometer._._.__________--____--__ 108

34. Curves showing the value of the c constant in Brunt's equation_________________--_-__----____-_----_-- 109

35. Clear-sky solar-radiation chart---____-_____________________________-___-___-__----------_----------- HI

36. Relationship to determine reflected solar radiation from measured solar radiation_____-__-_-_____---------- 111

TABLES

Page

TABLE 1. Computations of computed infrared radiation by Brunt's relationship as modified and compared with measurements of infrared radiation____________________________________________________-_--_-_-------------- HO

2. Infrared radiation from a black body for temperatures between 0° C and 39° C___________-------_---------- HO

3. Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and air-vapor pressure at various localities_---_________-__-_--__-_---__----------------------- H5

m

STUDIES OF EVAPORATION

METHODS TO COMPUTE LONG-WAVE RADIATION FROM THE ATMOSPHERE AND 

REFLECTED SOLAR RADIATION FROM A WATER SURFACE

By GORDON E. KOBEBG

ABSTRACT

Methods are presented for computing long-wave radiation 

from the atmosphere and reflected solar radiation from a water 

surface. The parameters needed to compute the long-wave 

radiation are air temperature, air-vapor pressure, and the ratio 

of measured solar radiation to clear-sky solar radiation. The 

long-wave determination is based on Brunt's equation in which 

the atmosphere is treated as a gray body. Computations by 

this method were made at 11 stations for periods of a week or 

longer and compared to long-wave radiation measurements 

made with a flat-plate radiometer. The average difference, 

without regard to sign, between the computed and the measured 

long-wave radiation was 5.2 percent or less for 9 of the 11 

stations. The method for determining reflected solar radiation 

requires only a measurement of solar radiation and -will be 

accurate within 10 percent.

Long-wave radiation from the atmosphere and reflected solar 

radiation from a water surface are important factors in the 

energy-budget equation for determining evaporation. In connection with its program of evaporation measurement, the U.S. 

Geological Survey has obtained direct measurements, of the 

received and reflected radiation for periods of from 1 to 2 years 

at a number of reservoirs. These reservoirs, all located in the 

arid West, lie in an area between lat 30° and 40° N and long 

95° and 120° W. The moisture content of the atmosphere in 

this area ranges from low, in the dry desert regions, to high, 

in the areas near the Gulf of Mexico. Data have been obtained 

at locations ranging in altitude from near sea level to 10,000 

feet.

The received and reflected radiation measurements have been 

used in a study of the relation of long-wave radiation to certain 

atmospheric characteristics such as temperature, vapor pressure, 

and cloud cover. Several authors have published studies of 

relations of this type, and results of the studies are frequently 

used in heat-budget studies in areas where direct-radiation 

measurements are not feasible.

RADIATION MEASUREMENTS

Early radiation measurements were made with the 

small 2- by 2-inch hemispherical radiometer (Dunkle 

and others, 1949), and later measurements were made 

with the larger Beckman-Whitley flat-plate radiometer. 

The latter instrument is a thin laminated plate sandwiched between two aluminum sheets. The exposed

surface of the upper sheet is painted black so that it 

will absorb all wave lengths, and the exposed surface 

of the lower sheet is left shiny to obtain a reflecting 

surface for all wave lengths. Inside the plate ar*s two 

sets of thermopiles: one set near the upper surface 

and the other near the lower surface. To insure that 

the lower surface of the plate receives no radiation, a 

radiation shield is located half an inch below the plate. 

When this shield is in place, a blower must be ur?ed to 

insure that the thermal convective losses will be equal 

on both sides of the plate.

The receiving surface absorbs the incident radiation, 

some of which is reradiated. The part that is reradiated 

may be computed, by using Stefan's Law, from the 

temperature of the receiving surface, which is determined by a thermocouple imbedded in the plate. The 

remainder of the absorbed radiation is carried away by 

forced convection from the upper and lower surfaces 

of the plate. Because very little of the energy carried 

away from the lower surface by convection is received 

from the surroundings, the energy lost from the lower 

surface by convection must have flowed through the 

plate. The temperature gradient between the upper 

and lower surface is a measure of the radiation abs orbed 

from the atmosphere and then lost by convection. 

The instrument is calibrated for the part of the absorbed 

radiation lost by convection by using a laboratory 

source of a known magnitude of radiation.

The accuracy of the instrument under the conditions 

of calibration is estimated to be within 3 percent, but 

this accuracy is not usually attained in the field. A 

positive or negative error is caused by a misorientation 

of the instrument with respect to the prevailing wind 

direction. This error is considered to be compensating 

for periods ofr a week or more and is significant only 

above wind speeds of 15 mph (Dunkle and others, 

1949). Another error occurs when rain falls on the

107
108 STUDIES OF EVAPORATION

sensing element and a part of the incident radiation is 

required to evaporate the water.

In the field, the largest error is probably due to the 

change in absorption characteristics of the painted 

receiving surface. Because these characteristics change 

with time, the accuracy of the instrument will decrease. 

In order to determine how great an error may occur, 

four radiometers were recalibrated after a year or more 

of use; the average change was 6 percent.

Despite some uncertainties about its accuracy, the 

radiometer described has given results for the evaporation studies that appear satisfactory.

In addition to measurements of infrared radiation, 

measurements of ambient-air temperature, humidity, 

and solar radiation are obtained at the same location. 

A typical field installation is illustrated in figure 33, 

which shows the thermocouple psychrometer, Eppley 

pyrheliometer, and the flat-plate radiometer. The flatplate radiometer measures both solar and infrared 

radiation. Long-wave radiation during the day is 

determined by subtracting solar radiation from the 

total radiation received by the flat-plate radiometer.

FIGURE 33.—A radiation station, showing the Eppley pyrheliometer to 

the left and the flat-plate radiometer to the right on top of the mast; 

directly below is the thermocouple psychrometer.

LONG-WAVE RADIATION RELATIONSHIPS

Most long-wave radiation from the atmosphere has 

wave lengths of between 4 and 120 /* (microns). In this 

wave-length range, water vapor, ozone, carbon dioxide, 

and oxygen have strong absorption bands. Some of 

these bands are narrow and do not occur frequently in 

the 4 to 120 fj. range. However, water vapor, which is 

the principal absorber of radiation in the atmosphere, 

has absorption bands throughout this range. Radiation

from the atmosphere, then must come from water vapor, 

ozone, carbon dioxide, and oxygen because, according to 

Kirchoff's law, they emit radiation as strongly as they 

absorb.

To avoid dealing with the highly variable content of 

water vapor in the air, some investigate rs (Brunt, 1944; 

Angstrom, 1920) have treated the atmosphere as a 

gray body, and others (Elsasser, 1942) have taken into 

account the variability of the water-vapor spectrum. 

The simplest method to determine long-wave radiation 

received at the surface is to treat the atmosphere as a 

gray body and choose a suitable emissivity. In this 

method, Stefan's law is used, the variable being the 

temperature of the ambient air, and is expressed by 

Brunt (1944) as

(1)

where

Qa=ihe radiation received, in cal cm"2 day"1 , 

(r=the Stefan Boltzmann constant, 5.6697X10"5

erg cm"2 sec"1 (°K)~4 , 

Ta=the air temperature in °K, 

c= constant, 

d= constant, 

and

ea — vapor pressure of the air in millibars.

The spectrum of water vapor is not continuous but is 

a line spectrum which obeys a square-root law of 

absorption and emission. According tc Elsasser (1942) , 

Brunt's equation will nearly approximate this relationship, but a logarithmic equation for th<^ vapor-pressure 

term would give a truer relationship. Because the 

vapor-pressure term is rather small, the choice of using 

the square-root or logarithmic relationship was considered to be of minor consequence and the square-root 

relationship was used in these studies.

The long-wave radiation data obtained in the 

evaporation studies were used to evaluate the constant 

coefficient d, in equation 1. A value of 0.0263 for d 

gave the truest results. Anderson (1954) listed nine 

investigators who determined values for d in Brunt's 

equation; their values ranged from 0.029 to 0.082. 

The value of 0.0263, used in this report, is slightly 

below this range, but the difference is not considered to 

be significant.

Most investigators have considered the c term in 

Brunt's equation to be almost constant, but some 

variation with the amount of cloud cover has been 

noted. In the course of this study, it was noted that 

correlation was better if c varied with air temperature 

and cloud cover. Continuous observations of cloud 

cover are difficult to obtain, and it was found that this 

effect could be related to the ratio of the measured
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 109

solar radiation to solar radiation received if a clear sky 

had existed for the period of study. It is easy to 

compute the clear-sky radiation for any latitude, and 

in any heat-budget study, measurements of solar 

radiation are generally made by some type of 

instrument or are available from a nearby U.S. Weather 

Bureau office. In determining the clear-sky solar 

radiation received at the earth, a solar constant of 1.6 

cal cm"2 min"1 is used.

The family of curves shown in figure 34 was drawn 

using the air temperature as the abscissa and the value

of c as the ordinate. Each curve in the series has a 

constant value of the ratio of measured solar rad; «ition 

to clear-sky radiation. These curves were drawr from 

the data taken in connection with the evaporation 

studies.

The values of c determined by nine investigators, 

as listed by Anderson (1954), ranged from 0.43 tc 0.68. 

The maximum value of c, which is indicated by figure 

2, is 0.735. If a higher value of d had been chosen, 

then the maximum value of c would have been less, 

and very close to the range listed in Anderson (1954).

Each curve is for a constant ratio of 

the measured solar radiation to 

clear-sky solar radiation

0.48

0.46

-4 -2 10 12 14 16 18 20 22 24 

AIR TEMPERATURE, IN DEGREES CENTIGRADE

BIGURE34.—Family of curves for determining the value of the c constant in Brunt's equation for atmospheric infrared radiation.

The curves of figure 2 are not adequately defined by 

data below air temperature of 10° C. A minimum 

value of c is not indicated, and consequently no 

comparison can be made with results obtained by other 

investigators.

A comparison of the computation of infrared radiation 

by Brunt's equation using values of c and d as defined in 

this study, with those obtained by measurement of radiation is shown in table 1. The average percent difference, without regard to sign, for all periods between 

computed .and measured amounts of radiation varied 

from 2.0 to 11.7 percent. The differences between the 

measurements and computations do not appear to be 

significantly related to location. More agreement is 

obtained when the computations are made for periods 

of a month or longer, than for shorter periods such as a 

week. This agreement would probably indicate- that 

the variability of the moisture content of the upper
110 STUDIES OF EVAPORATION

TABLE 1.—Computations of infrared radiation by Brunt's relationship as modified and compared with measurements of infrared radiation

Radiation station

Name

Lake Hefner: 

a.. __ . ___ ... — .-

b__-_—— ———— ————

Elevation 

above 

sea level 

(feet)

} 1,200

1,180 

8,300

770 

10,900 

30 

650 

660 

2,100 

600 

1,700

Latitude

36°03'---__

40°05'- ——

29026'—__

38°47'.- —

29°56'-____

33°20'-.-_-

32°55'---__

33°40'-.--

35°10'--___

32°41'- ——

Longitude

97°36'.-~

114°46'--- 

105°50'.--.

98°39'-.- 

105°00'--.. 

94°43'.— 

96°45'--.- 

116°55'.... 

lll'W--. 

114°35'.-.. 

116°40'- —

Period of 

radiation 

measurement

J7/50- 8/51—— 

15/58-10/58—— 

3/52- 9/53—. 

6/55-10/55, 

6/56-10/56. 

6/56-12/56—— 

6/56-10/56—— 

3/57- 8/57-— 

9/57-10/58—— 

9/57-10/59—— 

3/58- 1/60— . 

8/59-10/60—— 

11/59-10/61.—

Computation periods

Number

20 

18 

19 

10

24 

17 

31 

12

24 

21 

12 

24

Days per 

period 

(average)

6 

8 

30 

31

7 

7 

5 

30 

30 

30 

34 

30

Percent of difference 

between computed 

and measured radiation

Average

3.4 

7.1 

3.7 

4.0

3.5 

11.7 

2.9 

2.6 

3.2 

4.5 

2.0 

5.2

Maximum

14.3 

30.1 

9.3 

10.8

18.0 

21.1 

7.8 

7.1 

11.2 

11.2 

4.3 

11.9

Comparisor of average radiation 

fur all periods

Computed Measured

cal cm-2 day-1

763 

624 

715

581

712 

558 

761 

707 

665 

678 

736 

642

745 

659 

719 

603

712 

497 

754 

700 

648 

657 

741 

628

Difference 

in percent

+2.4 

-5.3 -.6 

-3.6

0 

+12.3 

+.9 

+1.0 

+2.6 

+3.2 

-.7 

+2.2

1 Solar constant of 1.7 cal cm-2 day-i was used for computing clear sky radiation.

atmosphere and cloud cover are less important for 

long periods than for short periods. Computations 

for radiation for stations at higher altitudes did not 

agree as well as those for radiation for stations at lower 

altitudes. However, no reasonable explanation of the 

effect of altitude can be offered at this time. Data 

used to determine the values in table 1 are presented 

in table 3.

Brunt's equation as modified can be used to determine the long-wave radiation received at an area if 

surface measurements are made of air temperature, 

humidity, and solar radiation. Use of periods of a 

week or longer to compute the average infrared radiation received will minimize errors caused by such atmospheric occurrences as inversions and frontal passages. 

If inversions occur frequently during any period, the 

relationship computed by Brunt's equation will be in 

error, for the actual long-wave radiation will be greater. 

The modified equation is based on data obtained where 

fog or precipitation seldom occurred. It is doubtful 

that the relationships in figure 34 would be valid under 

such circumstances.

An example is presented of the use of Brunt's equation as modified: If an area at lat 35° has the same 

representative atmospheric conditions as that measured 

at a central station, then the infrared radiation received 

for that area can be computed. Assume for this area 

that the following data were obtained for the period 

June 1 to 7:

Average temperature of the air 25° C;

Average vapor pressure of the air 16 mb;

Average measured solar radiation received 700 cal

cm"2 day"1 .

From the solar radiation chart (fig. 35), read the amount 

of solar radiation that would have been received for 

this period if no clouds had been present (827 cal 

cm"2 day"1)- The ratio of measured solar to clear-sky

radiation is then 0.85. The value of c in Brunt's equation, as determined from figure 35, is 0.72 for a temperature of 25° C and a ratio of 0.85. Tv«, right side of 

equation 1 is equal to 0.0263V16+0.72, or 0.83, and 

this value is the emissivity of the atrrosphere for the 

period. The infrared radiation from table 2 for a 

temperature of 25° C is 924 cal cm~2 day"1 for an 

emissivity of 1.00. This value, wher multiplied by 

the emissivity of 0.83, is computed to be 767 cal cm" day

TABLE 2.—Infrared radiation from a black body at temperatures 

between 0° C and 39° C

Temperature (° C)

0— _— — — — — — __ -

1_. _ . ___ — . _ -. ———

2

3—— ——— —— ——— —— —

4———— — _ — - .„. .—

6_—__— — — — __„„_ _

7

9 _ .... . _ . .. -

10—————————————

11.. __ — - ____ - _ - -

12

13———————————

14

15—————————————

16.——- — ——— ___ - -.

17—————-—— — — — 1 Q

19

Infrared 

radiation (cal cm-2 

day-i)

651

660

670

679

689

699

709

720

730

740

751

762

772

783

795

806

817

828

839

851

Temperatur-3 (° C)

20 __ . __ — —— — ——

21— __ — - . _ - __ .

22 — - ___ —— ___ -

23— ______ - ______

24- _______ . _____

25- _________ - _ - -

26———————————

27 - — __ ___ - — —

28

29————————————

30- _ _ _ - __ - —— —

31———————————

32———————————

33—-- —— — _ — ——

34————————————

35- ———— ____

36—————————— ——

37—————————————

38—————————————

39- ___ —— __ — —— -

Infrared 

radiation (cal cm-2 

day-i)

863

875

887

899

911

924

936

948

961

974

987

1000

1013

1027

1040

1054

1068

1082

1096

1109

SOLAR RADIATION REFLECTED FROM V'ATER SURFACE

If a heat budget is to be made for a body of water, 

the amount of solar radiation reflected from the water 

surface must be known. Anderson (J954) presented 

curves to determine the amount of reflected solar radiation on the basis of sun, altitude, ard cloud cover. 

Because this method is tedious and tune consuming, a 

family of curves is presented in figure 36 for determining the reflected solar radiation directly from the
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 111

900 -

800 -

>- 700 -

o 600 -

- 500 -

400 -

300

200 -^

100 -

JAN FEB MAR APR MAY JUNE JULY AUG SEPT OCT 

FIGURE 35.—Clear-sky solar-radiation chart at latitudes between 25° and 60° for all months.

NOV DEC

Clear sky if ratio - >OBO c/sc

Cloudy sky if ratio - >0.80 c/sc

300 400 500 

MEASURED SOLAR RADIATION, IN CAL CM"2 DAY

800

FIGURE 36.—A relationship to determine reflected solar radiation from measured solar radiation for clear and cloudy skies.
112 STUDIES OF EVAPORATION

measured solar radiation. There are two curves in 

this family, one for a ratio of measured to clear-sky 

solar radiation greater than 0.80 and the other for a 

ratio less than 0.80. However, either curve, if used for 

all determinations, will give results within an accuracy 

of 10 percent.

The methods presented in this report for determining 

infrared radiation from the atmosphere and reflected 

solar radiation can be used in those studies where 

adequate instrumentation cannot be maintained. 

Although the data on which the long-wave determination is based may be of uncertain accuracy, the results 

are superior to those obtained by using other relationships where a limited amount of data is available. In 

parts of the country where rain and inversions occur 

frequently, the long-wave relationship will undoubtedly give values ^that are low but still of the correct 

order of magnitude.

REFERENCES CITED

Anderson, E. R., 1954, Energy-budget studies, in Water-loss 

investigations: Lake Hefner studies, technical report: U.S. 

Geol. Survey Prof. Paper 269, p. 71-119.

Angstrom, A., 1920, Application of heat radiation measurements 

to the problem of the evaporation from lakes and the heat 

convection at their surfaces: Geografiska Annaler, v. 2, 

p. 237.

Brunt, D., 1944, Physical and dynamical meteorology: Cambridge Univ. Press, p. 105-122, 124-145.

Dunkle, R. V., and others, 1949, Nonselectfve radiometers for 

hemispherical irradiation and net radiation interchange 

measurements: California Univ. Engineering Dept., Thermal 

Radiation Proj. Rept. 9, 27 p.

Elsasser, W. M., 1942, Heat transfer by infrared radiation in the 

atmosphere: Harvard Univ. Meteorological Studies 6, Blue 

Hill Meteorological Observatory, Milton, Mass., p. 7-94.
TABLE 3

COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 115

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown

[Estimated clear-sky solar radiation: Granby, Colo., all dates computed using solar constant of 1.70 cal cm-smin-i; Pikes Peak, Colo., June, July, August, September and

October, 1956, computed using solar constant of 1.70 cal cm-* min-i] '

Day

Daily radiation 

(cal cm.-2 day-')

3 !-

CQ C3 

03 'fS

I'

»rt ^> 1-a

fcSS 

3.S 3

to o to

W

I 

I

<<

Daily 

average

$&*

.£"§ •0

8,1 elf

'•<6 S3

Daily radiation (cal cm-2 day-»)

•o 

3 js OQ C3

»1

a

"^ fc"»

+3 00

to"3 <n 

W

i

^

Daily 

average

i£ 

|1

§•82 3"

LAKE HEFNER, OKLAHOMA

1950

1.. _ ._

2.. _ ..

3..—..

4———

5... ...

6———

7 __ —

8———

9...—.

10———

11. .....

12. .....

13———

14———

15———

16———

17———

18———

19———

20———

21———

22———

23———

24———

25———

26.———

27———

28———

29———

30.. __

Ol

1.. __ _

2... .... 

3——— 

4.. . 

5.

6 ... 

7— —— 

8— —— 

9———— 

10 

11 

12———

13- __ 

14,—. 

15——— 

16— — 

17——— 

18——— 

19.. .... 

20—— 

21... ... 

22—— 

23——— 

24 ...... 

25——— 

26 

27.— - 

28 

29——— 

30———

31

July

691

657 

488

510

241

682

250 

188 

359

568

826 

826 

825

823

819

815

811 

810 

808

800 

798

740 

765 

797 

779 

772 

774 

753 

768 

819

755 

684

779 

789

737

25.4 

26.4 

26.2 

23.1 

249 

24.1 

24.6

23.8 

24.5 

21.6 

22.4 

26.3 

27.6

24.3

24.7 

23.4

22.3 

24.1

24.3

25.3 

26.3

9.1 

20.8 

21.0 

23.0 

24.0 

23.0 

23.3

24.1 

23.0

17.8 

18.7 

24.5 

24.5

21.2

24.5 

25.0

21.8 

22.5

25.8

26.2 

25.0

September

622 

511

188

608 

596

387 

293

173

377 

155

"""420" 

404 

516 

505 

487 

523 

499 

421

684 

679 

675

662 

657 

653

644 

640

628 

624 

619

610 

605 

600 

595 

590 

585 

580 

576

640 

459

658 

643 

656 

731

737

807

797 

813 

740 

679

725 

783 

700

21.7 

22.4

19.4

19.9 

20.4 

22.3 

17.5 

16.5

18.2 

17.9 

22.3 

20.7 

22.1 

23.3 

22.5 

24.7

iao

20.9 

19.5 

17.4 

17.1 

20.0 

21.5 

22.7

00 D

22.7 

23.9

I/. O

13.6 

14.5 

16.8 

144 

16.9

19.0 

18.9 

22.9 

21.2 

20.2 

20.9 

22.8 

22.6

13.9 

13.4 

14.1 

14.5 

15.3 

19.3 

20.3 

21.1 

21.5

August

444 

595 

656 

660 

557 

581 

627 

648

637 

658 

193

485

770 

768 

765 

762 

759 

756 

753 

750

736 

733

729

688

896 

847 

806 

764 

798 

811 

779 

802

767 

737 

743

602

21.1 

23.9 

23.9

24.7 

26.8 

26.6

26.0 

27.5 

28.0

24.0 

22.5 

22.3

14.7 

19.5 

23.5 

22.3 

26.3 

27.7 

26.8 

23.6

20.7 

19.9

22.8 

19.0 

19.8

26.2 

23.6 

23.3

23.0 

25.3 

24.2

24.2 

22.5 

17.8

12.9 

17.3 

21.7 

21.6 

24.8 

23.8 

23.2 

22.1

18.4 

17.0

October

472

402 

483 

356 

456

429 

410 

417

""352" 

160 

176

422 

400 

401 

345 

396 

400 

382

362

534

525 

517 

508 

499

489 

485 

480

""472" 

467 

462

453 

448 

444 

440 

435 

431 

427

414

622

UsNJ

666 

655 

610 

625 

659 

667

692

687

~~~685~

601

647 

665

21.6

16.1 

16.4 

18.6 

21.4 

20.2

21.6 

23.5 

22.4 

21.6 

21.7 

20.2 

19.7 

18.0 

17.3 

14.8 

12.1 

19.6 

16.4 

23.7 

21.2 

21.2 

21.9

00 A

22.7

19.7

8.5 

10.0 

11.2

13.5 

14.5 

14.2 

13.1 

14.0 

14.8 

13.9 

12.5 

9.5 

9.6 

10.0 

11.7 

13.0 

10.3 

9.5 

13.3 

12.6 

14.6

15.5

Day

Daily radiation (cal cm-* day-1)

Eg C§

i1

•o >>

s>M tjy

'•B-S1 

w

I 

•<

Daily 

average

$£

4* 3

.£"§

-f III -«!

Daily radiation (cal cm-2 day-i)

•o

0

it i 8

•o >> IN

"Jo'3 05 

W

a

1^

Daily 

average

1?

£ "S

<i

0,3

08 OJJ2 

> gg

.«3PfS

^4

LAKE HEFNER, OKLAHOMA— Continued 

1950— Continued

1—— —

2————

3——..

4— — .

5.——— .

7— — .

8—— ...

9——— _

10—...

11——

12......

13......

14......

15.— __

17

18

19

91

22......

OQ

24

25 

26____._

27

November

343 

165 

61 

376 

366 

340 

283 

272 

358 

357 

336 

338 

325

268 

322 

215 

239 

265 

323 

302 

304 

217 

329 

288 

295 

288 

282 

264 

271

410 

406 

402 

398 

394 

390 

386 

382 

378 

374 

371 

368 

364

358 

355 

352 

349 

346 

343 

341 

338 

335 

332 

329 

327 

324 

321 

318 

316

631 

524 

592 

488 

588 

592 

602 

608 

521 

485 

479 

516 

568

650 

551 

574 

647 

651 

547 

599 

606 

560 

463 

523 

522 

555 

547 

541 

567

17.0

3.5

4.8

11.8 

9.9

2.0 

6.3 

9.5 

16.3 

19.6 

8.4 

9.1 

142 

13.5 

1.8 

8.7

1.1 

-3.2 

5.2 

3.6 

8.0 

7.3 

7.1 

8.6

9.7

6.8 

49

8.5

4.3 

7.6 

12.8 

13.8

December

2S3 

262 

293

94 

316 

128 

289 

276

247 

233

258

171 

255

273 

259 

282 

240 

290 

67

268

314 

312 

310

307 

306 

305 

304 

303 

302 

301 

300 

299 

298 

297

294 

294

295 

295 

295 

295 

296 

296

297

607 

608 

496

526 

414 

446 

516 

546

537 

556 

551 

579

626 

633

548

580 

601 

520 

500 

501

535

14 1 

8 1 

1.7 

7.0

.3 

6 5 

4 3

3 2

&4 

3.7 

41

3.6 

1.9 

5,9 

7.2 

8.2 

8.8 

12.3 

-.7 

-4.9 -.3 

1.4

1951

1— — .

2... .... 

3——— 

4.

5—— —

6. 

7— — -

8. 

9—— ... 

10 

11 

12

1Q

14—— 

16— — 

16-—— 

17—— 

18—— 

19 _ — 

20.—— 

21.—— 

22——— 

23——— 

24——. 

25——— 

26——. 

27...— 

28——— 

29......

«>A

31———

January

320 

253 

292

276 

313 

327

324 

171 

219

325 

331 

272 

337 

340 

192 

293 

282 

304 

282 

331 

353 

152 

213 

337 

292

219

300 

302 

304

305 

306

308

311 

313 

314

320 

323 

326 

328 

331 

334 

336 

339 

342 

345 

348 

351 

354 

357 

360 

364

367

557 

570 

594

557 

473 

504 

526

559

545 

584 

626 

593 

582 

532 

491 

567 

548 

548 

575 

591 

574 

509 

441

*AQR

495

2.2 

6.2

5.5

-3.3 

-1.0 

2.9

6.8 

9.9 

12.1 

11.7 

13.6 

.6

9 R

4.6 

4.4 

2.7 

10.0

-11.6

5.0 

5.7

5.3

4.8 

4.7 

4.7 

4.1

44 

4.0 

3.7

44

February

391 

386 

348 

327 

234

379 

372 

380 

332 

37 

115 

216 

435 

372

341

437 

299 

269 

60 

459 

410 

400

370

374 

377 

381 

385

402 

406 

410 

414 

419 

423 

427 

431 

435

444

457 

461 

466 

470 

474 

479 

484

369 

426 

495 

538 

666

543 

521 

587 

632 

651 

592 

572 

577 

506 

576 

606

597

584 

694

558 

647 

629

-12.7 

-5.4 

-.5 

49

.8 

10.5 

15.3 

9.1

-5.3 -.8 

5.0

10.0 

11.3

12.9 

12.5

6.1

9.8

6.4

8.5 

9.0

10.7 

7.6
116 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (cal cm-" day-")

•o

(K w

s ° 2TM

-§£

^Ss

'•£•11 

w

o

I

s

^

Daily 

average

<3^

s ® la

.tat? •<

|S2- 

*r s a .aafi. 

•<

Daily radiation (cal cm~2 day-i)

ill

a

"O E? 

2%

I is 

«««

'S3 o

£

I 

^

Daily 

average

®? D&, a» sa

.tats •<

h *

.a IP a— • •<

LAKE HEFNER, OKLAHOMA— Continued 

1951 — Continued

1—— —

2— — .

3—— —

4. .....

5—— —

6— — .

7—— —

8————

9—— —

10......

11... ...

12......

13———

14......

15———

16———

17——

18......

19———

20......

21———

22......

23— —

24———

25- _

26......

27.———

28- ....

29......

30

Ol--____

1- _ .

2. ......

3— .... 

4—— ... 

5- _ .. 

6.. ....

7—— ... 

8—— ...

10 

11 

12 

13 

14——— 

15———

16......

17———

18.——— 

19———

20.——-.

21——— 

22———

23———

24———

25———

26———

27——— 

28——— 

29...... 

30... ...

SiMarch

447 

174 

490 

503

288 

442 

323

213 

136 

348 

560 

539 

387

340 

542

494 

577 

528 

534 

513 

562 

271

550 

612 

485

489 

494 

498 

502

512 

516 

520

530 

535 

539 

544 

549 

554

562 

566

576 

581 

585 

590 

595 

600 

604

618 

623 

628

615 

769 

613 

558 

601 

608 

550 

608

516 

476 

494 

519 

605 

600 

522 

503 

537 

526 

651 

603 

543 

595 

611 

603

585 

686

9.5 

17.8 

7.0 

6.4 

13.9 

14.2 

5.3 

3.6 

-.8

6.5

3.6 

11.6 

7.3 

1.2 

4.0 

7.4 

5.2 

17.6 

12.3 

8.2 

13.6 

12.3

9.9 

13.7

6.1

4.5 

5.8 

4.0

5.3 

5.0

5.5 

6.9 

6.8

4.2 

4.1 

5.5 

5.4 

4.5 

3.9

4.2

May

730 

727 

714 

589 

271 

693 

627

341 

720 

493

211 

375 

180 

436

618

335

654 

700

755 

758 

761 

764 

767 

769 

771

775 

777 

779

785 

787 

789 

791

797

806 

808 

810

595 

621 

624 

650 

701 

631 

665

597 

683 

661 

736

729 

786

17.9 

18.9 

18.2 

19.3 

12.3 

13.0 

17.0

15.2 

17.0 

18.8 

21.0 

20.2 

20.5

16.9 

20.2

16.9

17.4 

19.8 

18.1 

21.6 

24.8

9.6 

9.4 

9.9 

11.0 

8.5 

8.4 

12.3

11.3 

11.4 

11.9 

13.7 

20.0 

18.7

16.4 

18.8

16.3

16.2 

12.3 

14.7 

19.2 

21.5

April

133 

651

461

363

671 

681 

300 

521 

561 

682 

667 

660 

613 

581 

559 

610

524 

636 

668 

558 

410 

580 

615 

609

633

638

647

656

665 

669 

674 

678 

682 

686 

690 

694 

698 

702 

706 

710

717 

720 

724 

728 

731 

735 

738 

742

697

588 

673

679 

595 

527 

547 

636 

535 

515

598 

594 

572 

597 

665 

653 

686 

616 

626 

587 

721 

734 

692 

721 

761

6.1 

5.8 

10.6 

17.1

11.8 

8.8 

8.7 

10.5

' 7.8

15.7 

7.9 

6.9 

13.3

8.1 

13.8 

20.2 

16.1

23.0

6.3 

6.1 

6.0

6.8 

4.4 

3.9 

7.5 

5.0

4.5

4.0

5.3 

4.5 

3.6 

4.3

5.8 

7.3 

10.7 

12.0

17.0

June

564 

680 

464

726

702 

642 

672 

735 

723 

417

596 

646 

474 

722 

715 

640 

483 

239

818 

820 

821

824

827 

827 

827 

828 

828 

828

830

829 

829 

829 

828 

828 

827 

827

689 

659

744

750 

773

791

790 

847

821

812 

833 

806 

790 

810 

825 

813

24.5 

17.6 

13.7 

15.2 

18.6 

21.1 

21.9 

24.5 

21.2 

20.0 

19.3 

20.4 

22.1 

22.0 

22.5 

24.7 

25.7 

24.4 

25.7

26.1 

25.6 

24.5 

25.4 

26.9 

26.9 

26.4 

26.7 

20.2

21.0 

15.5 

12.0 

12.3 

17.0 

20.5 

18.8 

22.1 

18.5 

19.0 

19.2 

18.5 

18.9 

20.0 

19.8 

19.5 

22.9 

22.8 

22.8

24.5 

22.7 

21.2 

25.2 

22.3 

20.3 

21.7 

22.9 

18.6

Day

Daily radiation 

(cal cm-2 day-i)

•o

isna

* E? O)-X

1n"o ID W

o

S 

|

^

Daily 

average

i£

!l

.a a

•<

IL2 S-S .a as •<

Daily radiation (cal cm-2 day-i)

•o

CD

Bj I s

n3 >> &M 

ts "P

•Is "3

to V en

W

o

1^

Daily 

average

»?

£«•<

t|i .aft-S-

•<

LAKE HEFNER, OKLAHOMA— Continued 

1951— Continued

1.. __ _

2.——

4— ——

5

7.——

g

10———

19

10

14———

15——

16———

17———

18—— 

19

20——— 91

99

00

24— _

OK

26—— 97

90

OQ

DA

Q-l

July

630 

637 

461

734 

726

731

644

677 

621 

696 

689 

706 

512 

487 

670

679 

634 

572 

671 

271

826 

825 

824

822 

821

816

813

810 

808 

806 

804 

802 

800 

798 

796

792 

790 

788 

786 

784

773

826

804 

791

821

799

806 

828 

826 

823 

826 

840

822 

822

791 

823 

826

26.4 

23.1 

26.6 

26.8 

26.9 

27.5 

27.0

27.3

27.2

27.8 

25.2

25.2 

27.0 

27.6 

28.3

28.8 

30.3

24.9 

26.2

25.6

26.5 

21.5 

23.5 

22.5 

22.0 

21.6 

23.0

23.5

22.6

22.7 

24.7 

24.7 

24.3 

22.5 

23.0 

20.8

23.2 

22.0

24.2 

24.3

23.9

August

665 

679 

612 

668 

675 

663 

646 

364

664 

662 

641 

643 

648 

473 

640 

650 

188 

273 

349 

623 

612 

616 

628 

619 

622 

632 

619

78? 

77'} 

77(5 

774 

772 

770 

76P> 

765

7511 

748 

74,5 

743 

730 

73l> 

733 

72f 

72.) 

72T! 

718 

715 

711 

70' 

70? 

700 

69P 

693 

68P

830 

834 

835 

843 

853 

869 

868 

883 

825 

852

785 

787 

756 

747 

819 

838 

825 

818 

831 

798 

846 

831 

826 

829 

825 

822 

812 

793 

809

27.6 

28.4 

29.8 

29.4 

30.5 

31.8 

33.1 

30.9 

24.7 

22.2 

22.7 

26.6 

28.0 

30.6 

27.0 

25.3 

31.0

27.9 

22.3 

20.4 

24.0 

27.0 

28.2 

28.4 

29.6 

30.9 

31.2

30.4

24.0 

21.3 

20.0 

24.0 

23.7 

21.5 

17.7 

20.3 

23.8 

23.3 

22.9 

24.0 

20.5 

18.0 

19.9 

19.6 

17.7

20.2 

22.0 

19.8 

24.2 

23.4 

22.5 

21.9 

20.9 

19.3 

19.3

18.3

1958

1..——

3... — 

4.— —

5.. _ ..

6 __ -

7 

8.. _ -

9 ...— .

10——— 

11 

12. 

13 

14 

15

17

18—— 

19 — —

20 __ . 

21——— 

22... _ 

23——— 

24_—— 

25.. — — 

26. ——— 

27—— 

28——— 

29.. — - 

30—— 

31. __

May

182 

263 

657 

470 

499 

722 

716 

710 

692 

569 

489 

670 

682 

569 

510 

659 

685 

660

783 

785 

787 

789 

791 

793 

795 

797 

799 

801 

802 

803 

805 

806 

808 

810 

812 

814

773 

722 

787 

781 

762 

695 

709 

687 

712 

789 

821 

759 

795 

858 

829 

824 

788 

790

19.8 

19.6 

21.5 

20.9 

21.5 

20.4 

21.9 

22.4 

23.5 

24.6 

24.2 

23.8 

23.8 

28.4 

23.7 

25.0 25.1 ' 

27.7

19.5 

19.8 

18.6 

18.4 

18.2 

13.4 

13.4 

14.5 

15.7 

18.5 

20.7 

17.2 

17.5 

21.7 

21.6 

21.7 

22.2 

21.9

June

700 

680 

700 

717 

677 

568 

697 

699 

654 

656 

721 

628 

640 

717 

521 

287 

575 

572 

563 

263 

245 

519 

586 

682 

188 

740 

724 

718 

692 

692

815 

816 

818 

820 

821 

822 

823 

82* 

824 

825 

82P 

82P 

827 

827 

827 

82F 

828 

82F 

82P 

82P 

82T 

830 

830 

82f 

82f 

82f 

82F 

82F 

827 827

776 

852 

829 

809 

842 

872 

814 

791 

797 

814 

899 

821 

839 

806 

838 

791 

807 

775 

770 

771 

746 

718 

713 

770 

722 

628 

703 

728 

771 

755

25.2 

25.9 

27.2 

27.3 

28.2 

26.8 

27.2 

27.5 

27.9 

29.0 

29.2 

29.0 

29.0 

28.8 

26.5 

21.8 

25.2 

23.7 

26.1 

23.4 

19.6 

21.0 

22.2 

25.8 

16.7 

18.3 

22.6 

22.6 

24.4 

25.9

21.7 

22.6 

23.3 

23.5 

22.2 

24.2 

21.8 

19.7 

22.4 

24.2 

25.0 

22.8 

21.5 

20.6 

23.3 

22.9 

20.9 

22.5 

22.9 

24.2 

18.5 

17.3 

8.6 

22.1 

15.0 

11.8 

13.8 

16.9 

21.4 

23.0
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 117

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperafure and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (cal cm-2 day-1 )

•o

GO ro c'a 

S

73 >> 

<OJ4 •tJ CO

J

o3 a S~o

CO » M 

W

s8

s•<

Daily 

average

&S g-~ II •f* IL> «£? ijn-9- 

•<

Daily radiation 

(cal cm-2 day»)

« 

§ 

1| 1"

»rt t>> 

OJ.J4 

-g cp

gaa £. CD •"•* S^S o

^ 0 CO

W

1 

a

I •<

Daily 

average

I'- 

ll

£«s

•<

** H

&» — Co CG.O

.Sa £§l a^ 

•<

LAKE HEFNER, OKLAHOMA— Continued 

1958— Continued

!-_____

4.- — ..

C

Q

10

11

19

1Q

14

15

16- — - 

17-10

19

21-..-

99

OQ

24———

26-..-

97

28— ...

29

Oft

31——

1———

2— ——

3— — _

4————

5—— —

6-.._..

7— ——

8— ——

9————

10———

11———

12———

13———

14

15———

16——— 

17———

18——— 

19——— 

20——— 

21——— 

22——— 

23——— 

24- —— 

25——— 

26... .. 

27——— 

28——— 

29——— 

30—— 

31—...

July

703 

703 

661 

402 

260 

140 

484 

724 

706 

656 

685 

556 

687 

579 

514 

647 

675 

677 

691 

436 

455 

659 

665 

672 

448 

661 

602 

572 

658 

623 

610

826 

826 

825 

824 

823 

822 

821 

820 

819 

818 

817 

816 

815 

814 

813 

812 

811 

810 

808 

806 

804 

802 

800 

798 

7% 

794 

792 

790 

788 

786 

784

791 

795 

806 

808 

766 

769 

733 

728 

768 

769 

779 

807 

751 

793 

849 

816 

790 

793 

772 

755 

777 

835 

805 

771 

803 

818 

760 

790 

804 

817 

857

26.9 

27.0 

27.2 

26.7 

22.6 

20.6 

21.3 

22.0 

25.8 

27.7 

28.4 

22.0 

26.9 

27.7 

28.1 

29.0 

29.2 

29.3 

29.4 

26.2 

24.6 

25.6 

26.7 

29.0 

26.8 

26.9 

27.0 

26.4 

28.7 

30.3 

29.8

23.7 

22.8 

23.3 

22.3 

21.3 

23.0 

20.1 

19.0 

23.8 

24.8 

22.8 

23.8 

23.4 

25.0 

24.4 

25.6 

23.2 

21.7 

17.4 

22.2 

21.7 

22.2 

19.1 

24.2 

26.1 

25.3 

25.5 

25.9 

24.4 

24.3 

24.9

September

449

527 

392 

460 

209 

422 

529 

452 

153 

397 

576 

565 

147 

287 

410 

328 

276 

493 

449 

414 

533 

490 

141 

166

684

653 

648 

644 

640 

636 

632 

628 

624 

619 

614 

610 

605 

600 

595 

590 

585 

580 

576 

572 

567 

562 

557 

552

793

810 

794 

799 

726 

740 

709 

694 

730 

806 

541 

650 

786 

786 

820 

778 

820 

797 

687 

700 

620 

619 

745 

669

27.4

26.1 

25.5 

24.0 

22.0 

21.7 

22.7 

23.0 

20.8 

20.7 

16.6 

19.9 

21.4 

22.6 

22.9 

23.8 

25.8 

27.4 

24.2 

21.8 

18.6 

16.8 

18.0 

13.0

22.3

23.8 

24.8 

23.8 

22.5 

20.1 

18.8 

20.7 

21.8 

20.5 

13.0 

16.1 

22.5 

22.9 

23.7 

23.5 

26.7 

25.7 

22.4 

20.2 

10.8 

9.3 

14.8 

10.6

August

469 

652 

659 

650 

628 

609 

409 

608 

549 

610 

635 

626 

633 

624 

604 

440 

245 

596 

600 

98 

422 

565 

563 

572 

581 

609 

604 

596 

599 

596 

571

782 

779 

776 

774 

772 

770 

768 

765 

762 

759 

756 

753 

750 

748 

745 

742 

739 

736 

733 

729 

725 

722 

718 

715 

711 

707 

703 

700 

696 

692 

688

770 

809 

849 

839 

820 

775 

823 

802 

838 

845 

801 

830 

785 

812 

855 

860 

772 

781 

788 

828 

755 

717 

802 

712 

703 

724 

764 

779 

720 

746 

812

26.3 

27.8 

29.4 

28.8 

29.2 

30.0 

28.4 

26.2 

25.1 

26.5 

28.2 

30.6 

29.0 

28.2 

30.0 

28.6 

22.4 

24.7 

26.4 

24.3 

24.3 

22.4 

24.6 

23.8 

23.2 

26.6 

27.3 

29.0 

29.0 

27.2 

27.1

26.1 

24.7 

24.1 

22.5 

23.6 

23.1 

23.0 

23.7 

23.7 

24.8 

24.2 

22.7 

25.4 

26.8 

26.2 

24.9 

28.6 

22.5 

21.6 

25.8 

24.7 

20.0 

22.1 

18.5 

16.9 

18.4 

20.9 

28.8 

18.5 

20.9 

22.3

October

397 

238 

440 

454 

484 

253 

430 

454 

365 

483 

181 

743 

444 

181 

307 

437 

385 

409 

413 

395 

292 

424 

414 

345 

369 

98 

322 

293 

265 

298 

142

547 

543 

538 

534 

529 

525 

521 

517 

513 

508 

503 

499 

494 

489 

485 

480 

476 

472 

467 

462 

458 

453 

448 

444 

440 

435 

431 

427 

422 

418 

414

529 

637 

661 

641 

672 

744 

749 

745 

754 

652 

739 

684 

662 

735 

710 

583 

646 

655 

648 

690 

599 

478 

581 

664 

478 

584 

532 

467 

482 

557 

562

10.9 

13.2 

15.8 

17.6 

19.2 

20.4 

23.9 

24.3 

23.4 

16.8 

17.6 

15.6 

19.0 

19.9 

19.7 

20.1 

20.9 

20.7 

21.8 

22.7 

17.8 

15.0 

19.0 

17.5 

13.0 

9.3 

10.4 

9.1 

8.6 

10.7 

10.2

6.9 

8.3 

11.6 

14.9 

16.8 

12.7 

21.3 

21.9 

18.6 

2.8 

10.0 

11.6 

12.8 

14.1 

16.1 

15.3 

16.0 

14.7 

14.4 

16.5 

8.2 

7.6 

9.5 

10.1 

8.1 

8.1 

6.7 

7.5 

7.0 

7.7 

7.6

Day

Daily radiation (cal cm~2 day-i)

•c

§sgl ^CO

•rt >> 

«^4 

-g <«

aa-s a&s 

CO W CO w

1 

f,

^

Daily 

average

|P a?^

§ H 

*C8 <)

** H

g«l.~,

lit •<

Daily radiation (cal cm~2 day-i)

M Cu 

&

irt >> 

«M+? CO

'•si's 

w

1 

a

| ^

Daily 

average

1?0,^

S «

Is

a«•<

** H

a £§s c*— • 

•<

LAKE MEAD, ARIZONA-NEVADA

1952

1—....

2————

3.......

4————

5— ....

6.......

7————

8.......

9... ....

10......

11———

12———

13———

14———

15......

16———

17———

18......

19———

20......

21......

22———

23......

24———

25———

26——.

27———

28......

29———

30......

1 _ ....

2_.___. _

3.......

4————

5.......

6.......

7.......

8.......

9.......

10———

11......

12......

13——..

14...... 

15......

16......

17......

18...... 

19...... 

20...... 

21...... 

22...... 

23-—. 

24...... 

25— — 

26——. 

27—— 

28— — 

29...... 

30.——. 

31——

March

316 

434

497 

457 

478 

369 

185

178 

451 

489 

506 

541 

225 

455 

544 

316 

565 

498 

598 

595 

529 

503 

588 

595 

614 

581 

592 

560

489 

494 

498 

502 

507 

512 

516 

520 

525 

530 

535 

539 

544 

549 

554 

558 

562 

566 

571 

576 

581 

585 

590 

595 

600 

604 

608 

613 

618 

623

619 

599 

571 

649 

628 

638 

693

604 

637 

613 

589 

575 

601 

658 

674 

575 

609 

598 

583 

554 

536 

533 

607 

619 

608 

613 

595 

647 

691

10.9

11.5 

12.6

6.4 

9.8 

11.0 

10.0 

10.1 

9.6

12.7 

13.7 

10.2 

8.4 

8.9 

8.7 

12.5 

16.0 

15.8 

16.8 

15.2 

17.3 

20.2

8.0

5.7 

5.6

8.4 

8.7 

8.3 

5.6 

5.7 

6.5

8.5 

5.8 

3.7 

3.8 

3.3 

3.7 

6.7 

6.9 

7.7 

5.5 

7.3 

8.9 

7.9

May

714 

721 

560 

742 

751 

731 

688 

752 

749 

752 

750 

706 

766 

751 

676 

653 

755 

665 

722 

739 

766 

781 

734 

787 

716 

720 

734 

705 

796 

776 

719

752 

755 

758 

761 

764 

767 

769 

771 

773 

775 

777 

779 

781 

783 

785 

787 

789 

791 

793 

795 

797 

799 

801 

802 

803 

805 

806 

808 

810 

812 

814

704 

736 

736 

698 

686 

729 

747 

670 

707 

677 

699 

731 

760 

744 

671 

659 

649 

694 

725 

787 

712 

689 

733 

718 

749 

736 

758 

787 

791 

778 

774

20.9 

24.1 

25.2 

25.0 

25.1 

25.8 

26.0 

22.0 

22.9 

24.1 

24.5 

26.9 

29.0 

26.8 

23.2 

19.1 

22.0 

23.7 

25.3 

28.9 

24.6 

23.7 

25.2 

26.4 

27.5 

28.6 

30.2 

29.7 

31.4 

28.8 

27.8

14.7 

11.6 

10.0 

7.0 

8.0 

6.5 

10.0 

6.3 

6.6 

7.1 

9.1 

7.7 

6.2 

7.8 

8.2 

7.3 

8.2 

7.0 

7.5 

9.2 

8.1 

8.0 

8.6 

10.6 

10.6 

9.6 

7.0 

7.4 

5.5 

9.0 

8.0

April

598 

611 

638 

649 

640 

617 

656 

668 

658 

336 

529 

628 

650 

673 

701 

686 

659 

620 

660 

457 

623 

679 

688 

512 

622 

595 

181 

349 

310 

686

633 

638 

643

647 

651 

656 

660 

665 

669 

674 

678 

682 

686 

690 

694 

698 

702 

706 

710 

713 

717 

720 

724 

728 

731 

735 

738 

742 

745 

748

651 

615 

660 

662 

661 

706 

712 

684 

650 

689 

701 

696 

674 

633 

634 

654 

699 

703 

717 

724 

728 

715 

685 

704 

740 

714 

694 

557 

726 

694

18 7 

17.9 

20.0 

21.2 

20.2 

21,7 

20.8 

17.8 

17.2 

15 4 

15 8

18 5 

18 2 

20 9 

22.6 

21.7

19 1 

20.9 

20 3 

20 2 

18 8 

17.4 

14 1 

15 9 

17.1

6.0 

7.5 

5.8 

6.4 

8.8 

9.0 

8.9 

7.5 

5.2 

8.5 

7.8

5.8 

5.0 

5.5

6.5 

8.6

11.2 

10.2 

11.8 

11.6 

9.2 

13.0 

11.4 

13.0 

13.0

June

743 

632 

575 

733 

753 

773 

754 

809 

778 

790 

785 

802 

791 

784

793 

801 

780 

772 

742 

466 

757 

775 

732 

766 

733 

778 

775

815 

816 

818 

820 

821 

822 

823 

824 

824 

825 

826 

826 

827 

827 

827 

828 

828 

828 

829 

829 

829 

830 

830 

829 

829 

829 

828 

828 

827 

827

736 

782 

793 

806 

842 

806 

779 

763 

735 

763 

769 

749 

793 

768

778 

778 

809 

821 

806 

812 

800 

805 

828 

804 

821 

806 

801

26 5 

23 9 

23 9 

27.5 

30 8 

29 7 

29,0 

28.9 

27.4 

25.6 

28.0 

26.3 

28.0

29.2 

28.2

29.0 

31.3 

30.6

29.3 

28.2 

27.9 

26.2 

27.1 

28.2 

28.7 

29.0

6.3 

10.7 

14.8 

17.8 

9.2 

10.9 

8.6 

9.3 

10.9 

7.0 

10.0 

6.2 

7.5

7.0 

9.8

8.9 

9.0 

10.3 

9.4 

11.1 

8.2 

9.9 

9.3 

10.2 

9.7 

9.4
118 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation 

(cal cm-2 day1 )

•d

o>

3 H 

3°

•e !>> 

S'M

& § <S £3-3

MOM

H

'§ o

f\

| 

^

Daily 

average

£o

§ H

•hta 

^

h c

§*!;£• T-SI

£jPo5 

•<

Daily radiation 

(cal cm-2 day-1 )

•o

<B

ll 

I"

•d fj £•$

'S'Sla 

H

o

I 

I

%

Daily 

average

|g

6 ®

Is

its <j

., a> Is c?g;c

TSI ^aS

•4

LAKE MEAD, ARIZONA-NEVADA— Continued 

1952— Continued

4 _ - _

5. _ —

7.-— -

g

10

11

19

13. __ 

14 ___

15

17

19

20

91

22— — OQ

24-. ....

26 ___

97

28_____-

90

31——

2_ _ —

3————

4_. ___

5————

6 ......

7 __ .

8 __ —

9. ......

10 ___

11 __ _

12———

13.- ...

14- — .

15. ___

16- — .

17— —

18—— 

19——. 

20 ... ...

21——— 

22- — .. 

23 _ ... 

24 ......

25- — — 

26.—.. 

27—— 

28——— 

29— ... 

30——— 

31——

July

763

770 

752 

532 

646 

646 

676 

215 

647 

772 

779 

770 

780 

781 

755 

751 

742 

757 

743 

716 

725 

717 

637 

454 

636 

599 

704 

613 

529 

705 

686

826 

826 

825 

824 

823 

822 

821 

820 

819 

818 

817 

816 

815 

814 

813 

812 

811 

810 

808 

806 

804 

802 

800 

798 

796 

794 

792 

790 

788 

786 

784

800 

822 

869 

904 

907 

892 

878 

892 

848 

792 

792 

792 

792 

785 

806 

817 

807 

824 

812 

841 

853 

856 

927 

939 

925 

911

842 

827 

827

30.6 

31.7 

32.8 

34.4 

33.8 

32.8 

33.6 

32.2 

31.1 

32.7 

33.0 

32.0 

30.4 

31.2 

33.4 

33.5 

34.2 

34.0 

36.0 

34.4 

35.0 

35.4 

34.6 

30.7 

31.9 

32.9 

32.2 

31.2 

27.7 

29.2 

31.5

11.0 

9.4 

11.8 

12.8 

15.4 

17.7 

13.0 

16.5 

11.8 

11.5 

8.9 

9.2 

8.8 

10.0 

11.8 

10.4 

10.0 

11.6 

10.5 

19.0 

16.6 

15.3 

16.5 

22.4 

21.9 

22.7 

19.6 

20.0 

23.0 

21.8 

21.0

September

637 

616 

610 

545 

543 

518 

497 

623 

491 

594 

595 

573 

599 

592 

586 

490 

557 

546 

75

457 

528 

526 

517 

526 

405 

519 

515 

509 

513

684 

679 

675 

671 

666 

662 

657 

653 

648 

644 

640 

636 

632 

628 

624 

619 

614 

610 

605 

600 

595 

590 

585 

580 

576 

572 

567 

562 

557 

552

784 

814 

861 

857 

838 

850 

850 

843 

823 

776 

742 

755 

755 

794 

808 

820 

836 

823 

767

729 

747 

755 

769 

763 

720 

706 

721 

706 

691

31.3 

31.9 

34.0 

34.3 

32.5 

33.3 

32.3 

33.0 

31.9 

27.7 

21.9 

23.8 

24.9 

28.3 

27.7 

29.5 

31.3 

30.0 

25.9 

20.1 

23.0 

25.2 

26.6 

27.4 

27.2 

26.1 

27.2 

26.5 

26.8 

28.0

13.9 

16.3 

14.0 

12.7 

16.4 

13.9 

15.6 

12.9 

7.4 

6.8 

6.0 

7.0 

7.6 

8.6 

8.5 

10.8 

13.0 

15.5 

17.8 

20.4 

19.7 

17.7 

17.8 

15.6 

16.6 

16.5 

16.7 

15.2 

16.3 

13.1

August

720 

721 

710 

709 

610 

605 

655 

675 

632 

690 

703 

701 

668 

680 

677 

643 

663 

513 

624 

644 

650 

652 

656 

647 

482 

537 

653 

559 

638 

626

782 

779 

776 

774 

772 

770 

768 

765 

762 

759 

756 

753 

750 

748 

745 

742 

739 

736 

733 

729 

725 

722 

718 

715 

711 

707 

703 

700 

696 

692 

688

820 

825 

845 

864 

890 

901 

899 

908 

901 

843 

813 

835 

864 

871 

872 

864 

878 

878 

893 

899 

878 

878 

856 

865 

878 

893 

899 

883 

830 

810 

795

32.2 

33.6 

35.0 

35.5 

34.6 

34.5 

35.2 

35.8 

34.5 

34.6 

33.5 

32.0 

32.4 

33.5 

33.7 

31.7 

32.5 

33.8 

34.7 

33.5 

33.6 

33.3 

34.4 

33.2 

31.5 

31.4 

31.7 

31.1 

31.3 

33.4 

32.1

16.7 

14.8 

14.1 

15.5 

18.9 

19.3 

18.3 

17.0 

17.4 

11.9 

13.9 

13.0 

17.8 

16.5 

18.7 

19.4 

19.3 

19.8 

19.9 

16.6 

16.1 

15.4 

11.8 

14.0 

18.7 

18.0 

17.3 

17.4 

15.7 

11.6 

13.7

October

517 

511 

482 

484

498

469 

486 

485 

472 

470 

473 

470 

469 

341 

314 

434 

422 

398 

418 

428 

433 

422 

292 

416 

424 

418 

379 

336 

385

547 

543 

538 

534 

529 

525 

521 

517 

513 

508 

503 

499 

494 

489 

485 

480 

476 

472 

467 

462 

458 

453 

448 

444 

440 

435 

431 

427 

422 

418 

414

685 

676 

691 

691 

712 

698 

723 

700 

763 

743 

743 

692 

677 

663 

678 

670 

699 

692 

677 

663 

655 

619 

627 

640 

620 

620 

643 

626

650

27.3 

26.4 

26.8 

26.6 

27.0 

27.1 

26.0 

25.7 

25.8 

25.2 

25.1 

25.4 

24.7 

25.9 

23.8 

22.1 

21.8 

24.8 

24.2 

23.3 

22.5 

22.8 

22.4 

21.7 

20.7 

20.4 

20.7 

20.8 

20.1 

21.2 

22.4

15.0 

14.9 

15.7 

15.8 

14.7 

12.0 

11.8 

11.5 

11.7 

11.7

13.0 

11.1 

9.8 

10.6 

12.2 

11.1 

11.8 

12.1 

11.8 

12.7 

13.2 

13.0 

12.0 

11.8 

11.7 

13.0 

11.1 

12.5 

12.0

Day

Daily radiation 

(cal cm~2 day-1 )

•o

CD 

Sfe j! ils 3,2 -3

to » «

H

0'§3 

f\

I

<

Daily 

average

ll 

§ |j

*f <4

S| g-5^

>l% iS,t -<

Daily rad'ation 

(cal cm-2 day-1 )

ti" 

» *? S M

•O fc- $3

gSSS ^•SS

H

o

n -ai«i

Daily

average

AQ

S ®

la

.SI'S •< III 

•<

LAKE MEAD, ARIZONA-NEVADA— Continued 

1952— Continued

1.——

2.......

3———

4.———.

5—....

6— ... .

7— ... .

8————

9... — .

10———

11—...

12———

13———

14———

15......

16......

17—...

18......

19......

20......

21———

22———

23......

24......

25———

26......

27———

28———

29———

30———

31——.

November

368 

316 

364 

376 

340 

368 

153 

280 

377 

364 

332 

275 

292 

223 

89 

188 

328 

331 

333 

325 

271 

325 

115 

331 

325 

319 

321 

316 

268 

232

410 

406 

402 

398 

394 

390 

386 

382 

378 

37,4 

371 

368 

364 

361 

358 

355 

352 

349 

346 

343 

341 

338 

335 

332 

329 

327 

324 

321 

318 

316

685 

662 

663 

670 

664 

663 

698 

712 

590 

584 

620 

663 

671 

668 

628 

661 

611 

627 

619 

619 

649 

643 

633 

548 

569 

554 

547 

547 

620 

647

21.1 

20.9 

20.8 

19.6 

17.9 

17.8 

17.2 

17.1 

16.9 

13.8 

14.3 

16.9 

17.0 

15.6 

11.2 

9.6 

10.8 

12.3 

13.6 

13.0 

12.6 

10.2 

8.5 

9.2 

8.7 

8.2 

6.7 

7.0 

8.1 

10.1

11.7

6.2

7.0 

7.7 

8.2 

7.6 

8.3 

7.1 

6.3 

6.4 

6.9 

7.5 

4.4 

4.8 

3.9 

53 

4.4 

3.3 

4.5 

3.8 

5.8

December

267 

301 

285 

306 

137 

286 

194 

280 

284 

288 

289 

283 

289 

280 

284 

125 

88 

100 

163 

86 

278 

293 

301 

161 

254 

295 

275 

254 

271 

221 

271

314 

312: 

31C 

30? 

307

soe

305 

304 

80S 

302 

301 

30C 

29t 

29? 

291 296

296 

29$ 

296 

294 

294 

294 

295 

295 

295 

295 

295 

296 

296 

297 

297

642 

590 

576 

570 

647 

654 

662 

640 

613 

599 

584 

592 

642 

634 

620 

669 

677 

655 

656 

683 

569 

576 

586 

893 

606 

562 

587 

584 

576 

628 

619

9.1 

11.7 

10.5 

9.0

7.7

12.1 

11.2 

11.4 

13.1 

16.4 

14.9 

13.1 

13.2 

13.4 

12.2 

13.? 

12.7 

11.4 

9.6 

8.9 

7.0 

7.8 

8.0 

8.2 

9.2 

8.9 

10.4 

10.4

7.1 

5.3 

6.0 

6.6

6.5 

7.0

8.5 

7.8 

9.9

9.9

7.0

6.7

7.2 

8.0

1953

2.......

3..— ..

6.......

7. ......

8.— ...

9.......

10— —

11———

19

13— —

14——

15— —

16— —

17———

18—— 

19——- 

20--— 

21— — 

22— — 

23—— 

24—— 

25— — 

26...— 

27———- 

28— — 

29———- 

30——— 

31———

January

286 

266 

284 

311 

289 

77 

158 

182

265 

280 

163 

288 

313 

296 

250 

231 

238 

218 

332 

341 

340 

298 

326 

335 

374 

355 

355 

314 

359

298 

299 

300 

302 

304 

305 

306 

308 

309 

311 

313 

314 

316 

318 

320 

323 

326 

328 

331 

334 

336 

339 

342 

345 

348 

351 

354 

357 

360 

364 

367

590 

605 

597 

584 

605 

648 

668 

722 

648 

628 

613 

656 

683 

621 

576 

591 

656 

649 

640 

655 

617 

599 

598 

613 

663 

626 

576 

581 

590 

623 

605

9.9 

10.0 

10.2 

11.0 

10.0 

13.8 

14.7 

14.8 

13.4 

12.9 

12.2 

13.0 

14.0 

14.0 

12.6 

10.3 

10.0 

10.7 

11.4 

12.6 

14.3 

12.4 

12.0 

11.8 

13.8 

14.9 

13.0 

9.8 

11.1 

13.6 

14.3

8.7 

9.2 

12.5 

12.7 

12.3 

11.9 

10.7 

10.5 

5.6 

5.7 

5.2 

6.5 

7.0 

7.8 

8.5 

6.0 

5.2 

7.1 

7.8 

8.4 

7.7 

5.0 

5.5 

6.7 

6.3 

5.5

February

376 

382 

350 

379 

295 

382

213 

342 

406 

398 

401 

420 

414 

360 

437 

458 

220 

452 

472 

482 

483 

295 

344 

472 

482 

492 

454

370 

374 

377 

381 

385 

387 

392 

397 

402 

406 

410 

414 

419 

423 

427 

431 

435 

439 

444 

448 

452 

457 

461 

466 

470 

474 

479 

484

605 

605 

635 

620 

649 

670 

641 

627 

597 

576 

591 

577 

599 

613 

597 

591 

590 

566 

542 

539 

525 

518 

597 

671 

568 

576 

619 

619

10.7 

11.3 

11.8 

12.4 

13.5 

15.6 

15.6 

14.9 

11.6 

10.6 

9.0 

12.0 

11.9 

11.7 

13.0 

12.4 

11.2 

11.4 

8.1 

7.2 

7.9 

8.5 

8.9 

9.8 

9.6 

10 9 

12.6 

12.9

7.0 

6.6 

7.5 

7.5 

7.0 

8.1 

8.2 

6.0 

5.4 

4.7 

5.7 

5.8 

5.9 

6.3 

6.0 

5.6 

5.8 

4.4 

4.5 

3.3 

3.6 

3.1 

4.0 

7.2 

7.5 

5.7 

5.8 

7.0
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAE RADIATION 119

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (eal em-> day-')

•d

§ 3%

il 

s

•rt >> 5^ 

18.3

to 13 to

H

1a

a

I•<

Daily 

average

fe£ 

ai,

§g

4a« •<

IS? 1> g rt '<tj gfS

Daily radiation (eal em-2 day-i)

•d 

3 i"i

I1

•d >> <oM 

1?

2p8'o CO O M

w

1 

a

^

Daily 

average

feS"

0,2-

M ® 

-U 13

3*

|L> ""2 is4 -<

LAKE MEAD, ARIZONA-NEVADA— Continued 

1953 — Continued

1———

2————

3————

4————

5—— —

6—— —

7—— —

8—— —

9—— —

10

12———

13......

14———

15———

16———

17———

18———

19———

20———

21———

22———

23...—

24......

25———

26———

27———

28

29 

30———

31—...

1 ————

2————

3— ——

4— ——

5.— —

6...—.

7———

8————

9———

10..—.

11———

12......

13—...

14———

15......

16———

17——— 

18———

19...... 

20——— 

21——— 

22——— 

23...... 

24——. 

25——— 

26——— 

27...... 

28——. 

29——. 

30———

31 ———

March

475

514 

510 

526

521 

508 

545 

538 

514 

543 

572 

530 

565 

523

419 

554 

522

613 

548 

349 

608 

607 

442 

574 

614 

623

489 

494 

498 

502 

507 

512 

516 

520 

525 

530 

535 

539 

544 

549 

554 

558 

562 

566 

571 

576 

581 

585 

590 

595 

600 

604 

608 

613 

618 

623 

628

601 

568 

568 

620 

649 

619 

619 

641 

633 

640 

633 

640 

619 

590 

605 

634 

662 

628 

683 

676 

640 

634 

640 

691 

706 

683 

705 

712 

683 

633 

640

10.4 

8.4 

10.4 

11.1 

14.1 

13.4 

17.7 

15.0 

15.7 

16.6 

14.1 

16.0 

13.6 

12.8 

12.2 

15.6 

18.5 

16.8 

19.7 

16.6 

15.0 

15.1 

15.9 

18.6 

20.5 

18.9 

19.0 

20.3 

14.3 

14.4 

16.2

5.2 

6.5 

5.6 

5.4 

8.2 

6.3 

5.3 

7.9 

7.4 

6.2

4.9 

5.5 

5.7 

6.2 

5.0 

4.8 

6.8 

6.3 

5.7 

6.0 

7.0 

7.7 

8.4 

10.0 

8.0

May

698 

743 

766 

757 

760 

713 

782 

766 

665 

744 

609 

773 

761 

617 

676 

743 

753

491 

703

797 

785 

595 

815 

823 

740 

822 

641 

774

748

752 

755 

758 

761 

764 

767 

769 

771 

773 

776 

777 

779 

781 

783 

785 

787 

789 

791 

793 

795 

797 

799 

801 

802 

803 

805 

806 

808 

810 

812 

814

590 

598 

604 

628 

734 

698 

672 

649 

606 

638 

605 

635 

663 

741 

674 

661 

749 

735 

699 

663 

620 

677 

658 

577 

611 

632 

611 

634 

668 

691 

718

17.5 

17.8 

20.0 

21.5

20.0 

17.4 

17.7 

17.1 

19.4 

20.9 

23.0 

17.6 

18.4 

22.9 

26.7 

27.0 

25.8 

26.6 

26.3 

24.1 

19.7 

21.3 

19.7 

19.2 

16.8 

19.8 

22.6 

24.8

5.4 

5.6 

4.4 

5.2

4.3

4.8 

4.5 

4.4 

6.0 

5.6 

4.9 

7.7 

7.6 

7.6 

6.8 

7.0 

8.8 

6.0 

6.7 

6.0 

4.2 

5.0 

4.3 

4.8 

6.8 

7.2 

6.3 

6.1

April

623 

630 

620 

637 

603 

589 

677 

587 

677 

646 

707 

652 

293 

691 

695 

643 

658 

690

457 

443 

349 

690 

711 

673 

640 

185 

746 

748 

644

633 

638 

643 

647 

651 

656 

660 

665 

669 

674 

678 

682 

686 

690 

694 

698 

702 

706 

710 

713 

717 

720 

724 

728 

731 

735 

738 

742 

745 

748

677 

698 

697 

683 

597 

727 

620 

604 

607 

635 

611 

614 

681 

605 

625 

664 

670 

648 

704 

740 

778 

712 

698 

715 

720 

728 

776 

653 

620 

634

18.5 

20 5 

20.7 

21.4 

20.4 

17.5 

13.1 

11.9 

12.7 

13.8 

12.6 

13.8 

15.0 

16.2 

17.7 

16.6 

19.2 

19.8 

19.7

i9.7 

21.3 

23.0 

24.3 

25.0 

22.4 

19.6 

19.1 

18.2

6.7 

6.4 

6.5 

6.9 

7.5 

9.4 

4.4 

3.6 

3.8 

3.8 

3.6 

4.1 

4.6 

6.2 

5.1 

7.8 

5.2 

5.4 

8.4

11.3 

10.9

8.8 

9.5 

7.8 

9.8 

5.9 

6.0 

6.0

June

665 

809 

799 

734 

680 

646 

785 

800 

794 

823 

777 

670 

814 

822 

806 

710 

758 

640 

776 

791 

802 

798 

808 

814 

828 

785 

820 

810 

726 

760

815 

816 

818 

820 

821 

822 

823 

824 

824 

825 

826 

826 

827 

827 

827 

828 

828 

828 

829 

829 

829 

830 

830 

829 

829 

829 

828 

828 

827 

827

716 

641 

665 

716 

657 

739 

712 

719 

712 

716 

762 

778 

740 

742 

716 

770 

778 

727 

734 

758 

773 

793 

792 

763 

772 

754 

707 

734 

745 

784

22.5 

20.8 

24.6 

26.6 

27.0 

25.0 

24.4 

26.1 

26.4 

27.7 

28.3 

30.9 

29.5 

32.1 

31.7 

30.6 

28.6 

26.1 

27.2 

30.2 

30.8 

32.5 

33.1 

32.9 

32.2 

32.4 

29.6 

31.0 

30.8 

31.8

6.4 

6.8 

6.8 

7.8 

7.6 

10.1 

8.5 

7.9 

8.2 

7.0 

8.9 

9.3 

6.9 

5.8 

5.5 

8.1 

8.7 

8.8

EE

——

Day

Daily radiation (eal em-2 day-i)

•d

o>

l!

S

•d fj <uM 

^I"- 

I'll

w

I 

a

1

•<

Daily 

average

fe£ g,^ 

Sg 

S |3 

4(13 

•<

c3 M~m£i £§£ •<

Daily radiation 

(eal enr2 day~i)

•d 

3 £2 en n

i1

•^ £?

QjM 

I?

'•§•!! 

w

o

1!'

<i

Tally 

average

jap

S'ffl 

•SS 

•Saoa -U

IL 

|l!

LAKE MEAD, ARIZONA-NEVADA— Continued 

1953— Continued

2—.—

4— .—

7-—-

g

10————

11 

19

1Q

14——— 

15

17

10

19

on

21

23———

24—.-

OK

26- —— 97

28— —

29

Qfk

1_—— .

2— —-

3————

4—....

5

6—— -

7-— —

8——.:

10———

11— —

12......

13......

14———

16———

16———

17——— 

18—— 

19——— 

20——— 

21——— 

22——.. 

23———

24———

25——— 

26——— 

27— — 

28— — 

29—... 

30— — 

31———

July

800 

800 

715 

344 

705 

689 

726 

551 

631 

737 

710 

707 

733 

461 

709 

301 

283 

688 

710 

691 

682 

677 

691 

722 

717 

706 

695 

680 

484 

358 

382

826 

826 

825 

824 

823 

822 

821 

820 

819 

818 

817 

816 

815 

814 

813 

812 

811 

810 

808 

806 

804 

802 

800 

798 

796 

794 

792 

790 

788 

786 

784

741 

749 

835 

835 

792 

827 

850 

899 

878 

857 

899 

864 

914 

886 

850 

871 

850

878 

869 

878 

871 

893 

885 

892 

893 

907 

913 

911 

885

33.3 

31.6 

34.6 

34.0 

33.4 

33.7 

34.0 

33.9

30.4 

29.9 

29.7 

31.0 

33.6 

34.9 

35.1 

36.2 

37.7 

35.6 

35.3

34.8 

31.3 

31.6

9.2 

9.3 

9.5 

12.3 

14.1 

13.3 

15.2 

15.0

23.7 

23.4 

22.4 

20.0 

17.5 

17.8 

20.0 

17.1 

16.3 

19.4 

19.8

19.3 

19.8 

19.6

September

640 

642 

637 

644 

621 

631 

554 

535 

571 

592 

608 

593 

574 

575 

562 

559 

529 

559 

566 

549 

550 

563 

576

563 

521 

534 

624 

522 

516

684 

679 

675 

671 

666 

662 

657 

653 

648 

644 

640 

636 

632 

628 

624 

619 

614 

610 

605 

600 

595 

690 

585

676 

572 

567 

562 

557 

552

720 

741

758 

779 

788 

788 

808

836 

776 

757 

780 

800 

763 

780 

782 

779 

790 

771 

767 

770 

697 

662

740 

699 

742 

689 

772

27.7

30.5 

31.1 

32.5 

31.6 

31.7 

31.4 

32.0 

31.7 

30.7

32.7 

32.6 

32.4 

32.5 

32.9 

31.7 

31.0 

31.1 

30.3 

28.2

30.4 

29.5 

29.1 

28.2 

27.2 

29.1

11.6

12.3 

16.5 

14.6 

13.7 

14.4 

15.6 

15.0 

16.5 

14.0

13.9

11.8

11.2 

12.6 

9.8 

11.8 

14.5 

12.9

August

495 

742 

751 

745 

752 

691 

644 

541 

595 

611 

656 

560 

546 

570 

527 

665 

703 

706 

676 

659 

682 

681 

658 

659 

612 

305 

594 

680 

658 

653 

648

782 

779 

776 

774 

772 

770 

768 

765 

762 

759 

756 

753 

750 

748 

745 

742 

739 

736 

733 

729 

725 

722 

718 

715 

711 

707 

703 

700 

696 

692 

688

883

778 

741 

726

868 

872 

870 

830 

838 

790 

779 

785 

825 

880 

855 

800 

839 

833 

872 

848 

831 

752 

772 

724 

721

32.1 

33. S 

32.5 

30. P 

31. S 

32. S 

34.4 

35.3 

33.4 

34.2 

34.5 

34.1 

33. S 

33.2 

32.7 

32. E 

33.fi 

34. C 

34.3 

36.4 

35.3 

32.8

34.3 

32.3 

28.3 

29.3 

31.2 

29.0 

27.4 

27.1

17.6 

11.0 

9.7 

11.4 

9.5 

12.8 

17.3 

18.0 

18.9 

18.6 

17.6 

17.3 

16.5 

16.5 

16.8 

16.7 

12.7 

11.0 

13.5 

17.0 

15.6 

11.1

14.5 

18.1 

23.2 

22.3 

10.0 

11.8 

10.4 

10.0

709-500 O - 64 - 2
120 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation 

(cal cm-2 day1 )

•o

<L>

co 03

I1

10 E? 

|^

"S"o to

w

o

I

8

| 

^

Daily 

average

SE

Ii

* 3 

•<

Sfa

2 I -2 

i&I <!

Daily radiation (cal cm-2 day-')

•o

B (H

§

rt S oM

irt >v 

vM ts"P

S *-l *H S os os •S^o

CO O CO

w

o'£

a

P,

o

^

Daily 

average

6?Q,^, a® Is

it^ •<

liEl!

3

GRANBY, COLO.

1955

1— .-.-

3— ....

4— ....

5.......

6.......

T. ......

8— ——

9— ....

10——

11———

12......

13— —

14.———

15......

16— —

17— —

18——

19.———

20——

21— ...

22——

23......

24-. ...

25......

26——

27— —

28— —

29- _ .

30— —

31.———

1— ——

2— — . 

3————

4— — . 

5— .... 

6————

7— — .

9——.. 

10

11

10

14

17.——— 

18——— 

19—... 

20——— 

21—.,.

22———

23.———

24.. _ .

25———

26——— 

27——. 

28——— 

29...... 

30— — 

31——.

July

645 

874 

859 

850 

679 

485 

680 

860 

791 

652 

675 

840 

787 

709 

583 

519 

387 

391 

461 

457 

378 

404 

682 

693 

629 

442

872 

871 

870 

869 

868 

867 

866 

865 

864 

862 

858 

855 

853 

852 

850 

848 

846 

844 

842 

840 

837 

835 

832 

831 

827 

824

632

509 

562 

570 

645 

671 

644 

591 

619 

623 

612 

542 

583 

626 

672 

683 

694 

711 

706 

697 

775 

721 

731 

674 

693 

706

16.1 

13.3 

14.4 

16.1 

17.8 

13.9 

13.6 

16.1 

17.5 

14.4 

13.3 

16.4 

16.1 

15.0 

14.7 

13.3 

14.4 

15.3 

16.4 

15.6 

14.7 

14.4 

15.6 

17.2 

16.1 

16.4

8.2 

4.2 

6.9 

8.6 

14.3 

9.3 

6.0 

7.6 

11.3 

14.0 

5.8 

7.7 

7.6 

10.5 

10.5 

11.0 

12.0 

11.7 

12.4 

13.3 

14.4 

13.5 

12.5 

11.6 

10.8 

11.9

September

692 

662 

671 

658 

590 

437 

418 

580 

395 

635 

617 

571 

488 

598 

495 

616 

238 

484 

402 

401

410 

575 

565 

551 

547

702 

697 

692 

688 

684 

678 

673 

668 

663 

657 

652 

647 

641 

636 

631 

625 

620 

615 

610 

604

573 

567 

562 

557 

551

589 

546 

570 

602 

624 

595 

628 

613 

599 

553 

545 

609 

630 

608 

611 

573 

599 

644 

616 

615

600 

596 

620 

629 

627

13.3

11.7 

12.2 

12.8 

11.7 

10.8 

14.7 

11.7 

12.2 

9.4 

9.2 

10.6 

12.8 

11.7 

11.1 

11.1 

9.4 

10.6 

10.6 

6.4 

7.2 

7.2 

7.8 

7.8 

7.8 

6.1 

7.2 

10.3 

10.6 

9.2

8.2 

6.7 

7.8 

9.2 

8.3 

8.6 

10.7 

8.3 

8.1 

6.7 

6. 3 

6.7 

8.1 

8.6 

7.8 

7.3 

9.2 

8.6 

11.0 

8.4 

8.4 

8.0 

8.6 

9.2 

9.2 

8.0 

8.6 

9.7 

9.9 

9.2

August

518 

537 

619 

563 

411 

384 

586 

601 

616 

683 

397 

469 

587 

328 

590 

599 

360 

£81 

408 

672 

726 

619 

475 

523 

509 

555 

425 

574 

660 

701 

694

820 

817 

814 

811 

808 

805 

801 

798 

795 

791 

787 

782 

780 

776 

773 

769 

764 

761 

757 

753 

749 

745 

742 

738 

734 

729 

725 

721 

717 

711 

707

725 

702 

688 

710 

713 

683 

685 

682 

643 

658 

637 

678 

701 

695 

665 

666 

711 

742 

691 

696 

651 

666 

651 

654 

724 

739 

688 

691 

592 

557 

583

16.7 

14.4 

15.6 

14.7 

15.0 

13.3 

14.7 

14.7 

15.3 

14.4 

13.0 

14.2 

13.6 

14.4 

12.8 

14.4 

13.0 

14.2 

13.6 

16.1 

16.4 

18.6 

13.3 

14.7 

15.6 

16.1 

13.3 

13.9 

11.7 

11.1 

13.0

12.6 

12.3 

12.4 

13.0 

13.0 

11.7 

11.7 

11.2 

11.0 

10.9 

9.4 

10.2 

11.3 

14.4 

9.7 

11.7 

12.6 

12.8 

13.0 

12.1 

11.0 

8.6 

10.0 

12.3 

12.9 

13.1 

12.5 

11.0 

8.6 

7.8 

8.4

October

541 

457 

536 

480 

391 

416 

521 

511 

514 

500 

435 

486 

483 

488 

476 

466 

470 

455 

383 

295 

387 

429 

355 

425 

428 

403 

149 

115 

322 

260 

141

546 

541 

535 

530 

525 

519 

514 

509 

504 

498 

493 

489 

483 

478 

473 

467 

463 

458 

453 

447 

442 

438 

432 

427 

423 

418 

412 

407 

403 

399 

394

642 

710 

637 

536 

584 

446 

432 

436 

449 

487 

559 

479 

467 

558 

490 

475 

483 

485 

522 

594 

586 

556 

488 

525 

486 

461 

575 

572 

563 

539 

566

8.9 

10.0 

10.0 

6.1 

5.0 -.6 

2.2 

4.4 

5.0 

6.7 

8.9 

5.6 

3.9 

4.4 

5.6 

5.3 

3.9 

5.0 

4.4 

3.9 

7.2 

7.2 -.6 

3.9 

-1.1 

0 

-2.2 

-3.9 

-3.3 

.3 -2.2

9.2 

10.2 

10.2 

8.3 

7.2 

4.3 

5.7 

6.5 

6.8 

7.7 

9.3 

12.0 

6.5 

6.7 

7.2 

7.4 

4.7 

5.4 

5.3 

6.5 

6.1 

6.4 

4.2 

6.0 

3.4 

4.5 

4.4 

3.8 

3.7 

4.8 

4.4

Day

Daily radiation (cal cm-2 day-1 )

•o

CD

5 jjl CQ TO 

CO r2

I*

•o fr -S-S

|cic3 3 .3 "3

"£ 0 W 

W

o'§3

•a

!•<

Daily 

average

&? ft— - a® la

.fa 08 •«!

Nl .fa at •«!

Daily radiation 

(cal cmr2 day1 )

•o

<L> 

CO TO I1

3£

.a p*oj'jj •g'S m 

W

•g

I

8

S

<

Daily 

average

S£

So, z%.fa 08 <!

*! p,S

SlI .fa as ^

GRANBY, COLO.— Continued

1956

1————

3— — -

4—— — 5— — -

7—— ...

8— — -

9— — -

10— —

11— —

12— —

13— —

14———

15——.

18— —

19

20— —

21———

22———

24.—— OC

26..—-

27.——— OO

30— —

31— —

1———— 

2— — - 

3— — .

4———— 

5— .—

6——— -

7— ——

8—— —

9—— —

10— —

11— —

12— —

13— —

14— —

15— —

16— —

17— — 

18— — 

19— — 

20— — 

21——— 

22.. .... 

23——— 

24——— 

25- —— 

26——— 

27— — 

28——. 

29——— 

30— — 

31 ———

May

400 

788 

672 

468 

554 

560 

427 

518 

558 

643 

493 

314 

662 

847 

794 

791

829 

831 

833 

835 

837 

840 

842 

844 

846 

848 

850 

852 

854 

856 

859 

861

506 

577 

622 

630 

628 

621 

633 

611 

580 

589 

588 

599 

545 

574 

602

7.5 

9.7 

11.4 

12.5 

12.8 

10.0 

10.0 

10.0 

11.4 

10.6 

10.0 

8.6 

10.0 

11.1 

11.1 

13.3

4.6 

5.3 

6.0 

6.6 

6.7 

8.9 

10.2 

9.5 

9.3 

8.1 

8.4 

8.2 

5.6 

6.8 

7.3 

8.0

July

724 

690 

822 

866 

858 

734 

845 

823 

751 

498 

490 

365 

557 

504 

747 

820 

755 

644 

793 

771 

590 

230 

681 

785 

660 

602 

620 

581 

452 

408 

338

878 

877 

876 

875 

873 

872 

871 

870 

869 

868 

867 

866 

865 

864 

862 

858 

855 

853 

852 

850 

848 

846 

844 

842 

840 

837 

835 

832 

831 

827 

824

665 

643 

595 

583 

584 

631 

570 

712 

586 

621 

638 

658 

652 

670 

790 

598 

612 

587 

649 

641 

619 

620 

626 

635 

654 

647 

659 

634 

661 

666 

669

12.8 

12.2 

12.8 

13.3 

15.0 

16.4 

14.4 

16.1 

16.7 

15.0 

12.8 

11.7 

11.7 

12.8 

14.7 

15.0 

15.6 

15.0 

14.4 

14.4 

15.6 

10.8 

13.3 

16.1 

16.1 

15.0 

15.6 

15.8 

15.6 

13.9 

12.2

10.0 

10.3 

8.4 

8.0 

8.2 

8.6 

8.0 

8.0 

8.8 

8.5 

9.8 

9 9 

9.7 

10.8 

9 2 

7. 6 

8.2 

8.0 

10.2 

8.2 

8.5 

10.0 

9.6 

9.6 

9.9 

10.8 

10.9 

10.2 

10.0 

12.1 

11.8

June

594 

683 

776 

462 

515 

748 

846 

742 

592 

797 

809 

836 

769 

679 

707 

847 

628 

809 

635 

514 

846 

848 

800 

830 

608 

847 

844 

628 

583 

330

863 

86B 

867 

870 

870 

871 

872 

873 

875 

876 

877 

878 

879 

879 

880 

880 

880 

881 

881 

881 

882 

882 

882 

882 

881 

881 

880 

88G 

879 

879

641 

591 

604 

608 

643 

598 

560 

655 

630 

612 

612 

602 

695 

611 

581 

561 

601 

634 

599 

613 

602 

556 

589 

596 

589 

606 

623 

722 

729 

663

12.8 

12.8 

13.6 

10.6 

10.3 

10.0 

12.5 

14.7 

13.0 

14.2 

15.6 

15.0 

14.4 

15.6 

16.1 

12.8 

13.3 

15.0 

14.4 

12.0 

11.7 

11.4 

12.5 

15.0 

14.4 

14.7 

15.6 

15.6 

15.0 

11.7

8.7 

6.9 

6.5 

7.6 

8.4 

6.3 

7.5 

7.6 

8.6 

9.0 

6.8 

7.4 

7.6 

9.7 

7.2 

5.8 

7.7 

8.0 

8.6 

8.2 

7.0 

6.1 

7.0 

8.0 

7.5 

8.0

as

10.0 

9.7 

10.6

August

334

775 

703 

738 

764 

778 

727 

629 

501 

652 

518 

550 

481 

305 

595 

378 

689 

522 

499 

544 

363 

524 

457 

685 

548 

582 

430 

691

820

808 

805 

801 

798 

795 

791 

787 

782 

780 

776 

773 

769 

764 

761 

757 

753 

749 

7«5 

742 

738 

734 

729 

725 

721 

717 

711 

707

695

581 

638 

616 

554 

579 

577 

650 

663 

697 

687 

662 

697 

680 

680 

649 

602 

613 

595 

607 

596 

600 

631 

591 

564 

558 

584 

548

13.6 

13.9 

12.8 

13.0 

12.5 

13.3 

13.9 

12.8 

14.2 

13.6 

14.4 

13.9 

14.4 

16.7 

15.6 

13.3 

12.8 

12.2 

12.2 

12.8 

11.1 

11.1 

11.7 

11.7 

12.0 

12.0 

12.8 

11.1 

11.4 

11.4 

7.2

11.8 

10.3 

7.8 

6.7 

6.6 

8.6 

7.7 

6.5 

7.3 

6.4 

8.6 

10.3 

9.2 

10.7 

12.8 

12.8 

12.2 

10.5 

12.1 

10.0 

9.6 

9.5 

8.7 

9.0 

9 2

g!o

8.5 

7.2 

7.5 

6.4 

5.7
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 121

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Dally radiation (cal cm-* day-i)

•a

1| 1"

•3 &

®,y

-w to 

2 >-< H

ll!

w

1

s %

Daily 

average

s?&—

£"8 !i

<!

|t~w 00.^ 

> «>*

Ji&l 

«i

Daily radiation (cal cm-2 day-1 )

•a

S"

h<n ®

•O !>>

S3g&b 1-11

H

1

A

a

I

^

Daily 

average

£p

-w 3 

ja« 

o

ILl ®

Iff 

i&£ •«!

GRANBY, COLO.— Continued 

1956— Continued

1... ....

3— — _

4—— —

5— — —

6— — .

7— — -

8— ... .

9— — .

10——

11——

12———

13———

14. .... .

15......

16—...

17— —

18———

19—...

20———

21——.

22-.-.

23———

24— ...

25—...

26———

27———

28———

29———

30———

31———

September

694 

603 

481 

577 

690 

670 

517 

565 

419 

564 

621 

610 

538 

623 

631 

556 

616 

613 

599 

580 

269 

553 

595 

579 

579 

570 

414 

382 

532 

496

702 

697 

692 

688 

684 

678 

673 

668 

663 

657 

652 

647 

641 

636 

631 

625 

620 

615 

610 

604 

599 

595 

589 

584 

579 

573 

567 

562 

557 

551

523 

557 

626 

586 

479 

486 

573 

592 

622 

.580 

654 

618 

607 

583 

518 

535 

543 

538 

560 

615 

628 

559 

493 

514 

514 

538 

627 

638 

605 

554

8.9 

11.1 

13.3 

13.6 

8.9 

8.9 

10.0 

10.0 

11.1 

12.8 

14.2 

15.6 

13.3 

12.8 

10.6 

8.9 

9.4 

10.6 

11.1 

11.7 

9.4 

8.6 

6.1 

7.2 

7.8 

8.3 

10.0 

10.6 

10.3 

7.2

6.3 

6.9 

8.2 

9.3 

8.4 

6.6 

6.4 

8.7 

9.6 

9.0 

9.0 

8.8 

7.4 

6.4 

5.0 

4.3 

5.2 

4.8 

6.2 

5.3 

7.5 

5.6 

4.1 

4.5 

4.0 

4.8 

5.2 

6.8 

5.8 

6.4

October

532 

506 

445 

503 

299 

493 

401 

173 

391 

486 

460 

358 

430 

449 

467 

469 

404 

458 

307 

457 

449 

372 

260 

116

392

546 

541 

535 

530 

525 

519 

514 

509 

504 

498 

493 

489 

483 

478 

473 

467 

463 

458 

453 

447 

442 

438 

432 

427

412

625 

543 

530 

586 

565 

551 

574 

616 

584 

. 526 

561 

544 

550 

491 

496 

491 

488 

504 

508 

478 

460 

500 

557 

599

482

8.9 

6.1 

6.7 

7.2 

7.8 

7.8 

7.2 

7.2 

7.8 

5.8 

6.4 

5.3 

2.8 

2.2 

2.8 

3.6 

3.3 

3.3 

0 

-.6 

1.7 

2.5 

5.3 

1.1 

-2.8 

2.0 

2.0 

1.1 

-2.0 

-2.2 

-1.1

6.6 

5.5 

5.5 

5.6 

6.6 

5.7 

5.8 

6.7 

6.4 

5.3 

4.7 

5.1 

4.7 

4.8 

4.6 

4.6 

3.6 

4.3 

3.7 

3.5 

3.3 

3.2 

4.5 

5.3 

2.7 

4.3 

4.6 

3.7 

3.5 

2.8 

3.3

ESSAR RANCH LAKE, SAN ANTONIO, TEX.

1956

1.. .....

2—— — 

3—— ...

4——.. 

5— ——

6— —— 

7.......

8— .... 

9— .... 

10———

11———

12———

13.... ..

14——.

15......

16———.

17— —

18———

19———

20———

21 — ..

22——— 

23——— 

24- __ 

25——. 

26———

27——.. 

28——. 

29—... 

30— — qi

June

776 

704 

646 

675 

678 

733 

746 

747 

752

817 

817 

817 

817 

817 

816 

816 

816 

816

876 

859 

854 

828 

839 

841 

841 

801 

755

29.5 

28.0 

29.0 

27.8 

27.5 

28.8 

30.0 

29.2 

27.0

22.6 

23.5 

22.9 

20.5 

20.6 

20.8 

20.1 

18.5 

19.3

July

647 

529 

523 

602 

749 

758 

759 

754 

732 

652 

713 

694 

709 

716 

724

.. -..

816 

815 

815 

815 

814 

814 

813 

813 

812 

812 

811 

810 

809 

808 

807

858 

899 

858 

893 

843 

799 

814 

828 

819 

830 

828 

794 

811 

797 

779

27.8 

28.0 

26.5 

28.5 

28.8 

29.0 

29.2 

29.5 

28.2 

27.0 

27.8 

27.5 

28.2 

28.5 

29.0

23.0 

22.8 

23.0 

23.3 

20.2 

18.6 

19.5 

21.0 

22.3 

23.5 

23.0 

23.9 

22.8 

20.0 

21.7

Day

Daily radiation (cal cm-s day-i)

•d 

3 b tn 03

I 8

>rt ^>

1? 

d£§ •S.S'o

GO « 10

w

0

1

3

Daily 

average

feO8°^

.ti « 

o

f$&> g g

'•<6&S 

Daily radiation (cal cm-* day-i)

•a SM

* s

8

•rj >> 

&J4

life 

"S u to w

«

1

1 

^

IMly 

average

|pa"®

•23 5s

b *

lit .6 &s <!

ESSAR RANCH LAKE, SAN ANTONIO, TEX.— Continued 

195ft— Continued

1— . —

2.......

3— .—

4— — .

8—— —

6—— ...

7— — .

8—. —

9—— —

10———

11———

12———

13......

14———

IS— -.

16———

17———

18———

19——

20— —

21———

22— —

23———

24———

25— ...

26— —

27———

28——

29———

30— —

31

1— ——

2—— ... 

3— —— 

4— .... 

5———— 

6— — .

7— — . 

8— — . 

9—. — 

10 

11

14— — 

15

16———

17- 

18——— 

19... ... 

20— — 

21——. 

22— — 

23—... 

24- — .

oe

26— — 

27— — 

28...... 

29— ... 

SO——- 

SI-—.

August

616 

671 

707 

719 

667 

665 

679 

706 

710

783 

782 

780 

778 

776 

774 

772 

770 

768

811

794 

803 

797 

834 

833 

832 

811 

785

27.5 

27.8 

28.8 

29.8 

29.5 

29.2 

29.5 

29.2 

29.2

19.6 

20.0 

18.8 

17.0 

19.4 

21.6 

21.5 

21.7 

21.7

October

427 

412 

387 

388 

236 

475 

424 

156 

487 

373 

527 

517 

509 

385 

288 

• 496 

413 

326 

405 

371 

488

562 

558 

554 

550 

546 

543 

539 

535 

531 

527 

524 

521 

517 

513 

509 

505 

500 

496 

492 

488 

484

726 

778 

801 

796 

761 

758 

614 

762 

773 

738 

666 

60S 

625 

686 

766 

671 

726 

805 

793 

705 

571

21. 7 

23.0 

23.7 

23.7 

21.0 

21.3 

20.5 

20.0 

22.1 

21.7 

20.0 

18.9 

18.5 

20.5 

21.5 

19.4 

19.8 

23.0 

24.1 

19.9 

17.4

i6.2 

20.6 

22.5 

20.3 

21.1 

18.9 

18.4 

20.1 

19.4 

18.1 

9.9 

8.1 

9.7 

16.0 

16.0 

6.0 

9.6 

18.0 

21.7 

10.7 

7.2

September

619 

625 

611 

575 

626 

631 

612 

617 

592 

617 

614

681 

677 

674 

670 

666 

662 

658 

653 

650 

646 

642

720 

706 

724 

736 

738 

712 

702 

695 

739 

716 

701

25.5 

23.5 

25.8 

26.2 

26.5 

26.0 

25.5 

25.8 

27.5 

28.2 

28.5

14.3 

17.5 

21.7 

22.6 

20.8 

21.2 

20.9 

19.2 

16.1 

14.5 

16.9

December

389 

388 

369 

184 

191 

.150 

132 

226 

245 

355 

330 

295 

357 

359 

354 

211 

160 

68

355 

383 

381 

353 

382 

384

395 

393 

391 

389 

387 

386 

384 

382 

380 

379 

378 

377 

376 

375 

374 

374 

374 

374

373 

373 

374 

374 

374 

374

539 

539 

571 

697 

746 

778 

811 

739 

572 

527 

598 

701 

511 

503 

559 

658 

769 

646

506 

478 

508 

551 

532 

530

14.7 

15.4 

16. f 

19.4 

20.9 

23.4 

24. T 

19.7 

6.0 

8. 2 

15.1 

19.? 

9.f 

7.P 

11.1 

11. * 

22. f 

12.2

10.4 

12.7 

12.? 

15.7 

14. e

6.5 

4.3 

14.0

22.0 

22.0

2.7

6.2 

5.7

4.6 

3.6 

6.0 

4.3 

5.4
122 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation 

(cal cm.-2 day-1)

-o

§

J| §"o

*rt »*»

•s uMTM

g§§ 131

w

o

I

8

1 ^

Daily 

average

feS'

ft29 is ~<

It ra tn£i Teg £ft£ •<

Daily radiation 

(cal cm.-2 day-')

-o

§a |!

-o b 1*

$""

0

"ft 

1-4-a «J

Daily 

average

&V ft^--

.£3 03 

<1

t* !O

<s S2 

> S n 

fc) Si-5 

<

PIKES PEAK, COLORADO

1956

1. .... 

2———— 

3...——

5... 

6————

7...— _

8— — .

9— ——

10——

11... _

12 

13.-—

14 

15 

16 

17 

18 

19 

20 

21 

22 

23———

25 

26

27 

28— ___ 

29 

30 

31———

1—— ...

2.... ..

3————

4... .

5.......

6———

7...— .

8_.

9- __ .

10.. _ -

11———

12.. .

13———

14..

15—— _

16- _ _ 

17——. 

18——— 

19—— _ 

20——— 

21——— 

22——— 

23——— 

24——— 

25—— _ 

26—— _ 

27——— 

28- _ . 

29 _ — 

SCSI———

June

730 

859 

698 

482 

617 

638 

858 

853 

529

700 

588 

763 

219

611 

.448

880 

880 

880 

881 

881 

881 

881 

881 

880

880 

879 

878 

877

875 

873

504 

475 

504 

576 

533 

518 

562 

518 

547

490 

518 

547 

576

518 

518

10.9 

11.6 

8.7 

11.9 

10.5 

12.6 

11.8 

9.7 

10.9

10.8 

11.5 

9.2 

9.1

8.0 

8.8

8.6 

3.0 

7.3 

6.4 

6.1 

4.6 

4.0 

5.6 

3.9

4. 3 

4.2 

6.2

5.6

7.7 

6.8

August

258 

287 

629 

731 

769 

660 

552 

437 

594 

629 

471 

423 

337 

527 

629 

358 

368 

266 

208 

458 

584 

499 

469 

404 

346 

441 

713 

426 

401 

620 

548

807 

805 

801 

799 

796 

793 

791 

788 

785 

782 

779 

776 

773 

770 

766 

763 

749 

757 

754 

766 

747 

744 

740 

737 

732 

728 

725 

721 

717 

717 

708

619 

533 

504 

475 

461 

490 

504 

475 

520 

484 

528 

567 

541 

569 

539 

547 

518 

536 

546 

481 

445 

461 

504 

461 

480 

460 

446 

475 

484 

505 

438

8.3 

7.4 

9.0 

9.3 

11.1 

11.2 

10.9 

9.5 

11.1 

10.4 

9.3 

9.6 

8.9 

10.4 

11.9 

9.3 

8.3 

5.5 

3.6 

4.9 

6.5 

7.6 

9.3 

7.8 

7.3 

7.6 

9.1 

7.4 

5.9 

8.3 

3.0

8.9 

8.4 

6.8 

5.8 

4.5 

5.1 

5.9 

4.5 

7.8 

6.1 

7.6 

7.5 

8.0 

7.5 

7.3 

8.2 

8.3 

7.4 

7.7 

7.2 

5.2 

5.6 

5.1 

5.7 

5.7 

5.7 

4.0 

4T8 

5.6 

3.7 

5.6

July

408 

458

772 

827 

626 

811 

521 

294 

554 

473 

315 

395 

386 

599 

418 

405 

446 

353 

712 

643 

322 

734 

529 

349 

575 

652 

593 

625 

273 

337

872 

871

869 

867 

865 

863 

861 

859 

856 

854 

852 

850 

848 

846 

844 

842 

840 

837 

835 

833 

831 

829 

827 

825 

823 

819 

817 

814 

812 

810

590 

518

504 

547 

533 

504 

576 

490 

479 

483 

515 

503 

525 

479 

514 

484 

518 

485 

490 

504 

526 

490 

475 

490 

490 

490 

533 

547 

576 

634

6.4

7.8

8.3 

11.4 

11.9 

12.7 

9.6 

8.4 

10.8 

10.8 

8.6 

7.6 

8.8 

10.0 

7.0 

7.5 

9.1 

5.9 

8.0 

10.6 

7.4 

9.4 

9.9 

10.8 

11.3 

11.6 

10.8 

10.7 

8.2 

7.4

6.9 

7.4

7.7 

4.1 

3.6 

2.0 

7.0 

7.9 

5.6 

5.4 

7.3 

7.7 

7.7 

7.1 

8.5 

8.9 

7.8 

8.4 

6.7 

5.3 

7.8 

5.9 

6.2 

6.0 

6.0 

6.0 

7.2 

7.9 

8.6 

8.6

September

709 

680 

614 

683 

689 

689 

547 

355 

491 

583 

587 

608 

505 

563 

661 

628 

640 

633 

595 

611 

347 

391 

617 

613 

466 

391 

550 

509 

577 

468

704 

700 

695 

691 

687 

683 

677 

673 

669 

664 

659 

654 

650 

644 

639 

634 

629 

623 

618 

613 

607 

602 

597 

591 

586 

581 

576 

570 

565 

560

419 

455 

467 

441 

508 

459 

467 

490 

507 

504 

490 

477 

523 

458 

422 

439 

452 

439 

452 

459 

443 

527 

560 

.426 

449 

432 

446 

446 

403 

446

8.1 

9.6 

8.2 

10.3 

7.0 

7.3 

8.5 

8.3 

9.1 

10.3 

11.4 

12.0 

11.7 

11.1 

10.5 

9.4 

7.3 

9.8 

8.7 

10.5 

5.2 

3.4 

3.7 

7.1 

6.0 

6.1 

8.3 

7.3 

5.2 

6.6

3.1 

3.7 

2.8 

4.5 

5.6 

5.2 

4.0 

4.8 

5.6 

5.5 

5.0 

3.9 

4.2 

3.8 

2.7 

2.6 

5.2 

3.0 

4.3 

3.1 

47 

6.0 

5.6 

3.0 

3.5 

5.0 

3.1 

4.0 

4.5 

4.3

Day

Daily radiation 

(cal cm.-2 day-1)

13

<u 

3 !3

I*

'g.M

fl} r±3 +j w

s-si

w

1

•a

I<

Daily 

average

S^

Q,^

9 ®

21•<

III 

i&B 

•<

Daily rad'ation (cal cm~2 day-1)

ogjij 

I 8

^ & o>f£q S f

'S'Tj'S

M O tn

w

1

•a

•<i

Daily

average

<e®

lia* «j

&L

> i-s

6 S3 

<

PIKES PEAK, COLORADO— Con timed 

1956— Continued

1..-—.

3— ——

4———— 

5 __ — 

6...——

7———— 

8_— — 

9————

10 

11

iq

14.

15

17 

18 

19 

20 

21 

22. 

23 

24 

25 

26———

27 

28 

29 

30 

31

1.. _

2...—

3——— .

4... ——

5...——

6 ...

7—— _..

8...— .

9——— _

10..——

11— —

12———

13———

14———

15—— _

16——— 

17.. _ _

18——— 

19——— 

20———

21.. _ _ 

22,. _ . 

23——— 

24——— 

25——— 

26——— 

27——— 

28——— 

29— — 

30——— 

31...—

October

471 

553 

262 

509 

390 

538 

389 

284 

316 

524

554 

549 

544 

538 

533 

528 

523 

517 

512 

507

418 

446 

448 

429 

459 

438 

465 

466 

448 

418

IV

4.2 

4.6 

3.7 

5.8 

7.7 

5.7 

7.6 

6.3 

3.9 

5.9

IOSSB

4.3 

4.2 

5.1 

4.0 

4.3 

4.5 

4.7 

4.7 

4.6 

3.6

LUFF,

1957

March

560 

508 

541 

509

438 

442

528 

484 

259 

581 

582 

610 

528 

140 

562 

235 

247

565 

570 

574 

578 

582 

586 

590 

594 

598 

602 

606 

610 

614 

618 

623 

627 

631 

636 

641

592 

596 

600 

604 

607 

611 

615 

619 

623 

627 

631 

635 

639 

643 

647 

651 

655 

659 

663

17.2 

18.7 

14.9 

15.2 

16.2 

19.9 

17.9 

16.0 

16.8 

16.4 

17.8 

10.2 

8.8 

10.3 

14.8 

12.6 

13.6 

16.3 

16.3

15.7 

15.6 

5.5 

9.2 

17.8 

20.9 

15.7 

15.4 

14.1 

14.9 

15.7 

7.1 

6.2 

6.8 

13.0 

13.6 

11.3 

16.5 

16.7

TEXAS

April

662 

395 

80 

629 

680 

624 

265 

523 

689 

224 

388 

618 

380 

446 

498 

193 

487 

445 

381 

362 

359 

566 

394 

388 

486 

481 

213 

110 

280 

157

667 

671 

675 

679 

682 

686 

690 

693 

697 

700 

703 

707 

711 

714 

717 

721 

724 

727 

730 

733 

736 

739 

741 

743 

745 

748 

751 

753 

755 

758

647 

826 

774 

662 

574 

593 

765 

635 

556 

704 

684 

734 

683 

681 

715 

714 

785 

842 

830 

794 

740 

797 

820 

767 

852 

774 

754 

725 

713 

647

18.8 

21.4 

20.8 

18.8 

13.1 

13.9 

16.6 

15.1 

11.5 

13.8 

16.8 

19.1 

10.9 

12.2 

16.3 

18.1 

20.3 

21.9 

21.5 

18.8 

15.6 

20.4 

23.1 

23.3 

23.4 

23.1 

20.9 

18.1 

18.8 

147

16.3 

22.7 

22.4 

14.9 

6.8 

9.5 

16.6 

9.7 

7.8 

13.1 

17.0 

16.4 

9.4 

10.4 

13.4 

19.0 

20.9 

24.1 

22.3 

19.3 

147 

20.4 

24.4 

24.7 

24.4 

244 

22.3 

20.0 

19.3 

16.0
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 123

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation 

(cal cm.-2 day-1 )

"S

1 s

ra 73 1"

•d J2>

<oM •*> rn

J

03 03 

«•§"§

w

«

Io

s

•<

Daily 

average

feO t"^

<0 H

.Sa'cs <!

*§§•82

SSi •<

Daily radiation (cal cm-2 day-1 )

•c

§

-2 o

S

•o b

1?

tgll 

W

o

S 

a

I

^

Daily 

average

feO 

t«Is

its <!

Ld » 

11-

?il JaaS <!

MOSS BLUFF, TEXAS— Continued 

1957— Continued

1———— 

2—— — 

3— — .

4— — .

5—— — 

5— __

7

<! 

•).. ___ .

10———

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22. _ .. 

23 

24——- '25 

'26

'27

28——

29— —

30

31

3— — -

4—— ...

ft—— —

•3

•0— ... •1——

'2

•3———

•4———

A ,5— —

•ft——— '7 

'8— — 

'9— — 

90——— 

91...... 

32——— 

23——— 

34— — 

35— — 

36——— ::7—— y*__ ....

"9..-.- 

•<0———

May

518 

442 

540 

537 

684 

668 

439 

566 

642 

642 

635 

433 

447 

607 

529 

647 

695 

420 

718 

583 

590 

528 

436 

505 

535 

512 

494 

677 

734 

478 

285

76i 

764 

767 

769 

771 

773 

775 

777 

779 

780 

782 

784 

786 

788 

789 

791 

792 

794 

796 

797 

799 

801 

802 

804 

805 

806 

807 

808 

809 

810 

811

718 

763 

734 

717 

639 

593 

694 

733 

698 

740 

785 

803 

857 

831 

814 

747 

728 

737 

665 

770 

826 

802 

821 

814 

823 

797 

763 

787 

707 

725 

755

17.6 

20.9 

20.8 

18.9 

15.6 

15.9 

17.6 

20.7 

21.3 

22.3 

23.1 

24.6 

24.8 

25.0 

24.9 

25.5 

23.9 

20.7 

18.6 

22.2 

26.3 

26.1 

25.7 

25.9 

25.6 

24.4 

23.4 

23.3 

22.8 

22.9 

22.3

16.1 

21.0 

20.5 

14.8 

9.3 

11.2 

15.1 

19.4 

19.5 

22.2 

23.2 

25.7 

25.9 

26.2 

26.0 

25.0 

22.1 

20.6 

15.2 

22.5 

28.5 

28.1 

27.6 

27.5 

27.2 

23.9 

20.3 

17.0 

17.3 

22.7 

24.2

July

709 

730 

697 

700 

725 

675 

566 

668 

682 

679 

655 

712 

588 

560 

661 

646 

469 

553 

502 

352 

110 

515 

575 

569 

355 

638 

701 

695 

674 

548

817 

817 

817 

817 

816 

816 

815 

815 

815 

814 

813 

812 

811 

810 

809 

808 

807 

805 

803 

802 

801 

800 

799 

797 

796 

794 

793 

792 

790 

789

773 

803 

776 

795 

780 

797 

767 

779 

805 

800 

832 

769 

784 

818 

786 

780 

800 

797 

809 

797 

748 

819 

806 

809 

817 

807 

788 

814 

823 

844

26.8 

27.4 

27.4 

27.1 

28.2 

28.7 

26.3 

26.7 

28.0 

28.4 

28.6 

27.6 

25.9 

26.7 

26.4 

26.6 

25.8 

27.0 

25.8 

24.4 

23.5 

26.1 

26.4 

26.3 

25.6 

26.1 

27.0 

28.4 

27.9 

27.6

25.4 

27.8 

27.7 

27.9 

27.8 

29.4 

24.3 

25.5 

26.6 

26.7 

27.5 

24.7 

25.4 

25.6 

25.1 

25.0 

27.3 

26.0 

27.2 

27.8 

26.9 

27.7 

26.7 

26.7 

26.6 

24.4 

24.0 

25.8 

26.2 

28.4

June

449 

287 

437 

517 

333 

433 

549 

561 

689 

751 

727 

711 

700 

742 

629 

583 

729 

395 

533 

403 

322 

371 

452 

695 

622 

446 

120 

, 623 

616 

681

812 

813 

813 

814 

814 

815 

815 

816 

816 

817 

817 

817 

818 

818 

818 

818 

819 

819 

819 

819 

819 

819 

818 

818 

818 

818 

818 

817 

817 

817

758 

727 

779 

739 

727 

692 

727 

780 

756 

776 

758 

764 

775 

770 

766 

784 

748 

764 

778 

742 

767 

808 

789 

754 

756 

769 

796 

793 

807 

752

22.4 

20.7 

21.7 

22.0 

20.5 

19.4 

20.7 

25.3 

25.9 

26.3 

26.4 

26.3 

26.8 

26.8 

26.8 

26.2 

26.2 

25.1 

25.1 

25.1 

25.1 

25.7 

24.6 

24.0 

25.1 

23.5 

24.0 

26.2 

26.8 

26.8

24.0 

23.3 

22.4 

21.8 

21.2 

18.5 

19.6 

25.8 

26.6 

27.5

25.0 

25.4 

25.4

August

452 

641 

661 

700 

617

786 

784 

783 

781 

779

840 

814 

794 

781 

799

27.3 

27.6 

26.7 

28.4 

27.9

28.5 

28.4 

25.8 

29.3

Day

Daily radiation (cal cm-2 day-1 )

•0

§ 3 S» W 03

^ o § w

•0 >>

•iS'M

|Ss

3-2-3

CO 0 M 

W

o

I

8

a 

<

Daily 

average

is IV•*B «J03

ILCi m o

r

^£gs

Daily radiation (cal cm-2 day-1)

•0 

in 03 !•

«£? 3)44 *ls

to'o tn

W

s

s 3

Daily 

avenge

&0

O<-v

§ 1

3* i1 ^

lit 

•<

HONEY CREEK, TEXAS

1957

1— ——

2...... 

3——— 

4—— ... 

5— ... - 

6 

7... — - 

8— — . 

9-_ — - 

10 

11———

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

23 

24

25 

26

27 

28 

99

30

31———

1- _ .

2__ ....

3— .___

4————

5— — .

6.._ — .

7— — .

8....—

9.-.—.

10——.

11—— _

12———

13——

14———

15— —

16———

17———

18— —

19— —

20———

21———

22———

23- ——

24———

26— —

26———

27— —

28———

29— —

30———

31.. ....

September

413

218 

163 

459 

450 

385 

535 

503 

472 

525 

541

621 

617 

612 

608 

603 

599 

595 

590 

586 

581 

577

858 

768 

666 

651 

669 

746 

745 

712 

698 

650 

620

29.4 

26.4 

20.5 

19.0 

19.6 

20.2 

22.8 

22.4 

24.2 

20.6 

19.8

24.5 

28.2 

19.6 

14.6 

15.8 

16.5 

18.1 

18.1 

15.6 

14.5 

12.5

November

172 

218 

103 

27 

27 

75 

121 

401 

404 

204 

283 

53 

104 

297 

305 

248 

151 

129 

357 

345 

280 

52 

186 

94 

347 

343 

284 

342 

286 352'

441 

437 

433 

429 

425 

422 

418 

414 

410 

407 

404 

400 

397 

394 

391 

388 

385 

382 

379 

376 

374 

371 

368 

365 

363 

361 

358 

356 

354 

352

776 

704 

718 

651 

595 

728 

663 

515 

522 

601 

677 

649 

713 

597 

630 

724 

779 

588 

498 

524 

554 

522 

628 

493 

534 

557 

586 

511 

506 

438

20.6 

18.3 

12.3 

11.9 

11.7 

13.1 

14.5 

11.1 

9.3 

8.5 

10.3 

10.1 

13.0 

13.2 

17.4 

17.5 

18.1 

7.3 

7.7 

9.8 

8.5 

3.2 

5.2 

5.7 

10.2 

13.6 

13.7 

8.5 

6.8 

6.G

21.9 

17.0 

11.2 

13.8 

13.4 

14.8 

15.0 

8.4 

7.6 

7.9 

9.4 

10.2 

14.1 

13.2 

12.9 

15.2 

18.5 

8.1 

7.9 

7.9 

5.7 

6.6 

6.3 

7.9 

9.0 

10.1 

11.7 

7.5 

6.8 

4.9

October

524 

513 

494 

475 

490 

434 

358 

280 

185 

158 

337 

412 

24 

44 

122 

327 

469 

469 

455 

435 

229 

89 

424 

116 

89 

462 

453 

452 

263 

420 

366

573 

568 

564 

560 

556 

551 

547 

543 

538 

534 

529 

525 

520 

516 

512 

508 

504 

600 

496 

491 

487 

483 

479 

474 

469 

465 

462 

458 

454 

450 

445

650 

672 

701 

735 

737 

731 

737 

761 

767 

744 

726 

726 

724 

788 

782 

768 

684 

281 

592 

631 

740 

723 

638 

717 

692 

519 

453 

503 

657 

651 

677

20.8 

22.4 

23.3 

24.7 

24.3 

23.1 

22.2 

21.2 

18.8 

16.6 

18.5 

20.0 

16.5 

18.8 

18.4 

20.6 

18.9 

15.8 

13.6 

13.0 

17.5 

20.1 

18.7 

13.6 

9.1 

5.3 

4.5 

7.7 

14.2 

19.0 

18.9

12.6 

13.1 

12.7 

22.4 

19.4 

18.1 

17.3 

20.1 

19.0 

15.8 

15.9 

13.3 

15.6 

20.6 

21.0 

19.7 

19.2 

11.7 

9.5 

9.9 

14.7 

22.9 

12.9 

11.9 

8.8 

6:2 

6.2 

6.5 

13.7 

17.1 

17.0

December

352 

223 

316 

334 

320 

42 

329 

329 

312 

328 

340 

329 

314 

272 

203 

110 

91 

284 

254 

327 

295 

262 

116 

70 

296 

316 

109 

317 

304 

65 

302

350 

348 

346 

344 

342 

341 

339 

337 

336 

335 

334 

333 

332 

331 

330 

329 

329 

328 

328 

328 

327 

327 

327 

327 

327 

327 

328 

328 

329 

329 

330

429 

552 

543 

507 

551 

636 

524 

477 

493 

482 

371 

471 

537 

651 

727 

755 

746 

680 

690 

496 

524 

600 

773 

659 

521 

506 

616 

495 

525 

682 

556

8.9 

13.3 

10.7 

11.3 

13.1 

15.5 

9.0 

7.5 

7.3 

8.0 

-1.4 

3.4 

9.8 

14.9 

17.8 

19.2 

18.2 

17.6 

16.4 

11.1 

11.0 

13.3 

16.7 

12.6 

11.4 

10.3 

10.6 

8.0 

8.6 

11.8 

6.9

5.5 

10.1 

7.4 

6.3 

7.7 

14.9 

8.2 

5.5 

6.0 

5.8 

5.3 

5.5 

8.5 

13.9 

17.0 

18.7 

18.6 

13.0 

9.5 

5.6 

6.5 

10.3 

16.1 

13.3 

10.9 

7.6 

9.3 

6.6 

7.7 

13.5 

7.2
124 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (cal cm-2 day-i)

•o 

§

1| I 8

•ofr

<t>-M 

1j V 

g & &

•|3,2o to 0 oo w

.2 

I

I •<

Daily 

average

i?a_

£"3 II 

-<

1- OJ

p~03 cnj2

'•<Ell

Daily radiation (cal cm-2 day-i)

§| 1*

•o b

s>M 

11 ja

111 fle .

_o

1

I 

^

Daily 

average

«P

ll

£ o§ «J

t-i *

SiSS" 

>2| 

.ts &•»

•<

HONEY CREEK, TEXAS-Continued

1958

1.... .

2 _ . .

3.———

4.......

5.—

6————

7— ....

8———.

9.... _

10———

11———

12.. _ _

13.. _ _

14———

15.... .

16———

17———

18———

19.———

20———

21———

22... _

23———

24......

25.. _ -

26. __ _

27———

28———

29———

30———

31———

2...._._

5..._.__

6..__._.

7—— —

g

g

10———

11———

12.._.__

13———

14- __

15.._

16.. __ 

17. _ .. 

18. ___ 

19.. _ _ 

20——— 

21——— 

22.— 

23....__ 

24...... 

25...... 

26.... __ 

27.. __ 

28——— 

29..._._ 

30——— 

31..___.

January

335 

331 

281 

264 

171 

213 

345 

344 

302 

323 

98 

64 

193 

128 

146 

341 

325 

268 

28 

52 

368 

309 

198 

381 

256 

374 

294 

283

391

331 

332 

333 

335 

337 

338 

339 

341 

343 

345 

347 

349 

351 

353 

355 

357 

359 

361 

363 

366 

369 

372 

375 

378 

381 

384 

387 

390

400

441 

468 

501 

563 

624 

533 

422 

439 

523 

568 

680 

627 

673 

667 

558 

498 

521 

566 

668 

619 

549 

541 

549 

483 

583 

507 

615 

594

537

3.9 

6.1 

5.7 

6.6 

6.7 

6.9 

1.9 

1.6 

7.8 

10.0 

11.7 

12.6 

11.4 

9.9 

4.2 

7.4 

10.1 

7.7 

8.8 

5.9 

4.2 

6.2 

7.0 

5.8 

10.2 

9.4 

9.0 

10.8

11.0

5.2 

5.0 

5.5 

4.9 

5.7 

6.2 

5.9 

4.2 

6.2 

8.8 

12.4 

14.3 

12.1 

11.1 

7.1 

7.7 

8.0 

8.0 

10.2 

8.9 

6.7 

6.9 

7.0 

7.0 

8.4 

6.9 

7.4 

6.2

6.6

March

106 

341 

253 

165 

121 

69 

465 

388 

264 

182 

355 

76 

167 

567 

459 

299 

164 

277 

584 

536 

443 

195 

293 

238 

118 

468 

155 

367 

589 

233 

612

517 

521 

526 

530 

534 

539 

543 

548 

552 

556 

561 

565 

570 

574 

579 

583 

587 

592 

596 

600 

604 

608 

612 

617 

621 

625 

629 

634 

638 

642 

647

576 

634 

616 

599 

698 

728 

672 

659 

598 

633 

648 

606 

609 

475 

599 

659 

615 

594 

554 

534 

609 

729 

709 

623 

663 

641 

683 

732 

633 

662 

610

4.3 

7.8 

8.4 

4.6 

10.6 

12.3 

15.8 

11.7 

7.7 

9.5 

7.4 

5.0 

4.6 

5.4 

8.3 

11.3 

7.3 

4.5 

7.9 

10.4 

13.9 

17.5 

13.7 

9.3 

8.9 

11.6 

10.2 

14.8 

14.0 

10.5 

11.9

6.2 

6.9 

8.1 

9.2 

11.5 

13.9 

13.8 

10.7 

8.6 

9.9 

7.1 

7.1 

6.7 

6.4 

7.0 

4.4 

8.4 

6.0 

6.5 

6.9 

9.4 

15.9 

13.1 

8.5 

9.1 

9.3 

10.4 

12.3 

12.2 

9.9 

10.2

February

402 

409 

400 

126 

281 

262 

432 

410 

59 

40 

146 

438 

428 

62 

277 

404 

325 

92 

96 

124 

260 

251 

407 

446 

379 

287 

505 

518

403 

406 

408 

414 

417 

421 

425 

429 

433 

437 

441 

445 

449 

453 

457 

461 

465 

469 

474 

478 

483 

487 

491 

496 

500 

504 

508 

512

474 

454 

489 

717 

679 

588 

450 

511 

568 

618 

614 

483 

500 

563 

496 

536 

581 

673 

699 

709 

688 

699 

636 

620 

686 

668 

537 

486

8.2 

6.6 

4.0 

12.4 

17.4 

7.4 

1.2 

4.4 

3.6 

1.2 

-.8 

-2.4 

0 

3.9 

-.4 

-.8 

2.2 

3.4 

6.2 

7.4 

10.8 

12.4 

14.3 

12.8 

15.8 

15.6 

12.8 

9.2

6.2 

6.0 

5.0 

11.3 

16.0 

8.1 

4.9 

5.1 

5.7 

6.2 

3.9 

3.3 

4.0 

6.9 

4.2 

4.5 

4.8 

5.7 

6.2 

6.4 

6.5 

10.7 

13.3 

13.6 

14.1 

12.0 

5.5 

5.8

April

540 

326 

398 

469 

540 

648 

661 

331 

409 

251 

628 

430 

95 

379 

680 

689 

313 

235 

300 

517 

227 

647 

591 

284 

316 

78 

185 

109 

146 

29

651 

655 

659 

663 

668 

672 

676 

680 

684 

688 

692 

696 

700 

703 

706 

710 

714 

718 

721 

724 

728 

731 

733 

736 

739 

742 

745 

748 

751 

754

682 

733 

710 

687 

669 

555 

523 

642 

723 

669 

573 

675 

659 

630 

584 

634 

685 

723 

766 

701 

693 

706 

793 

740 

787 

753 

813 

798 

726 

735

17.4 

18.8 

18.5 

18.2 

17.8 

14.9 

11.9 

12.0 

13.6 

10.7 

11.9 

14.7 

13.2 

13.6 

15.8 

17.5 

16.8 

15.6 

18.3 

18.8 

17.3 

18,8 

25.5 

16.6 

16.8 

15.8 

18.4 

20.4 

14.1 

11.2

14.4 

16.3 

12.5 

7.6 

5.8 

8.0 

7.5 

9.4 

13.1 

10.0 

8.8 

9.3 

13.1 

12.7 

11.3 

11.7 

14.1 

15.5 

18.2 

15.7 

15.2 

15.0 

24.1 

11.7 

13.8 

16.9 

19.4 

22.3 

13.6 

11.8

Day

Daily radiation 

(cal cm~2 dayi)

•o

o> 

|1

•o £? <uM

'-8 Ifo-Si 

W

o'S3 

3

I

+*

•<

Daily 

average

ig

!l

.tsa 

•<

h O>

OS'S 2"

f s| .tsftS •<

Daily radiation 

(cal cm-2 dayi)

•o

o>

la

03^ ss

•rt >> 

S'M

a & Jj 2'S'o CO d 03

w

! •a

s jj

<

Daily 

average

il

s £

£S

.fcl 0§ •<

I* «

03 M^n1

fs| .tsft-5- 

•<

HONEY CREEK, TEXAS— Continued 

1958— Continued

1- ..

9

3_....__

5— 

6

7...

8..

9

10-....

11—.

12———

13-

14.. 

16____~~ 15 

17-.. "

IB

19...... 

20______

21———

22_. — _

OQ

24——— 

25——. 

26__ ——

27—...

98

9Q

on

01

I-.—2— — .

3— ....

4—— __.

5—— ...

6___ ——

7— ——

8——— _

9————

10———

11—...

12———

13———

14—...

15———

16——— 

17— — 

18——— 

19——— 

20——— 

21-.. 

22——— 

23——— 

24——— 

25_ _ . 

26_._ — 

27— — 

28——— 

29——— 

30——— 

31..

May

170 

63 

366 

544 

591 

697 

674 

331 

364 

628 

695 

665 

382 

293 

454 

650 

686 

507 

571 

745 

747 

721 

721 

626 

553 

721 

657 

564

757 

760 

763 

766 

769 

771 

773 

775 

777 

778 

780 

782 

784 

786 

788 

790 

792 

794 

796 

797 

799 

801 

803 

804 

805 

807 

808 

809

763 

836 

737 

731 

700 

666 

690 

752 

782 

747 

737 

715 

781 

732 

783 

764 

736 

769 

742 

714 

696 

712 

769 

795 

763 

763 

823 

821

15.4 

19.6 

19.6 

19.6 

17.6 

19.4 

21.0 

21.9 

20.1 

21.4 

22.8 

23.2 

22.7 

22.4 

23.4 

23.6 

23. 1 

23.4 

22.8 

22.7 

23.0 

24.4 

26.4 

27.3 

24.8 

27.0 

29.0 

27.2

16.4 

21.8 

20.4 

17.8 

15.0 

14.4 

16.0 

18.9 

19.0 

17.3 

17.1 

16.8 

18.8 

22.2 

21.8 

19.2 

18.7 

18.8 

19.6 

15.6 

14.1 

17.2 

20.4 

22.0 

24.2 

20.9 

23.8 

25.0

July

620 

706 

631 

583 

277 

142 

458 

655 

718 

612 

716 

673 

708 

548 

709 

697 

707 

620 

712 

635 

500 

618 

529 

688 

613 

695 

686 

586 

598 

691 

668

821 

820 

820 

819 

818 

817 

816 

815 

814 

813 

812 

811 

810 

808 

807 

806 

805 

804 

803 

802 

801 

800 

799 

798 

797 

796 

794 

792 

790 

788 

786

785 

763 

763 

767 

740 

796 

799 

744 

814 

859 

816 

830 

871 

885 

818 

804 

829 

877 

773 

829 

868 

857 

826 

832 

851 

820 

817 

909 

844 

829 

851

27.6 

27.7 

28.0 

26.9 

22.0 

22.0 

23.2 

23.2 

27.5 

28.7 

29.4 

29.8 

30.0 

30.2 

30.9 

31.0 

30.8 

30.8 

31.6 

31.0 

28.8 

29.9 

27.5 

30.6 

31.8 

31.6 

31.7 

31.6 

31.9 

33.0 

32.4

26.9 

24.7 

24.3 

24.5 

24.0 

25.1 

23.4 

21.0 

24.1 

26.5 

25.2 

24.9 

24.8 

25.4 

26.5 

21.7 

25.3 

26.0 

22.1 

24.9 

22.3 

24.4 

20.6 

25.6 

27.9 

27.6 

27.7 

27.6 

28.1 

30.3 

31.8

June

592 

609 

722 

706 

659 

707 

714 

737 

701 

323 

320 

412 

545 

420 

479 

256 

319 

615 

685 

283 

738 

749 

726 

668 

587

818 

819 

819 

820 

820 

820 

821 

821 

822 

822 

822 

823 

823 

824 

824 

824 

824 

824 

824 

823 

823 

822 

822 

822 

821

852 

858 

811 

810 

834 

818 

828 

797 

835 

879 

803 

850 

867 

844 

841 

827 

761 

723 

775 

797 

637 

665 

695 

734 

812

August

694 

473 

673 

668 

659 

547 

614 

445 

415 

650 

566 

592 

598 

644 

641 

590 

464 

383 

577 

497 

179 

436 

488 

520 

649 

620 

578 

616 

623 

559 

613

784 

782 

780 

778 

776 

774 

772 

770 

768 

766 

763 

760 

757 

755 

752 

749 

746 

743 

740 

737 

734 

731 

727 

724 

721 

718 

7:5 7"! 

707 

703 

700

793

877 

856 

853 

852 

844 

849 

869 

793 

840 

820 

819 

838 

842 

837 

838 

872 

851 

841 

783 

833 

856 

844 

805 

706 

716 

745 

757 

733 

746 

798

26.7 

27.9 

28.5 

29.3 

30.0 

30.2 

29.6 

29.1 

29.2 

28.7 

23.2 

24.2 

27.2 

28.0 

26.9 

23.5 

21.4 

24.4 

26.9 

23.1 

19.8 

22.1 

22.7 

24.9 

26.9

23.3 

25.0 

24.4 

24.9 

27.3 

25.8 

29.2 

24.7 

24.4 

30.7 

25.4 

24.9 

27.4 

28.4 

28.9 

26.3 

22.2 

20.1 

23.1 

22.6 

15.0 

16.0 

18.1 

21.9 

27.6

32.7 

32.2 

31.7 

31.6 

31.4 

31.6 

31.6 

29.7 

26.2 

28.8 

28.6 

29.2 

31.4 

30.8 

31.4 

30.6 

28.0 

26.4 

28.0 

27.5 

24.9 

25.9 

27.0 

26.6 

25.8 

27.4 

29.0 

30.2 

29.6 

27.1 

29.2

28.4 

28.7 

27.7 

27.6 

27.2 

27.6 

26.3 

27.0 

18.7 

22.6 

22.2 

23.2 

24.6 

25.0 

28.0 

27.5 

26.4 

25.5 

25.7 

27.5 

28.7 

27.1 

26.1 

22.9 

15.1 

17.1 

21.2 

22.8 

23.2 

21.9 

24.9
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and

air-vapor pressure at various localities for time shown—Continued

125

ily average air temperature and

Day

Dally radiation 

(cal cm.-2 day-1 )

ll §"

•c >?

fla

«"i« 

w

o

1

•3

Daily 

average

«?s"^ 

§1

.ta« •<

a «'~

?g| .taaS

•<

Daily radiation 

(cal cm.-2 day-1 )

73

^M_w Is

«£? 

|| a

'S'S M

w

1 

A 

a

I

-<1

Daily 

average

go ai,

a« 23 .Scs «!

IL03 en rj 

> g g

.Sa a£ «!

HONEY CREEK, TEXAS— Continued 

1958— Continued

!-....._

2——

3.......

4———_

5... .

6.... ..

7——— _

8.......

9————

10———

11———

12-....

13......

14_._...

15-....

16......

17— —

18-..__

19———

20———

21— ..

22- ——

23———

24— — 

25- —— 

26- .

27———

28———

29———

30———

31———

1—

2————

3...

4—

5————

6-.

7— ....

8————

9... .

10- —— 

11-

12- .

13———

14- _

15... ..

16..

17- ——

18———

19-

20———

21-....

22... ..

23———

24———

25-. ..

26———

27———

28——

29———

30———

31-

September

580 

613 

566 

574 

446 

313 

248 

358 

325 

321 

524 

424 

568 

371 

427 

201 

557 

253 

74 

325 

334 

223 

344 

533 

434 

310 

496 

550 

428 

69

696 

692 

688 

684 

680 

676 

672 

668 

664 

660 

657 

653 

649 

645 

641 

638 

634 

630 

626 

621 

617 

612 

608 

603 

599 

595 

590 

586 

581 

577

796 

738 

766 

783 

824 

853 

846 

806 

836 

793 

757 

787 

712 

781 

805 

799 

726 

832 

760 

836 

819 

856 

825 

763 

800 

790 

716 

620 

694 

749

29.8 

29.0 

28.0 

28.2 

26.8 

26.3 

25.8 

24.4 

26.3 

25.2 

25.1 

23.5 

23.3 

24.0 

26.2 

24.1 

20.3 

21.3 

21.4 

23.5 

24.0 

23.8 

26.6 

27.1 

26.5 

24.8 

22.3 

18.2 

19.2 

17.1

24.0 

22.5 

22.2 

21.9 

22.8 

25.1 

25.2 

24.2 

25.1 

25.6 

24.4 

20.4 

18.6 

22.0 

22.8 

25.8 

16.3 

20.9 

24.6 

25.0 

24.9 

26.3 

28.1 

26.5 

25.7 

25.5 

17.4 

11.0 

14.1 

15.3

November

413 

421 

359 

384 

213 

360 

397 

399 

398 

384

441 

437 

433 

429 

425 

422 

418 

414 

410 

407

467 

463 

580 

611 

623 

520 

511 

540 

529 

534

8.0 

9.6 

14.8 

16.1 

16.1 

11.2 

11.9 

14.6 

16.3 

15.7

5.8 

5.8 

8.8 

13.3 

11.6 

5.0 

7.6 

8.7 

7.4 

6.0

October

518 

484 

82 

109 

144 

310 

206 

333 

439 

194 

107 

494 

451 

196 

287 

442 

433 

422 

470 

468

313 

147 

364 

213

573 

568 

564 

560 

556 

551 

547 

543 

538 

534 

529 

525 

520 

516 

512 

508 

504 

500 

496 

491

458 

454 

450 

445

625 

634 

627 

731 

741 

732 

801 

809 

752 

791 

757 

680 

651 

727 

768 

689 

647 

633 

620 

626

559 

611 

649 

588

13.9 

14.0 

12.2 

13.8 

16.6 

19.5 

22.0 

24.5 

24.5 

18.7 

15.7 

16.8 

16.8 

17.4 

18.9 

19.0 

18.7 

20.5 

21.3 

20.8

8.1 

8.6 

11.1 

9 2

10.4 

12.3 

13.0 

14.8 

17.2 

15.9 

18.3 

24.3 

27.7 

24.3 

22.5 

19.0 

15.9 

13.7 

19.0 

20.4

19.6 

17.0 

17.7

4.8 

5.9 

6.8 

7.5

Day

Daily radiation (cal em-2 day-i)

1

S'3 la

£"

*rt ^> 

<&J4

|Sa •te

N

•so

1I-<!

Daily 

average

|g 

!i

a "3 •< III

-<

Daily radiation (cal cm-3 day-i)

•o 

§

ll I 8

*rt ^» 

5 J4 

SjP

l-il 

w

•8 

1

I

-<!

Daily

average

£p 

It

si .*! •<

C3 coS*

III •<

SAN VICENTE, CALIF. 

1957

1- ...

2.. ...

3—— _.

4—— .

5— —

6— —

7—— _

8— ...

9_. ...

10——

11——

12. ....

13———

14.———

15———

16———

17— —

18———

19———

20———

21———

22.

23———

24———

25———

26———

27———

28———

29———

30———

31. ..

l.._ — .

2.. ....

6-.——

7... — .

9-_ ——

10———

11- ...

12..... .

13——— 

14.. ..

16——— 

17....- 

18——— 

19——— 

20———

21. .. 

22.. .. 

23——— 

24——— 

25——— 

26——— 

27——— 

28——— 

29——— 

30——— 

31———

September

436 

571 

589 

566 

537 

544 

566 

569 

510 

546 

548

696 

692 

688 

684 

680 

676 

672 

668 

664 

660 

657

749 

659 

624 

671 

707 

688 

659 

643 

697 

689 

657

19.5 

20.0 

22.5 

22.5 

23.2 

17.0 

21.0 

22.0 

24.2 

23.8 

21.8

15.0 

15.2 

12.5 

13.0 

14.4 

16.0 

15.8 

12.8 

12.8 

13.4 

14.7

November

193 

173 

298 

220 

186 

407 

406 

402 

390 

383 

398 

378 

349 

202 

207 

146 

394 

382 

362 

377 

362 

391 

359 

367 

371 

356 

349 

346 

362 

365

441 

437 

433 

429 

425 

422 

418 

414 

410 

407 

404 

400 

397 

394 

391 

388 

385 

382 

379 

376 

374 

371 

368 

365 

363 

361 

358 

356 

354 

352

716 

719 

580 

633 

617 

521 

529 

542 

545 

637 

637 

568 

464 

640 

681 

662 

563 

528 

570 

580 

541 

461 

525 

602 

538 

530 

535 

542 

482 

485

15.7 

13.2 

9.5 

11.2 

12.0 

12.0 

13.0 

14.0 

14.5 

16.0 

14.5 

13.0 

13.0 

12.0 

12.0 

9.1 

9.0 

11.0 

13.5 

17.0 

16.5 

13.5 

13.0 

17.0 

17.0 

15.0 

13.5 

15.0 

14.0 

18.2

14.0 

12.4 

10.3 

10.4 

10.6 

8.8 

9.2 

10.4 

10.9 

10.9 

11.3 

11.2 

12.8 

13.9 

12.3 

8.8 

9.2 

8.0 

8.2 

9.6

8.6 

7.6 

8.6 

7.6

October

566 

538 

361 

527 

530 

532 

524 

520 

515 

515 

225 

290 

150 

305 

200 

447 

407 

57 

116 

200 

317 

433 

462 

451 

439 

203 

362 

130 

414 

90 

182

573 

568 

564 

560 

556 

551 

547 

543 

538 

534 

529 

525 

520 

516 

512 

508 

504 

500 

496 

491 

487 

483 

479 

474 

469 

465 

462 

458 

454 

450 

445

599 

706 

733 

646 

598 

574 

573 

570 

570 

570 

575 

570 

600 

670 

650 

645 

722 

744 

765 

721 

640 

580 

582 

591 

620 

693 

648 

677 

651 

712 

721

19.5 

17.8 

17.2 

18.0 

17.0 

16.5 

17.5 

19.0 

18.8 

17.8 

16.0 

15.2 

15.0 

16.8 

16.5 

18.2 

16.2 

16.2 

16.5 

14.5 

13.5 

14.8 

16.8 

17.5 

19.8 

19.0 

18.2 

16.0 

18.2 

17.5 

15.8

12.4 

13.5 

13.9 

13.0 

12.3 

13.5 

11.7 

11.1 

12.4 

13.8 

14.3 

14.3 

15.3 

15.8 

15.7 

14.9 

17.1 

17.0 

15.7 

11.6 

11.5 

10.9 

10.9 

11.3 

10.9 

12.4 

15.0 

15.5 

13.2 

14.6 

16.2

December

330

294 

356 

80 

174 

333 

335 

332 

327 

324 

329 

320 

260 

158 

59 

154 

244 

152 

311 

315 

304 

248 

289 

313 

325 

342 

306 

302 

321 

330 

323

350 

348 

346 

344 

342 

341 

339 

337 

336 

335 

334 

333 

332 

331 

330 

329 

329 

328 

328 

328 

327 

327 

327 

327 

327 

327 

328 

328 

329 

329 

330

490 

496 

508 

688 

581 

554 

543 

575 

590 

575 

568 

570 

581 

692 

793 

781 

677 

682 

568 

552 

616 

611 

586 

524 

520 

612 

547 

542 

544 

560 

538

16.7 

15.2 

16.2 

14.5 

11.5 

13.2 

15.2 

15.8 

17.8 

17.0 

17.0 

17.0 

15.2 

15.8 

16.5 

16.0 

14.2 

12.2 

13.8 

13.8 

12.8 

13.2 

12.8 

13.0 

14.8 

14.8 

13.5 

13.2 

11.8 

15.0 

13.8

7.7 

11.5 

10.9 

8.2 

8.5 

7.5 

8.4 

7.7 

7.4 

7.4 

9.2 

15.2 

16.0 

13.4

10.5 

8.7 

10.4 

11.7 

11.5 

9.6 

5.9 

8.0 

9.9 

9.1 

10.3 

8.2 

8.0
126 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (cal cm-2 day-1 )

•a 

ll

s

•2.M

<1> pSfl

•S| fe 

'•S'SS

w

'S3o

•a

•<i

Daily 

average

fep

||

.SaS

•<

Lw <B

ogS'ffiS'

f2a .Saa-S- 

•<

Daily radiation 

(cal cm-2 day-1 )

•s 

Is(375 i'

•a >> 

||^

S'il

w

_o*£H 

0> fl

I•<

Daily 

average

£o

as^

.fciS •<

|i- O3 O3.Q 'rag .Saa-5- 

•<

SAN VICENTE, CALIF.— Continued 

1958

1—- -

2.__ ——

3.. __ -

4.... _ 

5___.

6.. _ - 

7——— _ 

8_._——

9___ —— 

10 

11

12—— 

13———

14- _ .

15——

17——

18

20

22..-— 

23——

24—— 

25 

26 

27 

28 

29 

30———

31

1.. .....

2.. .....

3.———-

4.. ....

5.., _ .

6_._——

7——— .

8—— —

9_—— -

10———

11..- _

12—— 

13——

14———

15.. ....

16———

17——— 

18.. _ _ 

19—— 

20_——— 

21—— _ 

22—-- 

23.——— 

24——— 

25——— 

26——— 

27.. _ - 

28——— 

29——— 

30——— 

31——— _

January

314 

312 

323 

329 

340 

259 

344 

328 

252 

246 

331 

259 

280 

355 

365 

310 

298 

363 

376 

384 

305 

388 

386 

163 

149 

218 

328 

335 

389 

228

290

421 

278 

414 

539 

547 

54 

446 

314 

518 

519 

290 

260 

465 

503 

157 

145 

359 

548 

593 

212 

272 

486 

544 

514 

481 

1 437 

164 

367 

500 

480 

397

331 

332 

333 

335 

337 

338 

339 

341 

343 

345 

347 

349 

351 

353 

355 

357 

359 

361 

363 

366 

369 

372 

375 

378 

381 

384 

387 

390 

393 

397

400

517 

521 

526 

530 

534 

539 

543 

548 

552 

556 

561 

565 

570 

574 

579 

583 

587 

592 

596 

600 

604 

608 

612 

617 

621 

625 

629 

634 

638 

642 

647

532 

533 

515 

496 

530 

562 

561 

531 

587 

646 

534 

540 

569 

509 

515 

523 

541 

518 

505 

509 

537 

487 

492 

638 

687 

615 

608 

594 

619 

629

587 

March

587 

589 

590 

515 

505 

553 

537 

664 

581 

618 

606 

565 

524 

579 

695 

691 

692 

611 

619 

622 

684 

655 

578 

638 

649 

698 

667 

649 

596 

634 

692

12.5 

11.8 

12.5 

13.2 

18.0 

17.0 

17.5 

15.5 

14.2 

13.2 

12.5 

12.0 

12.2 

13.0 

14.8 

14.8 

13.8 

14.0 

12.8 

12.8 

10.0 

10.5 

11.5 

10.0 

12.2 

12.5 

13.8 

14.0 

13.5 

12.8

14.8

11.5 

9.8 

11.0 

12.5 

13.2 

8.0 

9.5 

12.0 

13.5 

12.2 

9. 2

s!s

11.5 

12.5 

12.5 

12.8 

14.2 

15.1 

12.6 

14.1 

13.6 

14.4 

14.0 

13.8 

13.8 

14.4 

11.0 

13.1 

14.3 

14.2 

14.2

7.0 

9.3 

8.8 

7.7 

7.1 

7.7 

13.6 

8.7 

7.5 

10.2 

9.4 

8.1 

9.3 

6.2 

4.9 

4.7 

4.9 

5.2 

4.8 

4.4 

6.8 

5.9 

4.8 

8.3 

13.9 

13.4 

12.5 

10.9 

11.2 

11.2

7.5

6.2 

7.3 

7.7 

7.1 

6.0 

9.1 

7.7 

9.3 

8.3 

6.9 

8.9 

9.1 

8.8 

8.1 

10.2 

14.1 

12.2 

10.2 

13.9 

10.9 

12.5 

11.4 

8.4 

10.9 

9.7 

10.7 

10.6 

10.0 

10.3 

9.6 

10.7

February

305 

328 

134 

96 

299 

327 

394 

266 

385 

343 

419 

277 

369 

398 

398 

461 

463 

286 

78 

439 

468 

423 

465 

436 

514 

510

76 

304 

165 

491 

650 

439 

158 

526 

658 

654 

660 

690 

676 

687 

695 

666 

620 

656 

680 

699 

713 

610 

565 

692 

728 

676 

717 

658 

499 

203

403 

406 

408 

414 

417 

421 

425 

429 

433 

437 

441 

445 

449 

453 

457 

461 

465 

469 

474 

478 

483 

487 

491 

496 

500 

504

651 

655 

659 

663 

668 

672 

676 

680 

684 

688 

692 

696 

700 

703 

706 

710 

714 

718 

721 

724 

728 

731 

733 

736 

739 

742 

745 

748 

751 

754

569 

639 

649 

631 

604 

571 

606 

693 

642 

599 

588 

745 

625 

564 

565 

596 

592 

667 

665 

607 

588 

610 

677 

714 

523 

530

April

638 

625 

592 

509 

490 

527 

637 

584 

569 

586 

597 

589 

584 

571 

592 

662 

763 

719 

734 

664 

618 

728 

686 

538 

542 

578 

575 

606 

652 

720

17.5 

14.0 

13.5 

12.8 

13.0 

12.8 

14.0 

13.2 

14.5 

13.0 

13.5 

13.5 

14.0 

12.8 

13.8 

16.5 

15.8 

13.0 

12.5 

14.0 

16.0 

14.2 

14.8 

16.2 

12.0 

19.8

10.5 

11.2 

10.4 

11.0 

13.0 

11.4 

9.8 

13.6 

16.5 

20.2 

19.7 

20.6 

19.1 

20.3 

23.1 

18.7 

20.0 

18.8 

22.2 

27.4 

25.1 

18.1 

19.3 

15.4 

14.9 

15.9 

15.9 

15.8 

16.2 

15.1

4.6 

9.4 

13.8 

12.8 

12.6 

11.2 

11.2 

10.9 

10.9 

11.8 

12.3 

12.7 

13.1 

11.2 

12.0 

11.4 

11.3 

12.1 

12.9 

10.4 

10.6 

12.6 

12.2 

16.6 

8.5 

8.2

12.1 

10.1 

13.3 

8.8 

8.6 

9.0 

8.1 

10.0 

10.4 

8.8 

10.0 

7.8 

7.7 

6.8 

6.7 

13.0 

13.6 

14.0 

15.5 

11.1 

10.7 

13.6 

11.3 

8.8 

10.0 

10.8 

10.9 

11.6 

11.7 

12.0

Day

Daily radiation (cal cm-2 day-1)

•a

InI1

•r) >> 

S"M 

fllS •5,2 -3 

g 0 "

"Sw

•a

§

s 

<<

Daily

average

io0>o

* h

£ « 

-<

" §

tlf i&t •<

Daily radiation (cal cm-3 day-1)

•d

S3la1-

•ofr

•M'OS 

£j c5 §

tl'll 

H

0'sj

•a

•<i

Dally 

average

|g

H Q> 

8 t! +^ P

3*

|H «

&S21

> g j-

.Sa&S 

«}

SAN VICENTE, CALIF.— Continued 

1958— Continued

1— ....

2— — -

4... .... 

5— — .

7— .... 

8.———

g

10 

11 ————

12

13

14 

15

16———

17

10

19——

20 

21——

22—. - 

23——

24

25 

26 

27 

28 

29 

30

ol_ — _--

1— ....

2—....

3.— ...

4——— _

6.— —

6.— ...

7—— —

8— ... .

9— ....

10———

11———

12———- 

13- ——

14———-

15———.

16———

17——— 

18—— 

19—— 

20— ... 

21.——— 

22——— 

23———- 

24——— 

25—— 

26— — 

27.——— 

28—— 

29— — 

30— — 

31———.

May

232 

332 

701 

716 

716 

644 

415 

583 

267 

344 

416 

618 

630 

645 

662 

727 

727 

754 

737 

554 

720 

737 

739 

735 

752 

751 

581 

761 

559 

745

780 

717 

710 

735 

744 

698 

745 

750 

743 

724 

726 

710 

725 

703 

741 

744 

744 

744 

736 

707 

698 

671 

690 

728 

734 

676 

667 

692 

686 

627 

484

757 

760 

763 

766 

769 

771 

773 

775 

777 

778 

780 

782 

784 

786 

788 

790 

792 

794 

796 

797 

799 

801 

803 

804 

805 

807 

808 

809 

810 

811

Old

821 

820 

820 

819 

818 

817 

816 

815 

814 

813 

812 

811 

810 

808 

807 

806 

805 

804 

803 

802 

801 

800 

799 

798 

797 

796 

794 

792 

790 

788 

786

765 

772 

671 

665 

669 

757 

756 

755 

757 

703 

652 

625 

621 

616 

612 

676 

718 

691 

639 

743 

• 725 

653 

674 

658 

658 

641 

655 

626 

702 

724

July

697 

708 

711 

730 

717 

735 

733 

707 

737 

703 

694 

692 

722 

723 

696 

676 

682 

678 

668 

641 

701 

726 

697 

645 

685 

704 

717 

731 

713 

811 

836

15.6 

16.2 

19.2 

21.0 

20.0 

17.2 

16.0 

17.5 

16.7 

17.0 

15.2 

17.0 

15.8 

17.0 

20.3 

20.1 

17.6 

18.1 

17.4 

17.6 

17.9 

19.5 

20.4 

18.6 

18.4 

18.9 

18.9 

20.1 

19.0 

18.0

10. O

19.3 

18.9 

19.8 

19.8 

20.4 

20.6 

22.8 

25.1 

25.8 

26.7 

23.7 

21.5 

20.8 

19.8 

21.0 

20.6 

20.6 

20.8 

20.7 

20.4 

20.8 

20.3 

21.0 

20.8 

21.2 

20.3 

20.7 

22.6 

23.2 

27.0 

25.8

12.9 

13.5 

13.9 

12.8 

10.2 

12.5 

11.0 

11.1 

12.7 

12.6 

12.6 

11.9 

12.0 

13.1 

12.5 

13.7 

15.9 

13.9 

14.1 

17.5 

16.9 

14.1 

15.0 

15.3 

15.2 

13.1 

12.8 

13.7 

15.9 

14.8

10. u

14.8 

14.9 

15.7 

15.9 

15.5 

16.3 

16.0 

IS. 6 

13.7 

14.9 

16.9 

15.7 

17.3 

16.1 

16.1 

15.9 

14.8 

14.7 

15.1 

14.6 

15.4 

16.1 

15.9 

15.6 

15.9 

16.2 

16.7 

17.1 

16.8 

17.2 

17.6

June

689 

755 

769 

767 

719 

778 

783 

728 

761 

737 

674 

760 

775 

766 

654 

593 

709 

758 

763 

755 

623 

752 

766 

766 

745 

700 

751 

733 

718 

796

679 

708 

697 

676 

673 

653 

647 

664 

670 

665 

595 

628 

433 

569 

667 

634 

585 

632 

599 

603 

618 

616 

590 

538 

609 

596 

595 

568 

607 

625 

606

814 

815 

815

817 

81^ 

81?

sn

811 

821 

821 

821 82" 

82' 

822 

822 

822 

82? 

82* 

821 

82 1 

824 

82* 

82 ' 

82 < 

82"< 

82"* 

822 

822 

822 82"

78 < 

781? 

780 

778 

776 

774 

772 

77 •) 

788 

76*5 

763 

760 

7S7 

7S5 

7S2 

749 

746 

743 

740 

737 

73" 

731 

727 

72.4 

721 71* 

715 

711 

7C7 

7C3 7C«

722 

706- 

659 

584 

705 

686 

601 

611 

638 

727 

725 

707 

643 

607 

714 

742 

715 

679 

623 

656 

721 

694 

675 

700 

720 

715 

643 

704 

701 

697

August

732 

740 

720 

727 

749 

734 

722 

736 

759 

742 

757 

766 

801 

801 

793 

738 

789 

761 

800 

796 

734 

753 

752 

764 

757 

764 

763 

777 

741 

727 

741

17.8 

18.6 

19.0 

17.7 

17.8 

14.5 

17.5 

18.0 

17.8 

18.1 

17.4 

18.8 

19.4 

20.2 

20.4 

20.6 

20.8 

21.2 

20.2 

20.2 

21.0 

23.0 

22.1 

20.6 

20.8 

20.0 

21.4 

21.2 

19.4 

19.7

23.2 

24.4 

22.8 

21.6 

22.0 

21.9 

21.2 

23.1 

26.0 

26.0 

24.2 

24.4 

25.5 

24.8 

26.4 

24.2 

23.0 

23.3 

22.8 

22.6 

22.2 

21.6 

22.2 

22.3 

23.5 

23.0 

22.8 

23.0 

22.6 

21.9 

22.8

14.2 

14.2 

14.1 

14.3 

13.1 

13.9 

15.0 

14.6 

15.2 

13.6 

14.8 

14.5 

13.0 

14.6 

14.4 

15.7 

15.6 

15.3 

16.0 

14.9 

16.3 

15.1 

14.7 

15.9 

16.0 

16.7 

16.2 

16.8 

15.6 

14.2

18.4 

17.9 

17.5 

18.0 

18.6 

17.7 

17.8 

15.6 

15.0 

15.4 

18.1 

18.4 

18.1 

19.6 

20.1 

20.8 

19.8 

19.4 

19.5 

18.9 

18.9 

18.0 

18.3 

18.4 

19.3 

19.8 

19.8 

19.4 

18.3 

17.1 

18.3
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 127

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—'Continued

Day

Daily radiation (cal cm-2 day-')

•0

§8. M_g

I 8

r& ^S

•+•» CO

^u«

•S

CD

1

I

-4

Daily

average

io

J

© H

$«

i*«8;o

III

•<

Daily radiation 

(cal cm,-2 day-1)

•a

CD 

OQ fl i"°

>a >*>

•2 "in

ISs .3 or* •8-38 

W

0

S

a

1 -<

Daily 

average

4.5"

if®

® fcj £"§

•<

ll~g 23 -a

iSt •<

SAN VICENTE. CALIF.— Continued 

1958— Continued

I.......

3——_.

4.——— 

5.1———

6————

7--_-._.

g

10————

12......

13......

14...... 

15——.

16—...

17——.

18— —

19

20———

21———

22......

23———

24—...

oe

26— —

27— —

28———

29.——— on

31———

1-..—.

3——— 

4- __ .

5— — . 

6— —— 

7... .... 

8———— 

9 

10......

11 

12. 

13 

14 

15———

16...... 

17——— 

18——— 

19...... 

20..,.. . 

21... .. 

22..— . 

23...... 

24...... 

25——— 

26——— 

27——— 

28...... 

29——— 

30——. 

31......

September

593 

563 

568 

617 

586 

575 

490 

604 

612 

626 

634 

572 

605 

625 

592 

608 

587 

610 

587 

586 

577 

301 

124 

538 

603 

577 

541 

431 

538 

526

696 

692 

688 

684 

680 

676 

672 

668 

664 

660 

657 

653 

649 

645 

641 

638 

634 

630 

626 

621 

617 

612 

608 

603 

599 

595 

590 

586 

581 

577

706 

734 

739 

697 

748 

780 

788 

750 

716 

651 

663 

695 

672 

647 

647 

652 

649 

636 

676 

654 

668 

703 

677 

690 

596 

622 

673 

712 

688 

709

22.2 

21.7 

22.1 

22.6 

25.0 

28.5 

27.6 

27.1 

26.6 

23.8 

28.6 

20.5 

20.0 

23.2 

26.9 

28.2 

27.0 

25.7 

27.3 

26.7 

21.9 

18.6 

18.0 

20.0 

22.3 

25.6 

25.2 

24.4 

23.2 

22.9

18.3 

18.2 

17.9 

17.1 

16.9 

17.3 

18.0 

18.7 

14.8 

14.9 

10.8 

16.4 

14.3 

13.8 

8.7 

8.3 

8.9 

10.8 

10.6 

9.4 

14.7 

16.5 

15.8 

16.9 

7.9 

6.2 

10.1 

13.0 

15.0 

17.0

November

406 

437 

429 

412 

403 

402 

388 

377 

388 

138 

214 

248 

386 

342 

299 

401 

400 

394 

391 

371 

362 

387 

379 

286 

199 

145 

325 

359 

362 

355

441 

437 

433 

429 

425 

422 

418 

414 

410 

407 

404 

400 

397 

394 

391 

388 

385 

382 

379 

376 

374 

371 

368 

365 

363 

361 

358 

356 

354 

352

547 

566 

565 

580 

605 

608 

631 

611 

637 

739 

665 

646 

565 

689 

633 

429 

475 

490 

521 

550 

608 

574 

565 

683 

699 

652 

575 

495 

494 

496

18.6 

19.8 

20.8 

20.0 

20.2 

19.0 

17.3 

16.7 

15.7 

15.7 

13.2 

14.9 

15.4 

14.6 

12.3 

8.0 

9.4 

12.5 

14.9 

16.5 

17.8 

17.8 

17.4 

17.4 

16.8 

15.2 

14.7 

16.4 

17.5 

16.8

6.9 

6.2 

5.8 

7.4 

9.0 

11.4 

13.1 

14.1 

13.2 

14.0

11.4 

11.7 

11.2

7.5 

5.7 

4.8

October

375 

541 

444 

521 

521 

359 

475 

495 

432 

454 

473 

470 

479 

486 

482 

500 

487 

462 

476 

477 

464 

449 

145 

256 

456 

429 

385 

423 

442 

446 

308

573 

568 

564 

560 

556 

551 

547 

543 

538 

534 

529 

525 

520 

516 

512 

508 

504 

500 

496 

491 

487 

483 

479 

474 

469 

465 

462 

458 

454 

450 

445

704 

682 

665 

668 

726 

710 

695 

698 

697 

721 

641 

682 

686 

680 

684 

652 

649 

625 

677 

693 

685 

678 

708 

709 

637 

655 

651 

587 

551 

563 

585

25.0 

29.2 

29.2 

28.5 

21.0 

20.6 

20.2 

20.6 

19.3 

19.3 

19.9 

21. 7 

2s!7 

28.4 

30.4 

31.6 

29.8 

27.0 

21.4 

18.7 

19.4 

19.3 

17.1 

16.6 

16.9 

17.5 

18.0 

19.3 

21.9 

21.4 

19.2

15.6 

10.1 

8.2 

8.4 

17.1 

17.2 

15.2 

16.7 

16.9 

16.4 

16.2 

15.7 

11.2 

10.8 

9.1 

6.2 

5.7 

7.5 

13.5 

15.3 

15.1 

14.3 

14.3 

13.8 

13.2 

13.6 

14.5 

14.0 

7.1 

7.2 

7.4

December

353 

349 

338

315 

326 

295 

305 

319 

321 

310 

305 

323 

315 

340 

334 

325 

302 

311 

266

295 

313 

322 

313 

297 

321 

343 

346 

338

350 

348 

346

341 

339 

337 

336 

335 

334 

333 

332 

331 

330 

329 

329 

328 

328 

328 

327

327

327 

327 

327 

328 

328 

329 

329 

330

493 

551

548

571 

508 

575 

572 

577 

592 

601 

585 

547 

506 

490 

498 

496 

521 

519 

576

580 

523 

536 

572 

587 

583 

504 

495 

525

15.9 

18.1 

20.2

13.0 

13.7 

13.6 

14.8 

20.0 

21.2 

19.4 

17.8 

20.2 

21.0 

18.7 

18.0 

16.9 

13.8 

14.9 

14.2

13.4 

12.1 

12.3 

12.8 

14.0 

14.4 

16.4 

15.2 

15.8

10.9 

9.4 

10.5 

10.6 

12.1 

12.5 

6.9 

5.1 

5.4

Day

Daily radiation (cal cm~z day-i)

T31*§"3 

S"

>rt !>> 

<oM •M Of

'•g-fll 

W

a

1 

^

Dally 

average

SE

£"8

•<

<5 §2" ^si £nS 

-<

Daily radiation 

(cal cm-8 day-')

1*

•o & 

8%

w& ° 

W

•s

o> 

a

•<

Daily

average

io^

3*

&S8S1 3°£*fB

SAN VICENTE, CALIF.— Continued 

1959

!„ ...

2... ...

3.. _ ..

4...——

5————

6.. __ .

7.. __ .

8- __ .

9...— -

10———

11———

12———

13———

14——— 

15———

16———

17———

18———

19———

20.———

21———

22———

23.. ...

24. __ .

25......

26———

27———

28———

29..—-

on

31.——

1 __ _

2_^_— . 

3———— 

4.. ....

5 ___ .

6——— _

7—— - 

8.. ..... 

9———— 

10.———

11 

12 

13 

14..— _ 

15...... 

16——— 

17——— 

18..—. 

19——— 

20..— . 

21—... 

22..— . 

23——— 

24——— 

25——— 

26.. _ _

27——— 

28——— 

29——— 

30——— 

31———

January

329 

202 

283 

337 

121 

214 

319 

331 

302 

241 

335 

280 

336 

352 

355 

324 

359 

300 

211 

262 

356 

368 

385 

381 

382 

340 

394 

398 

356 

393 

421

331 

332 

333 

335

337 

338 

339 

341 

343 

345 

347 

349 

351 

353 

355 

357 

359 

361 

363 

366 

369 

372 

375 

378 

381 

384 

387 

390 

393 

397 

400

609 

692 

606 

601 

664 

653 

590 

607 

610 

632 

600 

578 

580 

577 

579 

593 

592 

619 

690 

678 

515 

545 

550 

544 

572 

588 

572 

535 

557 

535 

547

14.4 

13.6 

12.7 

12.1 

12.0 

13.4 

13.5 

14.4 

14.7 

14.9 

17.8 

17.0 

13.8 

14.7 

17.0 

18.4 

19.4 

16.4 

11.1 

14.2 

14.0 

13.5 

14.5 

14.2 

12.1 

14.2 

15.8 

13.8 

14.6 

11.8 

12.2

8.1 

10.6 

9.7 

8.1 

9.1 

11.4 

9.6 

9.7 

9.2 

9.5 

10.2 

10.8 

11.5 

9.8 

8.1 

7.1 

6.9 

9.0 

11.0 

9.4 

3.0 

5.3 

12.2 

9.3 

9.5 

11.4 

5.3 

7.5 

7.5 

8.3 

6.4

March

520 

458

KJO

541 

550 

508 

554 

495 

560 

563 

562 

572 

524 

601 

602 

465 

595 

563 

565 

586 

568 

466 

544 

634 

631 

590 

629 

656 

515 

642

517 

521

530

534 

539 

543 

548 

552 

556 

561 

565 

570 

574 

579 

583 

587 

592 

596 

600 

604 

608 

612 

617 

621 

625 

629 

634 

638 

642 

647

605 

610

525 

535 

595 

566 

594 

592 

551 

495 

644 

666 

548 

525 

545 

630 

667 

609 

580 

679 

677 

601 

551 

605 

691 

544 

548 

745 

677

18.8 

17.8

1ft 7

18.0 

15.0 

12.8 

15.6 

17.5 

18.2 

20.3 

19.7 

15.6 

15.8 

18.4 

19.0 

18.1 

14.6 

16.1 

19.9 

18.9 

14.4 

14.1 

13.6 

14.4

15.6 

15.4 

14.6 

14.8 

19.4

7.4 

10.2

11.6

12.0 

11.8 

11.2 

11.5 

9.2 

9.2 

6.5 

5.3 

9.4 

12.7 

7.0 

5.0 

8.8 

10.1 

9.9 

7.5 

9.4 

12.3 

11.8 

9.9 

6.2

10.7 

10.6 

10.5 

11.9 

13.2

February

424 

419 

413 

421 

415 

415 

158 

111 

438 

404 

85 

377 

463 

435 

180 

125 

251 

388 

421 

443 

131 

340 

505 

507 

519 

516 

519 

521

403 

406 

408 

414 

417 

421 

425 

429 

433 

437 

441 

445 

449 

453 

457 

461 

465 

469 

474 

478 

483 

487 

491 

496 

500 

504 

508 

512

563 

549 

496 

550 

544 

620 

721 

638 

547 

638 

686 

554 

506 

502 

628 

721 

709 

658 

635 

606 

611 

539 

562 

526 

521

K

525

1LC 

12. C 

11.2 

11.1 

12.1 

12.3 

11. £ 

9.f 

9.7 

10. £ 

11.2 

10.2 

10.? 

10.7 

13.4 

14. C 

14. C 

13.5 

13.2 

11.7 

9.C 

9.£ 

11.1 

13. € 

14.7 

15. f 

16. £ 

16. €

5.6 

6.5 

5.5 

7.4 

9.3 

10.1 

11.6 

11.3 

7.5 

8.8 

11.5 

9.4 

7.3 

5.9 

5.9 

15.0 

13.8 

10.6 

11.4 

9.5 

9.2 

9.0 

8.4 

7.6 

5.8 

5.0 

7.0 

7.7

April

657 

647 

528 

406 

379 

222 

221 

566 

655 

654 

700 

698 

691 

656 

651 

576 

280 

307 

283 

613 

626 

656 

565 

568 

443 

514 

734 

733 

728 

584

651 

655 

659 

663 

668 

672 

676 

680 

684 

688 

692 

696 

700 

703 

706 

710 

714 

718 

721 

724 

728 

731 

733 

736 

739 

742 

745 

748 

751 

754

605 

602 

627 

643 

670 

727 

737 

735 

734 

619 

563 

554 

659 

688 

706 

725 

735 

723 

746 

706 

698 

624 

670 

664 

664 

656 

691 

633 

640 

718

22.4 

21. £ 

19.7 

17.8 

14. S 

13. S 

14.7 

17.1 

17.4 

19.? 

19. f 

17.0 

19.0 

16.2 

14. e 

15.0 

14. £ 

14.1 

14. S 

17.3 

18.1 

18.8 

17.7 

16.2 

15.8 

16.3 

19.1 

21.3 

22.1 

17.4

11.0 

11.0 

11.6 

12.9 

13.3 

13.0 

13.4 

13.6 

14.1 

12.0 

10.4 

6.3 

12.9 

13.3 

10.8 

11.0 

11.3 

11.1 

12.1 

13.2 

14.2 

13.9 

14.4 

12.6 

12.0 

15.2 

14.7 

13.1 

13.9 

15.3
128 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average G-ir temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation 

(cal cm.-2 day-i)

731" i1

frt t>> 

aM +i m

to "3 M 

W

o

I 

I

^

Daily 

average

£p

ii o§ 

•<

u, y> 

I*

« TM2 

T2g .fcinfi- 

•<

Daily radiation 

(cal cmr2 day-i)

3 b

CO .2 

CO 'fS I 8

»rt »>* 

•g vM?

gc! el

.p v^ •£•33

w

_o

a 

n

I•<

Daily 

average

feO

IB<B b

ij"c3 •<

IH c

g^S T £ a in-H- 

•<

SAN VICENTE, CALIF.— Continued 

1959— Continued

1———

2.......

3- _ _.

4———— 5- _ -

7- _ -

g

10

11

19

10

14

15

Ifi

17———

18.——— 

19

20———

21......

99

OD

24

25......

29

Q/\

31......

1——...

3.......

4.......

5 ____

6———— 

7-..—

9———— 

10 

11 

12 

13 

14 

15———

16 

17 

18——— 

19—... 

20—... 

21——.. 

22..—. 

23—... 

24- —— 

25——— 

26.——— 

27—... 

28——— 

29——— 

30——— 

31———

May

214

584

720 

758 

752 

737 

530 

700 

655 

577 

626 

740 

567 

716 

670 

654 

610 

654 

666 

392 

634 

278 

448 

583 

695 

755 

694 

770 

700

757 

760 

763 

766 

769 

771 

773 

775 

777 

778 

780 

782 

784 

786 

788 

790 

792 

794 

796 

797 

799 

801 

803 

804 

805 

807 

808 

809 

810 

811

763 

627

545 

605 

602 

744 

693 

724 

686 

646 

704 

721 

679 

735 

750 

671 

664 

746 

748 

746 

719 

736 

775 

671 

677 

725 

694 

685

16.1 

13.6 

12.0 

14.0 

17.8 

17.0 

18.6 

15.3 

16.8 

17.4 

17.1 

18.4 

18.8 

17.4 

17.5 

17.2 

16.8 

16.7 

16.0 

16.4 

15.6 

16.5 

15.2 

16.1 

17.3 

17.3 

17.1 

17.8 

18.2 

18.2

13.8 

9.5 

9.5 

9.5 

8.7 

12.0 

13.3 

12.2 

12.7 

13.9 

13.9 

13.8 

14.2 

14.1 

13.7 

13.7 

13.2 

13.2 

13.2 

13.4

10.9 

11.0 

12.9 

13.5 

13.1 

13.0 

14.0 

14.5 

14.5

July

725

732 

739 

738 

761 

758 

632 

677 

727 

724 

682 

733 

721 

716 

706 

701 

534 

659 

676 

701 

697 

678 

670 

696 

651 

710 

688 

565 

569

821

819 

818 

817 

816 

815 

814 

813 

812 

811 

810 

808 

807 

806 

805 

804 

SOS 

802 

801 

800 

799 

798 

797 

796 

794 

792 

790 

788 

786

738

725 

687 

669 

660 

651 

768 

742 

697 

708 

734 

745 

701 

731 

775 

727 

736 

782 

747 

765 

759 

758 

731 

701 

707 

721 

793 

789 

791

25.4

27.5

24.1 

23.2 

23.0 

24.2 

25.7 

27.8 

31.9 

29.1 

26.1 

22.6 

22.9 

22.5 

23.8 

23.4 

23.1 

22.1 

21.3 

21.2 

23.1 

25.2 

27.7 

26.9 

23.1 

21.4 

22.3 

23.3 

25.0 

29.0

20.9

20.7 

16.1 

20.6 

21.9 

16.8 

13.3 

11.8 

9.3 

14.4 

18.6 

18.3 

19.3 

20.1 

19.9 

19.3 

20.0 

18.9 

18.5 

20.1 

20.6 

18.6 

20.5 

20.1 

19.2 

17.7 

17.9 

19.1 

17.9

June

751 

727 

706 

679 

689 

632 

728 

773 

732 

759 

760 

716 

703 

728 

761 

789 

788 

791 

740 

743 

740 

733 

751 

742 

724 

707 

694 

721 

765 

730

814 

815 

816 

817 

818 

818 

819 

819 

820 

820 

820 

821 

821 

822 

822 

822 

823 

823 

824 

824 

824 

824 

824 

824 

823 

823 

822 

822 

822 

821

671 

640 

696 

712 

698 

729 

684 

720 

667 

680 

644 

666 

715 

685 

610 

690 

586 

611 

643 

668 

707 

684 

682 

701 

754 

792 

821 

689 

665 

720

20.2 

19.8 

19.0 

19.1 

18.5 

19.0 

18.7 

18.3 

18.0 

18.2 

19.2 

20.0 

21.8 

22.6 

21.0 

21.5 

22.0 

22.5 

21.3 

23.4 

25.1 

25.0 

23.0 

20.5 

19.2 

19.8 

19.6 

19.0 

20.0 

23.5

16.0 

15.5 

15.5 

15.3 

15.7 

15.9 

14.6 

14.7 

14.9 

15.3 

16.1 

17.4 

18.5 

17.2 

16.6 

15.5 

14.2 

14.5 

16.8 

17.9 

17.6 

17.6 

18.9 

16.9 

16.1 

16.1 

16.7 

15.9 

15.9 

19.7

August

599 

566 

698 

724 

707 

649 

619 

664 

669 

663 

636 

649 

658 

685 

664 

596 

514 

611 

300 

700 

694 

494 

615 

443 

274 

481 

667 

578 

676 

664

784 

782 

780 

778 

776 

774 

772 

770 

768 

766 

763 

760 

757 

755 

752 

749 

746 

743 

740 

737 

734 

731 

727 

724 

721 

718 

715 

711 

707 

703

794 

719 

716 

714 

673 

740 

765 

781 

749 

733 

725 

722 

779 

734 

728 

715 

761 

781 

774 

662 

717 

810 

806 

838 

839 

804 

751 

765 

692 

696

28.4 

24.6 

23.7 

22.6 

22.3 

22.4 

25.0 

27.6 

27.4 

25.1 

23.3 

23.4 

22.9 

21.8 

21.6 

21.6 

21.0 

21.2 

19.8 

20.4 

22.1 

27.4 

24.8 

23.2 

21.6 

22.0 

22.4 

21.4 

22.6 

25.6

17.5 

16.9 

16.3 

17.0 

16.7 

18.2 

18.3 

16.6 

13.4 

18.0 

18.3 

18.5 

18.2 

16.6 

16.4 

16.8 

17.3 

15.9 

14.7 

14.3 

15.7 

15.7 

19.2 

20.7 

21.5 

20.0 

17.7 

18.0 

16.9 

15.2

Day

Daily radiation 

(cal cm-2 day-i)

73

05 5!

CO rt 03 8

s

« >> %M

.5 g -3

to o w 

H

I 

a 

a

I

^

Daily 

average

iQ

£ o§ •< fit

Daily rad'.ntion 

(cal cm-* day-')

73 

V

en w 

i1

« >> 

+* ®,Mw

B ®,§ '•£•111 

N

u

S3 a

1%

DaiTy 

average

if

§ H 

£«

<!

$i~ >$s i&s

<!

SAN VICENTE, CALIF.— Continual 

1959— Continued

I———.

2... ....

3— ....

4.. _ -

5—— —

6———

7———

8———

9———

10———

11———

12———

13———

14———

15———

16———

17———

18———

19———

20———

21..——

22———

23———

24———

25———

26———

27———

28———

29———

30———

31———

September

666 

659 

620 

636 

653 

664 

606 

622 

625 

337 

335 

310 

578 

526 

586 

533 

598 

598 

544 

476 

587 

550 

586 

569 

556 

549 

533 

350 

487 

146

696 

692 

688 

684 

680 

676 

672 

668 

664 

660 

657 

653 

649 

645 

641 

638 

634 

630 

626 

621 

617 

612 

608 

603 

599 

595 

590 

586 

581 

577

749 

721 

723 

646 

651 

734 

702 

736 

693 

806 

851 

823 

779 

809 

697 

716 

745 

663 

778 

749 

716 

719 

691 

706 

709 

745 

763 

803 

781 

775

22.7 

22.3 

21.8 

22.1 

23.8 

22.1 

20.3 

21.3 

23.7 

25.7 

30.3 

23.7 

24.3 

22.3 

18.9 

17.3 

19.9 

21.1 

21.4 

20.6 

19.2 

19.6 

19.4 

20.1 

20.6 

19.3 

19.1 

19.9 

20.0 

16.6

16.6 

17.0 

16.6 

16.6 

16.6 

17.5 

16.5 

16.7 

17.1 

19.7 

17.1 

22.6 

22.3 

18.8 

14.4 

13.5 

14.2 

16.7 

17.2 

17.2 

14.5 

13.9 

13.7 

15.9 

16.3 

15.2 

15.0 

15.3 

15.6 

14.1

October

383 

539 

559 

553 

538 

542 

488 

518 

475 

496 

487 

476 

484 

536 

517 

494 

496 

506 

445 

487 

424 

457 

455 

448 

360 

115

573 56r>

5&t 

56(1 

556 55' 

54? 

543 

533 53' 

521 

52o 

520 

516 

512 50f< 

50" 

500 

493 49' 

487 

48ft 

47!) 

471 

460 

46o

697 

631 

607 

620 

635 

662 

694 

611 

659 

665 

667 

681 

707 

607 

621 

637 

659 

688 

781 

674 

675 

650 

659 

697 

807 

821

16.3 

18.6 

20.1 

21.8 

21.6 

18.6 

18.5 

18.7 

19.1 

19.7 

20.5 

19.6 

23.2 

27.0 

26.6 

24.3 

19.9 

18.2 

17.6 

17.4 

17.2 

20.6 

22.5 

20.9 

18.3 

18.2

13.8 

14.0 

11.4 

10.2 

10.9 

12.8 

13.2 

14.6 

15.4 

15.2 

16.5 

16.6 

11.4

13.8 

14.9 

15.0 

13.2 

14.0 

14.0 

12.4 

15.3 

16.3 

16.3

ROOSEVELT RESERVOIR, ARIZCNA

1958

1.. __ 

2——— 

3 

4.......

5- _ ..

6———— 

7 

8— —— 

9— —— 

10 

11 

12

13 

14 

15 

16———

17——— 

18——— 

19——— 

20——— 

21...... 

22——— 

23— — 

24——— 

25——— 

26——— 

27——— 

28——— 

29——— 

30——— 

31———

April

425 

639 

492

442 

663 

648 

548 

550 

650 

648 

658 

515 

673 

689 

668 

317 

649 

667 

667 

651 

702 

703 

681 

669 

689 

694 

675 

710 

690 

715

644 

648 

652 

656 

660 

664 

668 

672 

676 

680 

684 

688 

692 

696 

700 

704 

708 

712 

716 

719 

723 

726 

729 

733 

737 

740 

743 

746 

749 

752

643 

635 

638 

557 

558 

596 

601 

629 

672 

629 

625 

619 

633 

635 

696 

680 

717 

714 

737 

720 

719 

696 

639 

659 

641 

631 

644 

696 

697 

706

15.4 

13.7 

13.9 

10.8 

12.1 

15.3 

13.5 

12.5 

17.9 

17.1 

17.8 

15.2 

16.1 

9.2 

20.8 

16.7 

19.4 

22.3 

24.1 

25.2 

25.6 

26.3 

22.3 

19.9 

20.7 

20.7 

21.5 

22.3 

22.3 

22.3

9.6 

8.5 

10.1 

7.8 

7.0 

7.6 

8.4 

10.1 

9.3 

8.7 

8.6 

8.6 

9.3 

4.4 

8.6 

14.2 

13.5 

11.8 

10.8 

9.7 

9.7 

8.4 

5.7 

7.9 

7.3 

6.9 

7.0 

5.9 

6.4 

7.8

May

715 

650 

532 

684 

675 

685 

500 

602 

692 

603 

600 

716 

700 

725 

728 

730 

740 

731 

698 

620 

616 

742 

720 

728 

684 

696 

675 

727 

688 

367 

731

755

75? 

781 

763 76- 

76' 

770 

772 

774 

773 

773 78' 

783 78- 

78' 

781 79' 

79^ 79" 

793 

79i 

800 

80?

sor»

80'. 

803 

80^ 

80^ 

810 

811 

813

706 

704 

690 

720 

752 

764 

704 

697 

719 

709 

718 

682 

687 

684 

699 

710 

718 

731 

750 

748 

744 

731 

723 

747 

738 

731 

804 

790 

776 

781 

736

22.3

21.7 

19.5 

22.2 

27.7 

27.2 

24.9 

23.3 

23.8 

24.0 

22.6 

19.9 

21.3 

21.5 

23.4 

24.5 

25.1 

26.1 

28.1 

27.7 

27.8 

26.2 

26.6 

27.0 

27.7 

26.2 

31.5 

33.1 

31.9 

28.9 

28.7

7.8 

9.2 

10.9 

12.4 

8.2 

9.7 

5.5 

5.6 

8.2 

7.0 

11.2 

7.1 

6.0 

4.7 

4.4 

5.0 

5.1 

6.1 

6.8 

8.1 

6.6 

7.4 

6.8 

7.3 

7.9 

4.9 

10.4 

9.0 

8.9 

12.1 

9.6
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAE RADIATION 129

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (cal cm-2 day-i)

•8

*%00 TO

P

»rt ^»

1*

S C8 C3 

.3^-3 

"£ 0 CO w

I 

8 

| 

<

Daily 

average

£?nS^

S» 

S3 

.las «J

H-

>g£ '•<*a cl

Daily radiation (cal cm-2 day-i)

M.§ c3 7? Is

•rt ^> 

?•» 

| c3 C8 3-3-3

to « M

W

«

s

a

| 

<

Daily 

average

feOS,°^

H 0> Isa* <j!i- *£•§ 

i aS «J

ROOSEVELT RESERVOIR, ARIZONA— Continued 

1958— Continued

1.. __

2— _ . 

3...——

4. 5.. __ .

6.......

7. __ -

g

1011

19

10

15

17

18——— 

19

20.... ..

21.. — .

99

23-_____

oe

Oft

27———

28..— .

9Q

30———

31... ...

1.... ...

2————

3.. __ -

4.. _ ..

5...——

6— ——

7. __ ..

8.-——

9————

10.. ....

11———

12.. _ -

13.. __

14———

15———

16.... -_

17——— 

18——— 

19——— 

20..—— 

21——— 

22——— 

23——— 

24 ...... 

25.. _ - 

26——— 

27——— 

28..-__ 

29——— 

30——— 

31———

June

748 

757 

746 

620 

720 

743 

740 

730 

760 

780 

773 

766 

778 

715 

572 

624 

719 

719 

652 

148 

535 

715 

716 

724 

765 

741 

719 

715 

712

814 

816 

817 

813 

819 

820 

820 

821 

822 

822 

823 

823 

824 

824 

824 

825 

825 

825 

825 

826 

826 

826 

826 

826 

826 

825 

825 

824 

824

712 

702 

713 

760 

854 

858 

784 

762 

761 

772 

698 

682 

683 

811 

806 

847 

837 

836 

859 

780 

837 

860 

869 

792 

739 

778 

818 

868 

875

27.3 

27.7 

28.1 

28.7 

33.1 

31.9 

30.0 

27.7 

27.4 

28.3 

27.8 

27.8 

26.9 

29.7 

29.9 

32.8 

33.4 

33.4 

32.7 

25.7 

24.1 

28.9 

32.4 

33.1 

30.5 

31.2 

32.8 

33.6 

31.8

10.2 

9.6 

10.1 

11.2 

13.2 

11.1 

9.8 

9.4 

9.6 

9.9 

10.7 

10.0 

10.2 

11.0 

11.4 

17.6 

18.3 

18.6 

19.9 

24.1 

26.2 

25.8 

22.5 

15.9 

13. 1 

14.3 

16.4 

21.3 

21.0

August

693 

600 

605 

493 

668 

400 

686 

620 

568 

625 

611 

587 

660 

611 

640 

640 

415 

. 645 

435 

555 

640 

600 

600 

600 

600 

610 

575 

490 

590 

615 

610

786 

784 

782 

780 

778 

776 

773 

770 

767 

764 

761 

758 

755 

752 

749 

746 

743 

740 

736 

733 

730 

727 

724 

720 

717 

714 

710 

707 

704 

700 

696

877 

904 

897 

875 

887 

878 

853 

852 

874 

877 

889 

869 

864 

893 

850 

853 

814 

848 

827 

834 

844 

848 

840 

839 

848 

845 

836 

821 

829 

844 

843

31.1 

31.6 

32.8 

31.0 

30.9 

28.9 

30.6 

31.3 

31.1 

30.9 

31.0 

31.1 

30.1 

31.2 

29.3 

31.2 

27.2 

30.8 

29.0 

28.6 

29.8 

31.0 

29.7 

29.8 

31.4 

32.7 

31.0 

28.6 

29.1 

30.8 

31.3

21.9 

20.0 

21.9 

20.2 

21.1 

24.1 

24.9 

22.4 

21.9 

21.4 

26.2 

25.2 

23.4 

24.7 

25.3 

22.4 

24.5 

22.0 

23.8 

24.5 

23.0 

22.4 

23.0 

22.7 

21.6 

18.4 

20.3 

22.5 

22.1 

21.6 

20.7

July

686 

740 

742 

650 

723 

716 

717 

728 

776 

739 

725 

727 

729 

733 

708 

616 

490 

778 

763 

787 

761 

386 

709 

709 

586 

754 

688 

430 

645 

691

823 

822 

822 

821 

821 

820 

819 

818 

817 

816 

815 

814 

813 

812 

811 

810 

809 

808 

807 

806 

804 

802 

800 

798 

796 

794 

792 

790 

789 

788

976 

951 

927 

973 

989 

981 

990 

862 

877 

869 

870 

883 

878 

841 

872 

911 

860 

859 

755 

751 

781 

686 

874 

877 

725 

842 

878 

842 

889 

863

32.5 

32.8 

32.2 

32.2 

33.1 

34.8 

35.6 

36.3 

37.6 

38.4 

37.3 

36.9 

36.9 

36.1 

34.7 

33.4 

30.4 

32.2 

31.4 

31.8 

32.1 

29.9 

30.6 

32.2 

30.8 

32.0 

32.6 

27.6 

29.9 

31.7

19.0 

16.9 

14.9 

18.7 

20.3 

J8.3 

16.9 

16.6 

16.5 

17.4 

20.2 

20.9 

18.7 

16.4 

20.0 

23.5 

19.6 

15.5 

13.1 

13.2 

14.6 

18.3 

21.8 

21.9 

19.4 

17.0 

20.8 

28.9 

27.4 

24.1

September

600 

610 

595 

460 

600 

600 

585 

525 

565 

555 

520 

225 

515 

605 

595 

585 

565 

562 

583 

586 

583 

323 

457 

548 

563 

470 

376 

465 

455 

520

693 

689 

686 

682 

678 

674 

670 

666 

662 

657 

653 

648 

644 

639 

635 

631 

626 

622 

617 

613 

608 

604 

600 

595 

591 

586 

822 

582 

578 

573

836 

832 

817 

799 

798 

807 

814 

828 

822 

820 

809 

778 

751 

727 

739 

753 

771 

774 

724 

705 

712 

725 

791 

666 

686 

722 

671 

726 

707 

716

31.8 

30.5 

30.4 

29.0 

29.0 

30.4 

30.7 

30.6 

30.6 

29.4 

28.0 

23.5 

23.8 

22.7 

24.8 

26.0 

27.5 

27.3 

27.2 

26.8 

27.4 

23.7 

23.0 

19.9 

21.0 

21.1 

18.4 

21.3 

19.9 

21.3

18.5 

19.9 

17.3 

17.8 

16.0 

15.3 

16.2 

19.1 

18.2 

20.1 

20.9 

26.1 

16.2 

12.8 

11.9 

12.5 

13.7 

13.7 

11.2 

10.2 

10.4 

14.2 

15.9 

12.5 

9.5 

10.7 

14.0 

16.7 

15.2 

14.0

Day

Daily radiation (cal cm-2 day-i)

•d 

§5 fe 00 TO

f§

II

Us 'S'3 co W

o•c

CD •a

•<i

Daily 

average

!?n=-^

A* <j

&S2

31$ n~

Daily radiation (cal cm-2 day-i)

•d

il Is

•d E>

OJ4 •U CO

•I-lo

M « CO 

W

o

1 

&

| 

<

Daily

average

£o nSS»H 5

.fcj"c3

-<j

t, o> 

.a IPft^ 

<

ROOSEVELT RESERVOIR, ARIZONA— Continued 

1958— Continued

1. __ .

2....... 

3... ....

4.......

5.......

6— ....

7....... 

8.......

9.......

10......

11———

12......

13-....

14——.

15..

16......

17......

18......

19......

20......

21......

22.......

23———

24———

25— —

26———.

27— —

28— —

29———

30———-

31——

1— ....

2.......

3—— —

4———

5— ... -

6— — .

7— — -

8— ....

9— ....

10———

11— —

12———

13— —

14— —

15———

16——.

17——— 

18...... 

19——— 

20...... 

21...... 

22... ... 

23——— 

24...... 

25——— 

26——— 

27——— 

28——— 

29——— 

30——— 

31......

October

510 

520 

490 

330 

160 

400 

480 

490 

490 

480 

451 

478 

475 

491 

491 

486 

473 

473 

404 

424 

451 

471 

389 

356 

440 

448 

276 

404 

376 

352 

435

565 

560 

556 

551 

547 

542 

538 

534 

529 

525 

521 

516 

512 

507 

503 

499 

494 

490 

485 

481 

476 

472 

468 

464 

460 

456 

452 

448 

444 

440 

436

735 

723 

718 

711 

688 

711 

740 

731 

718 

720 

678 

687 

716 

673 

651 

637 

627 

636 

624 

661 

612 

573 

646 

657 

615 

553 

605 

623 

615 

575 

522

23.4 

22.7 

23.2 

22.1 

15.7 

17.5 

19.7 

20.6 

20.2 

21.0 

21.4 

22.4 

23.1 

22.5 

22.7 

21.3 

20.8 

20.2 

19.9 

10. 1 

17.8 

8.3 

17.8 

19.3 

17.7 

16.0 

15.4 

17.1 

13.9 

10.9 

11.2

14.2 

13.1 

11.5 

14.0 

21.8 

20.6 

21.9 

18.5 

16.5 

15.6 

16.0 

16.6 

16.7 

15.8 

14.1 

14.0 

13.5 

13.9 

14.0 

14.1 

12.9 

5.5 

12.7 

14.8 

14.5 

12.5 

12.7 

15.1 

13.7 

10.9 

11.3

December

323 

325 

317 

319 

301 

326 

316 

316 

287 

322 

329 

311 

328 

330 

332 

318 

328 

311 

302 

271 

310 

242 

304 

306 

314 

314 

323 

243 

318 

320 

329

340 

338 

336 

334 

332 

330 

328 

326 

324 

323 

322 

321 

320 

319 

318 

317 

317 

316 

316 

315 

315 

315 

315 

315 

316 

316 

317 

317 

318 

319 

320

448 

453 

477 

464 

455 

456 

455 

469 

500 

476 

481 

489 

449 

414 

422 

417 

431 

449 

420 

455 

459 

496 

471 

441 

437 

434 

456 

449 

414 

412 

407

8.9 

9.6 

11.8 

10.3 

9.5 

9.3 

9.2 

9.0 

9.5 

10.2 

9.9 

10.1 

9.5 

8.7 

6.8 

6.0 

6.3 

8.7 

7.6 

7.7 

8.0 

8.6 

7.5 

7.0 

6.4 

6.2 

6.8 

6.3 

5.2 

4.6 

4.2

6.3 

5.4 

4.3 

5.6 

6.3 

6.2 

6.2 

6.1 

6.6 

5.7 

5.2 

6.5 

5.0 

4.0 

4.3 

4.2 

4.3 

4.2 

4.9 

5.2 

5.5 

6.1 

5.7 

5.7 

5.4 

5.0 

4.8 

5.3 

3.8 

4.2 

3.8

November

333 

438 

438 

425 

398 

406 

398 

403 

392 

358 

286 

315 

387 

372 

140 

61 

297 

370 

365 

360 

302 

295 

346 

314 

242 

113 

248 

344 

338 

321

432 

428 

424 

420 

416 

412 

408 

405 

401 

397 

394 

390 

387 

384 

381 

378 

375 

372 

369 

366 

364 

361 

358 

355 

352 

350 

348 

346 

344 

342

556 

542 

543 

541 

558 

563 

565 

570 

573 

571 

646 

573 

532 

541 

483 

451 

445 

337 

41? 

467 

507 

544 

507 

515 

588 

655 

581 

437 

449 

475

11.4 

12.9 

13.2 

13.6 

14.8 

15.0 

15.1 

15.6 

15.4 

15.1 

14.8 

12.6 

11.5 

11.8 

8.0 

1.0 

1.3 

1.7 

4.7 

8.4 

9.7 

10.7 

11.4 

11.5 

12.1 

11.8 

12.9 

10.2 

8.2 

9.0

10.1 

11.3 

10.8 

11.4 

11.6 

12.1 

11.4 

14.8 

15.1 

15.2 

14.5 

13.4 

12.2 

12.6 

9.9

5.1 

4.8 

5.9 

6.7 

7.3 

8.0 

8.0 

9.1 

9.4 

8.4 

2.8 

4.9 

6.1
130 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (cal cm~a day-')

•o 

§ Ife

m O

^

•rt >» 

SJ4 •3 To

'•&% 1 

H

o•S

1•<

Daily 

average

i£s ®

A'S 

•<

tsR* £ts

Daily radiation 

(cal cm-a dayi)

•o 

§

13

to 2

a

<O >i

"** *p

•£"3 * 

fi

1

•a

1<

Daily 

average

i?Gki-s

ja"8 '<ill

ROOSEVELT RESERVOIR, ARIZONA— Continued

1959

1— ——

2. _ ...

3—— _„

4———

5... _ .

6———

8— ——

9————

10———

11. __ .

12——— 

13.——

14——— 

15———

16.. _ .

17———

18——

19———

20———

21——— 99

23———

25_——

26———

27———

28——— OQ

30———

31———

1... __

2 ___

3— _ -

4————

5 ___ .

6... __

7—— —

8— ——

ft ____

10———

11———

12 ......

13———

14...... 

15.... ._

16———

17——— 

18——. 

19...... 

20——— 

21——— 

22...... 

23——— 

24...... 

25.... ._ 

26——— 

27——— 

28——— 

29—— ._ 

30——— 

31———

January

326 

320 

268 

280 

323 

66 

305 

277 

277 

338 

330 

330 

309 

323 

336 

301 

286 

292 

255 

341 

327 

281 

358 

331 

333 

325 

351 

345 

291 

352 

367

320 

321 

323 

324 

326 

327 

329 

330 

332 

333 

335 

337 

339 

341 

343 

345 

347 

350 

353 

356 

358 

361 

364 

367 

370 

373 

376 

379 

382 

386 

389

402 

463 

503 

465 

441 

502 

524 

452 

462 

468 

447 

442 

504 

453 

427 

451 

489 

491 

539 

478 

437 

493 

487 

482 

495 

499 

481 

463 

477 

470 

456

4.1

5.3 

7.6 

3.5 

5.4 

3.9 

6.5 

5.6 

5.4 

7.1 

7.8 

7.7 

7.9 

8.5 

7.7 

7.8 

9.3 g.8

12.8 

10.6 

6.1 

7.0 

9.2 

10.3 

11.2 

11.3 

11.1 

10.4 

9.3 

9.4 

8.9

3.9 

4.1 

5.4 

4.3 

5.3 

7.0 

7.5 

6.0 

5.4 

4.1 

5.5 

5.5 

5.7 

5.8 

4.8 

4.3 

6.2 

6.2 

7.1 

5.0 

4.1 

4.5 

5.3 

6.3 

6.6 

6.1 

5.8 

5.4 

4.8 

4.8 

4.5

March

445 

463 

484 

503 

519 

511 

517 

518 

515 

521 

542 

540 

530 

517 

536 

573 

566 

572 

576 

606 

522 

579 

580 

415 

606 

607 

417 

599 

607 

426 

582

508 

512 

517 

521 

526 

530 

534 

539 

543 

547 

552 

556 

561 

565 

570 

575 

579 

584 

589 

593 

598 

603 

607 

611 

615 

619 

624 

628 

632 

636 

640

518 

539 

568 

474 

440 

468 

480 

519 

520 

517 

705 

503 

578 

632 

475 

517 

558 

560 

536 

511 

537 

582 

567 

561 

542 

554 

557 

573 

584 

562 

617

13.9

15.2 

16.6 

12.8 

10.2 

10.4 

12.2 

14.4 

14.8 

16.3 

14.5 

13.9 

14.8 

17.6 

13.9 

14.4 

14.7 

16.1 

16.1 

15.1 

15.2 

17.1 

17.7 

14.9 

13.3 

15.3 

14.7 

16.5 

17.2 

17.9 

19.7

6.9 

7.4 

7.6 

5.6 

5.9 

6.6 

7.4 

8.4 

8.8 

9.5 

5.6 

5.6 

6.1 

7.0 

5.5 

4.5 

5.1 

5.4 

5.0 

4 0 

3.6 

5.0 

5.3 

5.7 

6.1 

5.7 

5.2 

5.6 

6.4 

6.4 

6.2

February

277 

252 

373 

381 

375 

383 

294 

170 

145 

414 

368 

178 

344 

416 

370 

185 

162 

256 

440 

431 

68 

475 

454 

460 

477 

465 

475 

445

392 

396 

399 

403 

406 

410 

414 

418 

422 

426 

430 

434 

438 

442 

446 

451 

455 

459 

464 

468 

473 

477 

482 

486 

490 

495 

499 

503

482 

571 

480 

443 

491 

481 

503 

571 

475 

468 

491 

581 

558 

505 

554 

654 

680 

617 

539 

538 

571 

473 

500 

506 

490 

523 

530 

518

7.6 

8.2 

7.8 

7.6 

8.3 

10.7 

10.7 

10.6 

5.5 

5.6 

9.0 

9.4 

9.9 

9.7 

11.5 

13.3 

13.6 

14.2 

11.7 

12.8 

9.9 

8.6 

10.0 

17.4 

11.6 

12.8 

14.3 

13.9

4.7 

5.9 

5.4 

5.2 

5.5 

6.4 

6.5 

8.0 

6.8 

6.5 

6.8 

8.8 

8.7 

7.7 

7.6 

9.6 

11.7 

10.5 

8.2 

7.6 

8.8 

6.2 

6.4 

6 0 

6.1 

6.3 

6.7 

6.9

April

604 

608 

465 

561 

476 

269 

530 

600 

655 

605 

687 

650 

651 

624 

530 

620 

674 

678 

662 

657 

595 

691 

555 

649 

596 

447 

701 

693 

693 

596

644 

648 

652 

656 

660 

664 

668 

672 

676 

680 

684 

688 

692 

696 

700 

704 

708 

712 

716 

719 

723 

726 

729 

733 

737 

740 

743 

746 

749 

752

623 

640 

653 

641 

652 

635 

612 

626 

599 

562 

592 

623 

619 

652 

674 

643 

609 

583 

658 

629 

591 

606 

624 

652 

690 

729 

657 

658 

684 

665

21.0 

23.2 

23.0 

23.0 

23.3 

19.6 

15.7 

16.5 

18.4 

19.3 

20.9 

20.7 

20.0 

22.4 

21.0 

21.1 

20.8 

18.8 

19.4 

20.1 

20.1 

21.6 

23.1 

24.5 

24.7 

21.8 

22.9 

24.5 

26.6 

26.1

6.8 

9.1 

8.6 

9.0 

7.0 

8.0 

9.8 

11.3 

10.7 

7.2 

5.2 

6.4 

6.0 

7.6 

9 4 

8.4 

5.5 

6.0 

7.9 

7.8 

6.2 

5.9 

6.7 

6.7 

8.0 

10.2 

9. 1 

8.0 

9.1 

13.2

Day

Daily radiation 

(cal cm-8 day1)

•o 

||§ §

•o >>

lul 

B

0

fe

a

i•<

Daily 

average

i?

s»u s

5* fas > g a

^

Daily radiation 

(cal car1 day-')

t) 

3 b CO CO i1

•rj ^i 

tD^

trt *°

to"3 m 

W

1

S 

3

Daily 

average

S.O, &C?

ii'S

&SS1 > g'rt ***

ROOSEVELT RESERVOIR, ARIZONA— Continued 

196*— Continued

1— __

2 _ 

3—.. '..

4. _ ...

5—— ...

6— ....

7.......

8— ....

9.......

10 _ ...

11... ...

12......

13.. ....

14 ......

15.... ..

16...... 

17. _ ..

18——.

19———

20-———

21-——

22———

23-——

24- ....

25— ...

26-——

27———

28——. 

29———

30———

. 31.——

1- .....

2— ....

3— ....

4—. ...

5—— ...

6— ....

7—- ...

8— _ .

Q

10——— 11——

12..... .

1Q

14———

15.——

16——

17—— 

18——

19— — 

20——— 

21—— 

22-—— 

23—— 

24—— 

25——— 

26—— 

27—— 

28—— 

29—— 

30—— 

31— —

May

595 

547 

570 

609 

730 

636 

695 

710 

428 

717 

724 

656 

649 

708 

701 

738 

698 

709 

722 

719 

659 

746 

742 

720 

761 

737 

757 

754 

761 

480 

752

755 

758 

760 

763 

765 

767 

770 

772 

774 

776 

779 

781 

783 

785 

787 

789 

791 

793 

795 

796 

798 

800 

802 

803 

804 

806 

807 

809 

810 

811 

813

679 

649 

645 

545 

595 

634 

626 

632 

624 

640 

683 

703 

707 

688 

676 

668 

652 

653 

708 

710 

712 

652 

659 

678 

606 

640 

648 

659 

640 

629 

638

25.2 

21.0 

17.9 

14.6 

18.9 

22.1 

23.2 

23.1 

21.9 

23.0 

26.6 

27.9 

28.1 

27.7 

27.2 

26.0 

25.3 

25.5 

25.0 

23.5 

22.2 

21.8 

24.8 

25.3 

21.4 

19.2 

24.0 

25.7 

25.6 

24.6 

24.7

17.4 

16.2 

13.6 

10.7 

7.7 

7.8 

12.1 

14.4 

14.7 

15.0 

13.7 

10.6 

12.8 

19.4 

3.6 

2.3 

3.0 

1.7 

8.3 

7.2 

9.4

July

617 

652 

649 

691 

685 

692 

621 

690 

524 

655 

637 

644 

643 

654 

589 

574 

511 

583 

621 

583 

573 

596 

626 

655 

669 

523 

640 

633 

497 

557

823 

823 

822 

822 

821 

821 

820 

819 

818 

817 

816 

815 

814 

813 

812 

811 

810 

809 

808 

807 

806 

804 

802 

800 

798 

796 

794 

792 

790 

789 

789

814 

856 

872 

858 

877 

631 

809 

839 

889 

873 

860 

909 

928 

867 

865 

877 

904 

914 

879 

904 

868 

776 

862 

890 

895 

881 

965 

949 

923 

902

30.1 

33.4 

32.9 

31.4 

33.8 

33.8 

33.1 

35.6 

31.8 

32.9 

32.7 

32.4 

32.0 

32.2 

30.8 

30.9 

30.2 

31.2 

32.1 

30.5 

29.6 

32.5 

32.3 

34.4 

35.0 

32.4 

31.4 

31.5 

30.4 

29.9

16.1 

14.0 

15.0 

16.0 

14.6 

13.3 

14.5 

10.7 

15.4 

15.9 

14.6 

15.6 

14.8 

16.5 

17.3 

18.9 

19.6 

18.7 

18.6 

20.0 

19.9 

21.0 

20.3 

18.6 

18.0 

19.8 

20.8 

19.8 

19.5 

20.7

June

772 

691 

737 

635 

751 

717 

709 

741 

727 

740 

722 

544 

265 

546 

673 

668 

617 

522 

518 

587 

631 

599 

603 

663 

844 

693 

703 

691 

695 

635

8J4 

816 

8?7 

8? 8 

8:9 

820 

830 

831 

832 

8TI2 

833 

833 

834 

834 

SW 

835 

835 

815 

8W 

8^6 

8% 

8% 

8% 

8% 

8% 

835 

8% 

834 

834 

834

736 

740 

708 

731 

755 

731 

731 

690 

744 

700 

773 

848 

739 

918 

872 

869 

861 

901 

936 

876 

856 

842 

876 

608 

818 

866 

798 

828 

930 

877

27.2 

27.2 

28.9 

29.4 

30.0 

29.9 

30.0 

29.4 

29.1 

29.9 

31.1 

32.6 

29.6 

32.5 

35.0 

35.0 

33.8 

32.4 

29.1 

31.7 

31.9 

32.6 

34.1 

32.9 

32.5 

31.7 

30.4 

29.9 

30.2 

30.0

7.8 

10.2 

6.9 

10.4 

11.7 

7.4 

7.9 

7.6 

7.3 

7.3 

8.6 

8.0 

13.1 

15.7 

9.2 

9.2 

10.2 

14.1 

14.6 

13.4 

12.9 

10.3 

9.5 

8.5 

6.3 

8.5 

11.6 

13.3 

14.9 

17.2

August

584 

550 

569 

472 

397 

458 

573 

593 

446 

451 

511 

388 

580 

548 

539 

647 

668 

391 

501 

608 

585 

564 

574 

570 

521 

633 

648 

637 

638 

634 

623

786 

784 

782 

780 

778 

776 

773 

770 

767 

764 

761 

758 

755 

752 

749 

746 

743 

740 

736 

733 

730 

727 

724 

720 

717 

714 

710 

707 

704 

700 

696

880 

882 

838 

853 

823 

857 

815 

880 

880 

826 

857 

856 

860 

862 

830 

871 

867 

841 

821 

857 

834 

844 

844 

828 

855 

831 

825 

826 

824 

847 

775

30.5 

30.2 

27.9 

28.5 

26.7 

26.8 

2.7.9 

29.8 

29,9 

25.0 

29.0 

26.4 

30.3 

28.7 

26.7 

31.2 

31.7 

30.0 

29.4 

31.1 

30.0 

30.0 

30.6 

31.1 

30.0 30.6' 

31.7 

32.2 

32.8 

32.8 

31.9

19.3 

19.8 

21.6 

22.4 

22.7 

21-6 

21-9 

2J.2 

18.5 

20.3 

21.7 

22.5 

21.5 

2M 

21.8 

21.3 

21.4 

22.2 

16.9 

20.9 

18.9 

21.1 

20.8 

22.0 

22.4 

21.6 

19.5 

18.2 

18.1 

21.2 

14.1
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 131

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Dally radiation 

(cal ran-2 day-1)

m 3 

gl

a

>B ^> 1?

«,o» I

Daily 

average

|| 

|!

SfooS' H

> g d 

j&fl

Daily radiation (cal cm~2 day-i)

|1

•«.& 

1£& *S^S o

M 0 M 

W

Ift 

8

3

Dally 

average

|?

S^ <3 H

£03 •4

H 

>§? i&s •4

ROOSEVELT RESERVOIR, ARIZONA— Continued 

1959— Continued

,. " —

^ — _- — _

'0

•1

' Q

•4———. •5

•6——— '7

•8——— 

•o

•"!

r Q

5,5

5.7 5.8

5.9—— ;'a

n. _ .

;N

-

•N

~

'N

0— —

•1———

•a .

•4... ... 

'5— —

•6— — 

•7— — 

•8— — 

•9—— -

;;o—— -

"T — — 

5.2———_ 

5.3.—— ~'f___

5.8—— 

s,9_——

fill— I

September

592 

589 

586 

596 

592 

582 

594 

594 

581 

255 

250 

431 

535 

553 

403 

540 

559 

557 

566 

554 

557 

574 

481 

466 

550 

534 

535 

530 

521 

311

693 

689 

686 

682 

678 

674 

670 

666 

662 

657 

653 

648 

644 

639 

635 

631 

626 

622 

617 

613 

608 

604 

600 

595 

591 

586 

582 

578 

573 

569

793 

773 

764 

715 

721 

739 

706 

712 

755 

794 

798 

800 

702 

742 

742 

668 

679 

685 

670 

682 

796 

653 

644 

698 

605 

619 

623 

632 

652 

658

32.2 

31.6 

30.8 

29.9 

29.8 

30.7 

30.2 

29.6 

31.2 

29.2 

28.1 

29.2 

29.0 

27.9 

'25.3 

24.6 

23.4 

24.2 

24.7 

25.2 

15.3 

25.2 

24.6 

23.3 

22.5 

22.6 

23.6 

23.7 

23.5 

19.2

13.9 

13.3 

13.2 

11.5 

11.3 

10.8 

9.5 

11.0 

11.8 

11.9 

14.6 

12.4 

6.7 

10.8 

17.3 

13.3 

14.0 

9.9 

9.1 

10.1 

18.4 

9.2 

9.0 

13.6 

7.9 

7.5 

8.7 

9.4 

10.3 

12.5

November

398 

331 

212 

390 

420 

413 

395 

392 

355 

376 

253 

302 

178 

259 

124 

274 

311 

258 

278 

350 

343 

347 

338 

338 

347 

342 

336 

332 

314 

310

432 

428 

424 

420 

416 

412 

408 

405 

401 

397 

394 

390 

387 

384 

381 

378 

375 

372 

369 

366 

364 

361 

358 

355 

352 

350 

348 

346 

344 

342

623

499 

590 

554 

480 

473 

493 

522 

545 

542 

558 

626 

614 

588 

538 

584 

566 

571 

595 

526 

514 

500 

511 

540 

528 

504 

424 

446 

462 

480

14.7 

13.1 

11.4 

11.9 

12.0 

11.6 

10.9 

12.9 

13.7 

13.5 

12.7 

14.9 

13.7 

12.8 

11.5 

13.8 

13.2 

11.6 

12.8 

13.6 

12.1 

12.1 

11.0 

13.8 

12.6 

11.7 

8.2 

6.9 

8.6 

8.6

11.3 

10.9 

10-0

9.5 

3.9 

4.1 

6.5 

7.3 

7.7 

8.6 

9.2 

9.5 

10.5 

10.4 

11.6 

11.7 

9.9 

8.9 

9.1 

7.5 

6.7 

5.7 

6.0 

7.7 

8.1 

5.7 

3.2 

4.8 

5.3 

5.9

October

329 

133

548 

533 

524 

325 

504 

487 

428 

481 

473 

434 

480 

451 

380 

430 

454 

456 

456 

445 

438 

438 

450 

418 

422 

408 

361 

374 

67 

84 

349

565 

560 

556 

551 

547 

542 

538 

534 

52» 

525 

521 

516 

512 

507 

503 

499 

494 

490 

485 

481 

476 

472 

468 

464 

460 

456 

452 

448 

444 

440 

436

646 

607 

601 

576 

604 

607 

599 

608 

614 

628 

664 

659 

628 

611 

617 

651 

641 

628 

598 

608 

622 

626 

644 

660 

630 

647 

658 

647 

562 

517 

545

14.5 

13.0 

16.2 

18.2 

19.4 

19.5 

19.7 

20.5 

20.3 

21.7 

23.7 

24.2 

23.0 

23.4 

22.0 

22.0 

22.8 

21.5 

20.4 

20.5 

20.9 

22.0 

23.8 

24.8 

23.2 

22.9 

22.2 

21.3 

12.9 

6.4 

9.1

11.6 

11.9 

9.6 

8.3 

9.1 

9.2 

8.4 

8.9 

9.0 

9.5 

10.3 

10.1 

7.2 

7.0 

8.0 

8.0 

8.3 

8.7 

7.2 

7.7 

8.5 

8.5 

7.8 

8.7 

8.7 

9.2 

7.7 

8.8 

12.3 

8.0 

7.9

December

317 

301 

306 

310 

331 

316 

241 

274 

197

222 

305

260 

344 

311 

288 

267 

209 

125 

254 

155

291 

313

247 

275 

104 

70

340 

338 

336 

334 

332 

330 

328 

326 

324 

323 

322 

321 

320 

319 

318 

317 

317 

316 

316 

315 

315 

315 

315 

315 

316 

316 

317 

317 

318 

319 

320

482 

528 

511 

496 

429 

481 

499 

617 

599 

499 

547 

490 

650 

506 

578 

472 

524 

542 

574 

608 

682 

630 

635 

594 

411 

446 

466 

485 

472 

552 

687

9.6 

9.5 

12.5 

10.5 

10.5 

8.0 

8.2 

10.8 

11.2 

10.0 

9.2 

7.5 

8.2 

2.2 

4.8 

6.5 

7.2 

10.0 

8.8 

10.2 

11.2 

11.2 

10.5 

9.5 

7.2 

5.5 

5.0 

5.2 

6.0 

4.7 

6.0

5.8 

3.9 

5.2 

6.0 

2.2 

4.6 

5.4 

5.8 

11.6 

11.6 

9.4 

8.0 

8.0 

6.6 

6.9 

7.3 

7.4 

7.6 

7.9 

7.7 

9.9 

9.9 

9.5 

11.0 

12.0 

5.6 

5.6 

5.8 

5.8 

6.6 

7.0

Day

Daily radiation 

(cal ran-* day-i)

•8

3 ia to 03 

v O

a

10 &

!**

^-SS 

w

o

!"6

I

•4

Dally 

average

&o

Q&s

.tJ*

•4

111 iftS •4

Dally radiation 

(cal cm-* day-i)

•o 

<gJ3 

%*

t3 ^* 

SJd ts| a

'•§•§1 

w

1 

|

3

Daily 

avenee

fc£

H s •4

t-( •

A Si •4

ROOSEVELT RESERVOIR, ARIZONA— Continued 

1960

1 .......

2 __ ...

3.

4_ __ .

5 .......

6 .......

7.- .....

8 ___ .

9 ___ .

10 ......

11 ......

12—— 

13———

14— ...

15... ...

16... ... 

17..—.

18 ......

19— ...

20- ....

21. .....

22— ...

23———

24—... 

25......

26———

27 ___ .

28 ___ . 

29 ___ .

30- __ -

31... ...

January

108 

323 

320 

252 

296 

313 

307 

305 

283 

82 

43 

194 

100 

289 

218 

95 

323 

349 

347 

359 

332 

322 

333 

357 

298 

260 

202 

363 

335 

298 

373

320 

321 

323 

324 

326 

327 

329 

330 

332 

333 

335 

337 

339 

341 

343 

345 

347 

350 

353 

356 

358 

361 

364 

367 

370 

373 

376 

379 

382 

386 

389

548 

402 

401 

419 

413 

426 

470 

474 

523 

562 

468 

532 

424 

497 

580 

417 

465 

415 

441 

437 

417 

455 

518 

544 

546 

552 

514 

512 

474 

531 

518

0.5 

-1.7 

-1.2 -.6 

-1.2 -.6 

1.6 

5.0 

6.6 

5.0 

6.1 

5.5 

1.6 

1.1 

1.1 

1.6 

-1.7 

.6 

2.7 

3.3 

4.4 

5.0 

6.1 

7.7 

8.2 

9.8 

7.2 

8.7 

12.2 

10.0 

7.8

6.7 

5.8 

5.2 

5.2 

4.8 

5.2 

6.2 

7.4 

7.7 

9.1 

12.6 

10.8 

9.1 

7.3 

7.2 

7.7 

4.6 

4.8 

5.2 

5.6 

6.0 

6.8 

7.7 

8.8 

7.7 

8.5 

8.3 

7.2 

7.0 

11.4 

10.6

February

336

284 

402 

402 

378 

403 

387 

387 

296 

142

392 

396 

399 

403 

406 

410 

414 

418 

422 

426

527 

447 

459 

497 

454 

494 

500 

513 

544 

438

8.7 

9.7 

8.6 

8.6 

7.2 

8.8 

10.1 

10.3 

11.2 

6.6

6.8 

7.6 

5.4 

6.6 

6.1 

7.0 

7.4 

8.5 

8.9 

7.7

'

LAKE MOHAVE ARIZONA-NEVADA

1959

1.. __

0

4 __ -

6- .....

7- .....

g

10 ...... 11

12— — 

13———

14- _ -

15- ....

16 _ ...

17— -

18- ....

19— _ 

20 ......

21. ..... 

22— _ 

23_ ..... 

24. .....

25- ....

26——— 27——" 

28———

29- ....

30—— Ql

September

256 

538 

481 

302 

388 

599 

600 

440 

517 

494 

481 

564

545

421 

536 

497 

544 

535 

507 

498 

512 

521 

490

688 

684 

680 

677 

673 

669 

665 

661 

657 

653 

649 

645

632

614 

609 

605 

600 

595 

591 

586 

582 

577 

573

761 

773

768 

735 

741 

792 

821 

864 

795 

801 

792 

701 

701 

739 

687 

715 

761 

733 

717 

712 

696 

682 

745 

766 

719 

658 

727

26.1 

31.2 

30.6 

32.4 

31.1 

32.8 

34.8 

33.3 

34.0 

34.8 

35.8 

36.5 

36.2 

35.5 

33.0 

31.6 

31.0 

31.0 

31.8 

30.5 

30.3 

27.7 

27.7 

29.1 

31.2 

30.9 

31.4 

30.8 

29.4 

27.4

17.6 

23.3 

25.1 

25.0 

23.2 

22.8 

24.0 

22.3 

20.5 

21.8 

19.2 

17.4 

15.7 

15.0 

14.3 

14.6 

13.1 

15.2 

12.8 

12.5 

11.2 

7.5 

7.1 

8.7 

8.1 

9.2 

9.7 

8.0 

9.6 

9.8

October

490

485 

482 

479 

460 

457 

466 

410 

176 

421 

483 

464 

439

349 

416 

432 

443 

440 

439

412 

401 

398 

388 

387 

405 

410 

400

561 

557 

552 

548 

544 

540 

535 

531 

526 

521 

516 

512 

507

489 

484 

479 

474 

469 

464

456 

451 

446 

442 

438 

434 

430 

426

726 

716 

771 

792 

807 

815 

774 

708 

729 

684 

661 

668 

709

723 

735 

688 

667 

662 

670

706 

677 

684 

645 

628 

618 

582 

594

26.5 

26.9 

27.3 

28.4 

29.5 

29.5 

30.5 

27.2 

20.7 

19.0 

19.9 

22.0 

21.4 

21.0

22.2 

21.8 

22.5 

22.6 

23.2 

22.7

25.5 

23.9 

23.7 

23.4 

22.5 

22.2 

21.3 

21.9

8.4 

9.8 

14.0 

15.3 

13.3 

12.0 

13.7 

9.8 

10.2 

9.3 

10.4 

10.1 

8.5 

8.9

10.9 

12.3 

11.7 

9.8 

10.3 

10.9

10.6 

11.6 

10.1 

10.3 

9.4 

7.5 

5.9 

5.3
132 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation 

(cal cmr2 day-1 )

•d

3 b CO 03 Is

•dfr

•M oMCO

S ra ra !•§*§

w

1

-a

I ^

Daily 

average

®?

||

£ 08 <!

&§ gSS" Q. E3

|U

Daily radiation (cal cm-2 day-1)

•d 

<c

S'Sco 03 § w

•d >>

I!*

248 "3

CO CJ CO w

1

3

Daily 

average

£o

3 ®

5J H

* a •<

i- ®

|s~?81 .Sa Oi-5- 

•<

LAKE MOHAVE ARIZONA-NEVADA— Continued

1959— Continued

1————

4————

7————

9

10———

11———

12

13——— 

14———

15———

16 .... 

17——— 

18———

20———

21..——

£t£ — ____ 

00

24..—— OK

26

27. — ..

no

29

30———

31——.

1— — .

2—.... 

3_——— 

4__ - 

5-....

6.. ..

7— .... 

8— .... 

9— .... 

10— — 

11 ——— 

12—— _ 

13———

14——— 

15...... 

16..-.. 

17-.— 

18——— 

19——— 

20——— 

21——— 

22 —— . 

23——— 

24—... 

25...— 

26——— 

27———

28...... 

29—...

SO——— 

31———

November

404 

325 

233 

203 

59 

320 

362 

360 

359 

345 

358 

338 

288 

340 

331 

361 

341 

343 

314 

330 

340 

333 

327 

317 

317 

241 

318 

314 

241 

265

422 

418 

413 

409 

405 

401 

397 

393 

390 

387 

384 

380 

377 

373 

370 

367 

363 

360 

357 

354 

351 

348 

345 

342 

340 

338 

336 

334 

332 

330

642 

666 

792 

743 

719 

680 

665 

612 

607 

586 

612 

597 

596 

565 

558 

542 

553 

607 

619 

574 

574 

543 

571 

593 

602 

625 

565 

514 

564 

578

21.5 

20.9 

22.5 

22.1 

17.3 

19.2 

16.8 

17.0 

17.2 

18.4 

18.1 

16.3 

16.3 

14.8 

14.5 

18.0 

18.3 

17.5 

18.2 

16.4 

16.5 

17.6 

12.6 

15.3 

15.3 

16.0 

14.0 

13.6 

14.0 

16.2

6.7 

7.9 

7.6 

13.2 

15.6 

14.7 

12.1 

12.2 

10.1 

8.3 

10.1 

10.2 

10.2 

8.7 

6.1 

5.0 

7.0 

8.0 

6.7 

6.5 

8.1 

7.1 

8.3 

7.9 

7.5 

7.9 

5.7 

6.0 

4.9 

7.0

1960 

January

319 

312 

320

268 

318

320

318 

319 

328 

322 

319 

323 

319 

320 

328 

324 

320 

335 

232 

353 

326 

325 

324 

310 

86 

237 

370 

344 

369 

366

310 

311 

312 

313 

314 

316 

317 

319 

321 

323 

325 

327 

329 

331 

333 

335 

337 

339 

342 

345 

348 

350 

353 

356 

359 

362 

365 

368 

371 

375 

379

567 

539 

560 

590 

593

591

646 

635 

660 

698 

708 

589 

619 

629 

615 

591 

583 

602 

612 

598 

626 

631 

678 

695 

669 

707 

642 

618 

647 

708

12.6 

12.2 

13.3 

12.6 

14.6 

16.0 

16.2 

13.5 

15.5 

17.5 

18.8 

18.9 

14.4 

15.9 

17.5 

18.5 

-17.2 

16.4 

16.2 

16.6 

15.2 

12.2 

15.8 

16.4 

15.3 

13.6 

13.8 

11.2 

10.6 

14.3 

14.2

6.7 

5.7 

6.5 

5.7 

5.5 

5.2 

5.9 

6.1 

6.6 

6.6 

8.2 

8.3 

9.9 

11.3 

12.3 

13.6 

12.6 

9.0 

5.6 

5.3 

5.5 

5.4 

5.2 

5.1 

8.8 

11.5 

10.0 

5.6 

6.4 

7.1 

8.4

December

290 

241 

311 

262 

316

265 

232 

285 

282 

254 

289 

289 

283 

295 

287 

290 

298 

294 

228 

286 

307 

292 

289 

290 

301 

296 

298 

320 

322

326 

324 

322 

320 

318

315 

314 

313 

312 

311 

310 

309 

308 

307 

307 

307 

306 

306 

306 

306 

306 

306 

306 

306 

307 

307 

307 

308 

309

572 

567 

524 

508 

433

569 

594 

533 

541 

576 

549 

575 

528 

515 

471 

534 

529 

539 

531 

536 

533 

561 

583 

626 

570 

567 

570 

577 

576

14.1 

13.8 

11.8 

10.6 

8.5

8.2 

9.6 

8.6 

11.9 

14.2 

14.6 

12.0 

11.0 

13.3 

13.4 

14.5 

15.4 

15.5 

14.3 

17.2 

18.2 

16.3 

15.8 

16.0 

14.5 

14.5 

14.6 

15.0 

14.1

7.7 

7.6 

5.7 

3.9 

3.8

6.2 

7.3 

6.3 

7.5 

6.2 

6.6 

7.4 

8.2 

7.3 

6.0 

7.3 

6.9 

4.7 

4.3 

5.6 

6.7 

8.5 

8.0 

8.4 

7.4 

6.9 

6.6 

6.4 

6.3

February

351 

298 

391 

407 

413 

397 

300 

401 

433 

418 

400 

407 

323 

435 

418 

226 

454 

388 

450 

444 

441 

416 

489 

487 

433 

444 

493 

493

382 

386 

389 

393 

397 

401 

405 

409 

413 

417 

421 

425 

429 

433 

437 

442 

446 

451 

455 

459 

463 

468 

472 

476 

480 

485 

489 

493

667 

682 

644 

636 

607 

678 

737 

672 

697 

718 

729 

739 

665 

622 

690 

715 

679 

721 

727 

673 

553 

570 

553 

570 

603 

649 

557 

610

16.3 

16.7 

15.3 

16.0 

15.2 

13.6 

15.5 

14.4 

16.5 

17.8 

18.7 

18.9 

15.2 

17.4 

17.2 

17.2 

16.4 

15.4 

16.2 

18.2 

20.0 

17.5 

14.1 

13.3 

14.8 

15.9 

13.1 

15.1

8.0 

7.0 

7.9 

6.2 

5.3 

5.7 

6.5 

6.8 

7.8 

9.2 

8.3 

8.8 

6.3 

5.8 

6.8 

7.2 

7.2 

6.1 

7.4 

7.2 

7.6 

6.2 

4.1 

3.8 

3.1 

4.2 

3.1 

4.1

Day

Daily radiation 

(cal cm-2 day1)

•d

loi I1

»rt ^»

© .M i£s In

w

I

1<

Daily 

average

£08,°,

g «

Is.a* •<

h <U 

> JO'S iS3 •<

Daily radiation (cal cm-2 day-1)

•d

» 

eg 03

i1

t3 ^» 

•4§l$

1-2 'o 1o o »

W

j

^

Daily 

average

&0

!' &EO--V OS 03.0 III

LAKE MOHAVE ARIZONA-NEVADA— Continued 

1960— Continued

1.——.

2. ......

3—— ..

4......

5——— _

6.......

7.......

8- ....

9.......

10......

11— —

12——— 

13 ———

14...... 

15. ....

16......

17......

1 Q

19-....

20......

21——— 

22———

23——

24———

25———

26———

27———

28———

29———

30-.... 

31———

1———— 

2———— 

3——.. 

4———

5.. __ .

7—— —

8 

9-... _ 

10- _ . 

11—— 

12——— 

13———

14——— 

15——— 

16——— 

17——— 

18——— 

19——— 

20——— 

21—— 

22——— 

23——— 

24——— 

25——— 

26——— 

27.——— 

28——— 

29.. __ 

30——— 

31— —

March

502 

452 

391 

235 

493 

504 

525 

521 

530 

535 

529 

501 

548 

550 

431 

576 

451 

380 

521 

553 

582 

575 

528 

569 

555 

589 

583 

388 

434 

622 

595

680 

688 

589 

643

723 

727 

731 

686 

609 

748 

509 

748 

754 

732 

718 

727 

739 

754 

751 

749 

751 

749 

756 

756 

742 

761 

580 

576 

761 

734

498 

502 

507 

511 

516 

521 

525 

530 

535 

540 

545 

549 

554 

559 

564 

569 

573 

577 

582 

587 

591 

595 

600 

604 

609 

613 

618 

622 

627 

632 

636

753

756 

759 

762

770 

773 

775 

777 

779 

781 

784 

786 

788 

790 

792 

793 

794 

796 

798 

800 

801 

803 

804 

806 

808 

810 

811 

812 

813

629 

650 

687 

633 

655 

677 

612 

599 

648 

651 

671 

697 

699 

703 

655 

706 

665 

658 

740 

683 

758 

747 

706 

653 

682 

645 

704 

763 

729 

691 

705

May

743 

769 

712 

691

757 

757 

769 

747 

684 

671 

705 

686 

700 

771 

730 

728 

687 

780 

780 

768 

750 

757 

751 

732 

721 

727 

686 

716 

704

17.0 

17.4 

16.4 

12.6 

13.3 

16.5 

15.3 

16.6 

18.6 

18.7 

18.8 

19.4 

20.1 

21.3 

19.2 

16.9 

16.2 

15.9 

18.8 

19.6 

22.1 

22.7 

23.1 

19.6 

16.5 

15.4 

19.3 

15.2 

16.1 

17.2 

20.2

28.9 

28.6 

25.9 

22.4

&L, tt

21.9 

24.2 

28.1 

29.1 

26.2 

19.2 

21.8 

24.8 

26.7 

28.1 

27.7 

28.3 

27.2 

25.7 

28.8 

29.4 

28.8 

29.1 

29.1 

29.4 

28.2 

27.0 

25.5 

25.4 

25.4

4.5 

4.9 

7.9 

7.8 

8.3 

6.2 

4.4 

4.1 

4.7 

4.4 

4.4 

6.0 

4.0 

4.2 

6.4 

6.8 

5.5 

6.4 

8.2 

6.2 

Ilr3 

6.7 

5.9 

6.5 

5.8 

5.0 

7.4 

7.5 

7.0 

6.7 

5.9

5.1 

6.2 

7.0 

7.8

5.5 

6.7 

7.6 

6.4 

4.8 

4.9 

5.5 

5.9 

4.9 

5.0 

5.7 

6.2 

5.9 

5.3 

7.9 

6.7 

6.5 

6.7 

5.9 

5.9 

5.9 

6.4 

6.9 

7.4 

6.7 

7.0

AprH

627 

610 

623 

653 

515 

632 

233 

671 

629 

638 

668 

673 

683 

705 

655 

662 

665

707 

700

690 

716 

710 

693 

715 

725 

715 

717 

680

783 

749 

766 

745 

727 

748 

730 

757 

748 

759 

755 

748 

761 

776 

769 

732 

727 

723 

727 

728 

703 

701 

436 

628 

712 

731 

735 

747 

671

6<U) 

6*5 

6*9

ess

658 

662 

666 670 

674 6^8 

682 

686 

690 

694 

698 

702 

706

7:- 4 7'7

724 

728 

732 

735 

738 

741 

744 

747 

7,50

8'4 

8'6 

8'7 

8'8 

8'9 

8?0 

8^1 

822 

822 

873 

823 

874 

874 

825 

875 

826 

826 

877 

897 

828 

828 

829 

8?8 

8"?8 

877 

817 

876 

8^6 

895

713 

773 

782 

800 

728 

712 

710 

689 

716 

735 

707 

701 

707 

701 

723 

717 

755

726 

666

675 

629 

653 

678 

691 

706 

710 

725 

774

June

683 

764 

793 

800 

802 

776 

769 

753 

770 

790 

780 

818 

864 

836 

840 

861 

897 

896 

894 

885 

833 

930 

913 

903 

814 

765

22.3 

25.8 

27.4 

28.9 

23.7 

23.4 

18.1 

17.9 

20.6 

21.8 

20.6 

23.1 

20.6 

21.4 

23.4 

25.0 

27.1

25.0 

20.6

20.6 

18.5 

17.9 

18.6 

20.8 

23.3 

25.0 

27.0 

29.9

23.1 

25.1 

28.6 

29.9 

30.8 

31.5 

31.1 

31.4 

31.2 

31.8 

32.1 

33.4 

34.6 

36.6 

37.1 

37.8 

37.4 

37.6 

39.1 

39.5 

38.2 

40.8 

40.2 

39.2 

38.1 

36.1

7.1 

7.7 

8.3 

5.5 

5.2 

9.4 

10.9 

7.2 

5.0 

7.8 

6.0 

5.1

£.9 

6.3 

6.3

11.1 

8.2

6.2 

4.5 

4.5 

4.4 

4.8 

4.3 

5.8 

3.9 

3.8

6.3 

7.3 

7.2 

7.3

8.0 

6.6 

6.9 

7.3

7.5 

7.5 

7.7 

7.6 

7.4 

6.8

7.1

11.1 

12.3

9.6 

9.3 

10.6 

8.2 

9.2 

9.1 

7.6 

7.0
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 133

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature- and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation 

(cal cmr2 day-1)

-a

1*VI C3 I1

t3 P*» 

vM «"„

18.3 •63*38 

W

o 

1

H

^

Daily 

average

go

t^g

£3

.ha •4

li

'•<III

Daily radiation 

(cal cm~2 day-i)

8-1 1°

T) g> 

•S'ra

«•§! m o m

w

'£»

*a

1 <

Daily 

average

FgO

p,^x

Si

.*«! •4

|i 

111 •4

LAKE MOHAVK ARIZONA-NEVADA— Continued

1960— Continued

1.. __

2————

3——.

5_———

6— __

7— —-

8- __ -

9—— —

10———

11——

12—— 10

14———.

15

16———

17——

18 ___ .

19.———

20———-

91

99

23_——_

94

25

26

97

28-_.__.

29

on

31——-

1 __ -

2— ——

3————

4. _

5.— ..

6__ ——

7————

8————

9————

10———_

11———

12- . ..

13———

14.— __

15. . .

16———

17———.

18——— 

19— — 

20——— 

21———

22——— 

23 _ — 

24——— 

25———. 

26——— 

27 _ — 

28——— 

29.. _ _ 

30- _ _ 

31- _ .

July

488 

750 

293 

742 

757 

751 

728 

725 

705 

712 

709 

686 

555 

698 

718 

674 

682 

701 

701 

694 

689 

701 

658 

613 

671 

664 

668 

637 

544 

668 

675

824 

824 

823 

822 

822 

821 

820 

819 

818 

817 

816 

815 

814 

812 

811 

810 

809 

807 

806 

805 

804 

802 

800 

798 

796 

794 

792 

790 

788 

786 

784

821 

855 

867 

829 

718 

735 

819 

873 

893 

853 

883 

884 

864 

841 

837 

865 

880

793

927 

918 

912 

940

868 

851

878

32.6 

34.0 

28.6 

31.2 

31.8 

32.6 

34.9 

38.2 

39.1 

38.7 

39.8 

38.3 

37.4 

37.4 

37.7 

39.2 

37.5

36.9 

38.1 

38.9 

39.2 

33.4 

34.4 

35.9

10.9 

18.6 

14.5

9.0 

11.1 

13.7

15.9 

17.2 

16.7 

14.3 

18.8 

18.8 

17.2

September

596 

602 

647 

623 

614 

611 

602

577 

590 

573 

380 

555 

530 

553 

430 

578 

564 

559

422 

532 

529 

532 

536 

442 

514 

530 

518

688 

684 

680 

677 

673 

669 

665

653 

649 

645 

641 

636 

632 

628 

623 

619 

614 

609

600 

595 

591 

586 

582 

577 

573 

569 

565

798 

784 

676 

713 

736 

750 

686

715 

750 

806

843 

834 

715 

735

724

668

728 

754 

681

32.2 

30.7 

27.2 

28.7 

29.5 

30.5 

30.4

28.4 

29.7 

31.9 

28.6

30.7 

30.1 

26.9 

26.9

244

27.3

29.9 

30.6 

28.9

12.6 

8.5

10.7 

11.6 

15.1

16.6 

19.7 

12.2 

12.0

14.1

8.8

9.6 

11.8 

10.1

August

669 

502 

511 

583 

610 

658 

593 

598 

538 

586 

592 

622 

605 

650 

544 

630 

630 

428 

618 

579 

607 

584 

425 

533 

610 

620 

539 

623 

578 

614 

573

782 

780 

778 

776 

774 

772 

770 

768 

765 

762 

759 

756 

753 

750 

747 

744 

741 

738 

735 

732 

728 

725 

721 

718 

714 

711 

707 

703 

700 

696 

692

916 

844 

911

949 

918 

891 

887 

875 

888 

903 

853 

861 

871 

904 

895 

954 

977 

958 

956 

888 

913 

844 

767 

882 

812 

817 

853 

844

37.8 

36.5 

36.1 

33.0 

34.9 

38.9 

39.6 

39.8 

37.6 

35.9 

34.7 

36.4 

36.3 

36.8 

31.2 

33.6 

37.0 

32.5 

35.4 

37.8 

38.3 

37.2 

28.9 

32.8

34.9 

35.4 

35.7 

34.2 

32.6 

30.2 

31.5

14.2 

13.6 

15.3 

20.5 

19.4 

12.4 

11.5 

13.0 

15.4 

17.4 

16.9 

14.6 

11.5 

10.9 

18.9 

17.7 

14.0 

13.2 

20.7 

18.3 

17.8 

18.4 

22.6

16.5 

10.5 

10.4 

12.4 

17.9 

10.4 

15.5

October

500 

514 

448

481 

476 

467 

196 

397 

476 

476 

454 

459 

445 

440 

445 

374 

421 

415 

416 

169 

440 

737 

427

391 

407 

244

561 

557 

552

544 

540 

535 

531 

526 

521 

516 

512 

507 

502 

498 

493 

489 

484 

479 

474 

469 

464 

460 

456

434 

430 

426

687 

650 

653

715 

702 

669 

614 

611 

615 

636 

646

699 

691 

686 

736 

610 

565 

589

529 

558 

596

27.6

27.7 

27.7

26.9 

28.1 

27.7 

17.1 

16.8 

18.6 

20.9 

23.5

25.8 

25.8 

25.6 

24.1 

21.9 

20.5 

19.6

14.1 

14.6 

11.8

10.7 

8.3 

8.4

11.0

8.8

8.3

7.9 

7.8 

8.6 

7.6 

6.1 

5.6 

6.3

4.5 

5.7 

9.9

Day

Daily radiation 

(cal cm-2 day-1)

•g 

§.§ Is

It 

11^

•ra*3 M

W

o '§

•a

1 %

Daily 

average

6?

S£ 

S|

.fcKS •4

|i 

£§1 .683 •4

Daily radiation 

(cal cm-2 day-i)

« 

§ 3 "a

|1

It

SHI 

w

1

-a

!

Daily 

average

i?a^ 

S «

Is3 s

L, 03

oJ

« SP > g el 6&S <)

LAKE MOHAVE ARIZONA-NEVADA— Continued

1960— Continued

1.... _

2—— ...

3———

4- ....

5... _ .

6.

7.———

8.———

9.......

10—— 

11———

12..— .

13——..

14——.

If———

16..— .

17——.

18——.

19——

20———

21 ———

22———

23———

24———

25———

26———

27———

28———

29——— 

30———

31———

November

403 

400 

395 

392 

364 

364 

364 

133 

364 

364 

343 

373 

362 

370 

355 

248 

351 

277 

345 

208 

271 

337 

335 

178 

73 

322 

307 

325 

97 

242

422 

418 

413 

409 

405 

401 

397 

393 

390 

387 

384 

380 

377 

373 

370 

367 

363 

360 

357 

354 

351 

348 

345 

342 

340 

338 

336 

334 

332 

330

'610 

581 

603 

587 

563 

570 

605 

683 

704 

640 

638 

523 

£08 

519 

566 

655 

521 

519 

557 

610 

560 

529 

541 

609 

678 

625 

572 

558 

615 

611

13.8 

15.2 

16.1 

19.1 

17.0 

16.8 

19.4 

18.9 

19.3 

18.9 

18.2 

16.7 

14.6 

15.1 

13.8 

15.2 

13.1 

12.0 

10.8 

12.4 

11.8 

11.9 

11.4 

10.5 

12.4 

14.8 

15.1 

16.0 

11.9 

12.6

8.1

8.4 

7.8 

6.7 

4.2 

4.2 

4.9 

8.0 

10.8 

9.4 

8.2 

4.4 

3.7 

3.8 

4.4 

5.6 

4.8 

3.7 

5.3 

5.7 

6.9 

5.0 

6.1 

6.2 

9.2 

9.0 

8.3 

8.2 

8.0 

7.9

December

272 

107 

313 

316 

313 

289 

320 

311 

274 

65 

313 

285 

304 

78 

118 

295 

216 

112 

282 

287 

288 

296 

298 

302 

302 

289 

295 

282 

290 

299 

239

328 

326 

324 

322 

320 

318 

316 

315 

314 

313 

312 

311 

310 

309 

308 

307 

307 

307 

306 

306 

306 

306 

306 

306 

306 

306 

307 

307 

307 

308 

309

621

659 

560 

535 

524 

524 

483 

526 

546 

587 

442 

483 

479 

551 

524 

541 

637 

691 

564 

543 

539 

521 

511 

513 

535 

526 

523 

514 

524 

553 

591

13.4 

14.6 

12.3 

14.6 

15.0 

14.9 

12.0 

9.3 

8.8 

7.6 

6.2 

5.9 

7.2 

7.1 

7.1 

8.9 

8.0 

10.5 

11.1 

13.0 

12.2 

14.9 

15.4 

16.1 

12.0 

12.9 

13.2 

13.9 

14.0 

13.6 

16.1

8.0 

11.2 

8.9 

7.2 

6.0 

6.1 

4.5 

4.7 

4.2 

4.8 

3.5 

3.2 

3.7 

5.7 

7.9 

7.6 

7.0 

9.0 

8.7 

8.7 

8.3 

6.4 

4.9 

' 4.8 

6.2 

6.2 

6.0 

5.2 

5.6 

5.7 

5.1

1%1

2

7..—— -

1011

19

14——— 

15

17— — 

18——— 

19——— 

20——— 

21——— 

22... _

93

24———

25 .... 

26—— 

27——— 

28——— 

29——— 

30——— 

31 ———

January

106 

305 

301 

308 

311 

287 

296 

311 

310 

330 

342 

330 

174 

342 

303 

332 

261 

293 

275 

160 

173 

261 

547 

302 

333 

363 

340 

375 

368 

380 

379

310 

311 

312 

313 

314 

316 

317 

319 

321 

323 

325 

327 

329 

331 

333 

335 

337 

339 

342 

345 

348 

3SO 

353 

356 

359 

362 

365 

368 

371 

375 

379

657 

538 

533 

528 

520 

593 

632 

597 

580 

440 

406 

462 

582 

440 

453

552 

585 

697 

535 

503 

490 

574 

575 

535 

538 

535 

540 

539 

556

15.2 

15.4 

14.4 

14.7 

14.8 

15.0 

18.8 

19.2 

18.2 

8.9 

6.5 

4.4 

6.5 

7.7 

7.5

8.2 

11.1 

14.8 

8.6 

6.6 

7.5 

9.4 

11.0 

12.4 

14.6 

16.8 

17.0 

17.6 

17.7

4.7 

4.7 

4.8 

5.0 

5.0 

5.0 

7.8 

7.5 

6.7 

2.7 

2.6 

2.9 

5.9 

4.1 

3.6

3.7 

3.8 

6.0 

6.7 

5.6 

4.0 

3.8 

3.9 

5.2 

5.6 

4.9 

5.1 

4.6 

5.0

February

387 

387 

388 

392 

383 

289 

135 

82 

191 

299 

56 

173 

387 

394 

379 

361 

396 

452 

206 

356 

349 

475 

434 

241 

444 

374 

497 

504

382 

386 

389 

393 

397 

401 

405 

409 

413 

417 

421 

425 

429 

433 

437 

442 

446 

451 

455 

459 

463 

468 

472 

476 

480 

485 

489 

493

543 

562 

582 

559 

600 

593 

705 

744 

689 

705 

747 

666 

631 

659 

670 

605 

554 

564 

605 

630 

611 

556 

536 

604 

628 

626 

472 

478

17.0

15.8 

15.0 

15.0 

15.4 

15.2 

15.5 

14.5 

15.8 

20.1 

19.9 

15.5 

14.4 

16.4 

17.1 

15.9 

12.0 

12.6 

11.3 

10.9 

10.4 

10.1 

11.9 

11.8 

10.6 

10.1 

5.1 

6.0

4.2 

4.5 

5.5 

6.0 

5.5 

5.2 

7.4 

11.1 

9.6 

8.3 

9.8 

12.7 

9.9 

8.9 

8.2 

6.2 

6.0 

5.4 

6.6 

8.2 

8.2 

6.8. 

6.3 

6.9 

4.3 

4.2 

2.6 

2.9
134 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (cal cm-2 day-1 )

-a 

2

H g

^ r*4

»H jflay> r~t 

la's in 

W

_g"G

O> -a

5

3

Daily

average

sg

!§*« 

<!

§§ 

flff

^2g .h o3 •<

Daily radiation (cal cm-2 day-1)

13 

2

138 0 s m

•3 >> 

3$,i4

ISa •B-fB to O to 

W

0

's

a $

^

Daily 

average

£u

&~

S «> §s

.&« •<

& 5?,-% 

03 K 0

2s i o3

<!

BARRETT RESERVOIR NEAR SAN DIEGO. CALIF. 

1959

1—— —

2— ....

3———

4—— —

5_——— .

6..———

8———

9—— ..

10——

11———

12——.

13——

14———

15———

16———

17———

18——— 

19———

20———

21———.

22———

23——.

24——

25— —

26———

27———

28——.

29——-

30———

31——.

November

146 

305 

322 

338 

200 

368 

346 

246 

284 

356 

326 

342 

335 

336 

328 

307 

348 

338 

332 

342

404 

400 

397 

394 

391 

388 

385 

382 

379 

376 

374 

371 

368 

365 

363 

361 

358 

356 

354 

352

604 

570 

528 

636 

628 

532 

557 

632 

592 

553 

519 

522 

556 

575 

539 

529 

465 

527 

496 

492

15.0 

14.3 

14.4 

14.5 

13.2 

11.9 

15.6 

17.5 

13.5 

14.0 

12.3 

15.5 

15.1 

17.0 

15.1 

17.8 

16.7 

13.8 

14.2 

15.1

6.4 

6.4 

8.1 

11.2 

11.4 

8.9 

5.9 

8.4 

10.6 

6.6

December

331 

323 

334 

324 

338 

308 

333 

125 

160 

173 

304 

317 

153 

301 

299 

295 

283 

293 

225 

59 

57 

151 

72 

65 

83 

309 

299 

182 

310 

288 

293

350 

348 

346 

344 

342 

341 

339 

337 

336 

335 

334 

333 

332 

331 

330 

329 

329 

328 

328 

328 

327 

327 

327 

327 

327 

327 

328 

328 

329 . 

329 

330

509 

522 

552 

567 

508 

532 

612 

659 

590 

580 

530 

539 

539 

461 

480 

481 

506 

493 

464 

486 

490 

503 

545 

532 

502 

445 

459 

468 

514 

578 

557

15.4 

15.7 

11.9 

12.0 

16.1 

16.5 

15.4 

13.5 

11.5 

12.5 

11.3 

10.6 

6.4 

5.7 

7.9 

9.3 

9.6 

11.3 

13.1 

13.0 

10.2 

9.7 

12.3 

11.7 

9.6 

8.1 

6.7 

7.4 

7.7 

6.8 

7.4

8.0 

12.2 

12.2 

8.6 

6.1 

6.1 

4.3 

4.1 

5.6 

6.5 

6.5 

6.1 

8.3 

11.9 

9.0 

9.7 

10.9 

10.9 

6.5 

4.0 

4.4 

5.8 

7.0 

6.6

1960

1— ——

3— ....

4— —— 

5—— —

7.———.

g

10

11

12

1 Q

14

15

16

17——— 

18——— 

19——— 

20——— 

21——— 

22——— 

23——— 

24——— 

25——— 

26——— 

27——— 

28——— 

29——— 

30——— 

31———

January

150 

334 

325 

316 

325 

322 

309 

322 

197 

55 

165 

133 

279 

245 

135 

352 

354 

335 

346 

351 

332 

332 

340 

354 

283 

355 

305 

379 

379 

254 

340

331 

332 

333 

335 

337 

338 

339 

341 

343 

345 

347 

349 

351 

353 

355 

357 

359 

361 

363 

366 

369 

372 

375 

378 

381 

384 

387 

390 

393 

397 

400

522 

439 

516 

503 

480 

502 

539 

539 

623 

631 

665 

568 

493 

529 

473 

480 

473 

493 

492 

519 

526 

564 

579 

562 

612 

586 

535 

532 

540 

545 

544

3.7 

1.7 

3.0 

6.3 

4.2 

5.9 

7.6 

8.4 

8.4 

10.0 

8.5 

6.5 

4.0 

4.6 

3.8 

3.6 

3.8 

4.9 

5.7 

11.2 

9.2 

9.3 

10.8 

10.7 

10.6 

11.5 

8.0 

12.2 

14.0 

9.5 

9.0

5.6 

3.7 

7.0 

4.4 

3.5 

4.2 

5.3 

6.4 

5.6 

10.7 

9.1 

8.2 

6.4 

6.7 

7.4 

5.8 

5.3 

5.5 

4.5 

3.8 

5.1 

5.8 

8.8 

8.5 

10.0 

11.3 

8.8 

4.8 

4.2 

5.6 

6.8

February

314

245 

242 

395 

324 

371 

276 

130 

266 

145 

415 

413 

432 

455 

452 

438 

470 

426 

320 

462 

475 

403 

378 

472 

384 

101 

220 

157 

167

403 

406 

408 

414 

417 

421 

425 

429 

433 

437 

441 

445 

449 

453 

457 

461 

465 

469 

474 

478 

483 

487 

491 

496 

500 

504 

508 

512 

515

620 

585 

619 

598 

604 

631 

590 

648 

605 

592 

523 

490 

507 

491 

503 

521 

501 

529 

520 

508 

576 

666 

651 

468 

523 

654 

611 

542 

563

9.2 

10.6 

8.0 

11.8 

11.0 

11.5 

11.6 

9.3 

9.2 

7.3 

7.5 

9.5 

7.3 

9.0 

8.6 

9.0 

12.2 

8.2 

6.9 

7.0 

7.8 

10.3 

18.1 

7.7 

5.3 

7.0 

8.9 

7.2 

9.9

8.3 

10.6 

8.6 

10.3 

9.4 

11.3 

12.2 

11.1 

8.6 

7.4 

6.9 

3.8 

5.2 

4.1 

4.1 

5.7 

3.8 

6.6 

7.0 

6.1 

6.4 

8.9 

15.5 

3.1 

6.1 

8.3 

9.0 

8.7 

11.3

Day

Daily radiation (cal cm-2 day-1)

3 «g tn^ & r? I"

•O >. IN

Ufg CO W O3 H

•s o

a'&

34J

•<

Daily 

average

S--" & 

Is

ar

C3 aLS21

ss! •<

Daily raiiation 

(cal cm~2 day-1)

13 

§ 3 g

I'SS m

•rt >. 

&

H S TO .a ^-3

OT O tn H

.2*M

O> -a

3

34J

•<

Daily

average

feO

n^ 

go. S H -M 3

.h S

•<

M *

f"!?

.!:! S3

•<

BARRETT RESERVOIR NEAR SAN DIEGO, CALIF.— Continued 

1960— Continued

March

1— ....

2————

3———

4.. .....

5... ....

6.. _ ..

T. ......

8.......

9.......

10———

11... ...

13——.

14—— 

15———

16......

17———

18———

19

20———.

21———

22———

23———

24———

25......

9fi

27———

28——.

•X!

30——

31———

149 

503 

474 

508 

518 

462 

506 

516 

540 

548 

539 

533 

350 

554 

565 

568 

593 

576 

595 

587 

587 

545 

352 

556 

530 

550 

137 

243 

625 

624 

598

518 

521 

526 

530 

534 

539 

543 

548 

552 

556 

561 

565 

570 

574 

579 

583 

587 

592 

596 

600 

604 

608 

612 

617 

621 

625 

629 

634 

638 

642 

647

643 

577 

578 

586 

598 

608 

594 

582 

563 

581 

590 

624 

636 

629 

559 

562 

563 

616 

605 

627 

638 

635 

654 

689 

700 

723 

716 

623 

584 

610 

625

9.1 

9.8 

11.4 

11.7 

13.3 

13.9 

13.4 

13.0 

12.1 

12.6 

12.4 

12.8 

12.1 

14.0 

13.0 

12.7 

16.5 

15.5 

16.4 

17.0 

16.7 

14.0 

12.8 

12.2 

13.2 

13.3 

11.8 

10.7 

11.1 

12.5 

14.4

10.4 

8.9 

9.6 

8.7 

9.0 

9.7 

10.1 

10.4 

8.4 

8.8 

9.9 

10.2 

11.8 

10.5 

6.1 

5.4 

5.2 

5.6 

6.0 

6.5 

7.4 

9.1 

11.0 

11.1 

12.1 

12.0 

11.8 

10.8 

9.7 

10.3 

11.3

May

l._ .....

2.......

3.. .....

4.......

5.......

6.......

7—— ...

8.......

9——— _

10———

11———

12———

13———

14———

15———

16.———

17— — 

18——— 

19——— 

20——— 

21——— 

22——— 

23——— 

24——— 

25——— 

26——— 

27——— 

28——— 

29——— 

30——— 

31———

688 

640 

146 

184 

716 

713 

700 

722 

722 

710 

717 

718 

679 

580 

201 

223 

590 

611 

723 

753 

755 

755 

774 

593 

755 

736 

693 

710 

676 

704 

719

757 

760 

763 

766 

769 

771 

773 

775 

777 

778 

780 

782 

784 

786 

788 

790 

792 

794 

796 

797 

799 

801 , 803 

804 

805 

807 

808 

809 

810 

811 

813

630 

685 

694 

646 

632 

651 

658 

674 

697 

697 

695 

699 

713 

785 

724 

756 

781 

728 

635 

578 

607 

604 

582 

572 

619 

664 

656 

705 

739 

765 

784

17.6 

13.0 

10.3 

10.6 

12.4 

19.3 

18.7 

19.0 

19.9 

21.8 

22.3 

21.0 

18.3 

15.0 

12.2 

12.8 

15.9 

15.5 

18.0 

18.6 

16.3 

14.1 

13.1 

13.3 

16.1 

19.7 

21.0 

21.1 

17.9 

19.2 

19.2

7.6 

10.2 

10.2 

11.7 

10.4 

9.1 

10-3 

10.0 

11.7 

10.8 

10.0 

9.6 

11.1 

11.4 

12.3 

12.1 

13.4 

12.8 

8.7 

6.3 

8.9 

9.1 

8.8 

10.1 

10.8 

10.0 

9.9 

14.3 

14.1 

14.6 

15.2

April

612 

642 

641 

623 

630 

582 

647 

619 

648 

660 

617 

555 

673 

630 

658 

651 

686 

668 

679 

680 

661 

404 

553 

461 

691 

588 

124 

674 

680 

661

6)1 

6)5 

6)9 

653 

G38 

672 

6'6 

6PO 

6P* 

6J^S 

602 

&T6 

700 

703 

7(16 7'0 

7 - '.l 

7-<* 

721 

724 

728 

731 

733 

736 

739 

742 

7A5 

748 

751 

7o4

623 

596 

610 

637 

649 

680 

647 

678 

668 

644 

630 

582 

590 

598 

590 

640 

623 

629 

613 

658 

607 

613 

570 

594 

547 

557 

642 

597 

608 

645

16.8 

18.1 

17.4 

18.4 

19.2 

17.8 

15.0 

15.8 

15.9 

16.6 

12.2 

10.4 

14.8 

14.9 

14.1 

15.9 

17.8 

18.3 

16.6 

18.0 

15.7 

11.1 

8.0 

9.2 

11.4 

9.6 

10.8 

10.6 

11.1 

15.0

9.3 

5.7 

5.0 

7.3 

7.9 

8.4 

9.1 

11.0 

11.6 

11.1 

9.5 

10.6 

7.2 

6.2 

7.6 

10.5 

6.6 

7.9 

8.1 

9.9 

11.7 

8.5 

8.0 

8.2 

7.4 

8.7 

12.2 

9.1 

8.9 

9.4

June

717

668 

320 

681 

683 

711 

686 

684 

743 

749 

736 

735 

751 

734 

719 

737 

714 

728 

748 

752 

731 

708 

744 

747 

757 

774 

777 

746 

742 

724

8 '4 8'5 

8'S 

8'7 

8'S 

8'S 

8") 

8'9 

810 

810 

810 

811 

8.11 

812 

812 

S?2 

813 

&>.3 

834 

814 

8.14 

814 

8.14 

814 

833 

823 

822 

822 

832 

821

742 

761 

763 

802 

808 

800 

739 

665 

685 

661 

703 

743 

732 

751 

751 

742 

714 

756 

651 

663 719' 

724 

701 

668 

686 

646 

639 

630 

651 

702

20.0 

21.4 

18.6 

19.4 

19.1 

19.2 

20.7 

18.8 

19.3 

20.1 

21.4 

21.3 

22.5 

22.4 

21.3 

22.6 

24.1 

23.2 

23.3 

24.4 

27.0 

26.8 

24.3 

23.3 

24.0 

23.5 

22.7 

23.4 

24.8 

27.3

15.9 

17.1 

16.9 

15.9 

16.8 

17.1 

14.9 

12.8 

12.5 

13.2 

13.5 

15.0 

15.6 

14.6 

16.0 

14.8 

13.0 

13.4 

9.7 

8.1 

7.0 

8.1 

11.4 

10.8 

9.2 

7.8 

7.5 

6.5 

5.4 

7.5
COMPUTATION OF LONG-WAVE AND REFLECTED SOLAR RADIATION 135

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (cal cm-8 day-')

T3

I*

t3 £? !? g&a Ill

w

1 

S

I 

^

Daily 

average

wCV-^

tola

•<

&s

>!§

.6 SB •<

Daily radiation (cal cm-2 day-1 )

•a

ilIs

3£+3 OT 

'S'u to

w

.3

1 •<

Daily 

average

IE 

+"3 §i

-fclel

•<

S ffi^

.a l& OP^ •<

BARRETT RESERVOIR NEAR SAN DIEGO, CALIF.— Continued 

1960— Continued

1———

2.... _

3... _ .

4.. ___

5————

6.......

7—— ...

8.......

9—— ...

10— —

11.———

12......

13......

14......

15— —

16———

17——

18———

19

20......

91

22......

OQ

24......

OK

26......

97

OR

OQ

on

31......

1— — 2.......

3.......

4————

5————

6————

7————

8————

9......

10... ...

11— —

12......

13......

14——. 

15... ...

16——— 

17——— 

18——— 

19...... 

20...... 

21...... 

22.——— 

23——— 

24...... 

25 .. 

26...... 

27...... 

28——— 

29...... 

30...... 

31......

July

609 

723 

764 

768 

751 

743 

750 

755 

767 

730 

740 

738 

771 

717 

697 

685 

676 

684 

596 

685 

606 

621 

639 

666 

661 

451 

428 

574 

661 

655 

688

821 

820 

820 

819 

81$ 

817 

816 

815 

814 

813 

812 

811 

810 

808 

807 

806 

805 

804 

803 

802 

801 

800 

799 

798 

797 

796 

794 

792 

790 

788 

786

712 

708 

649 

648 

662 

655 

623 

665 

639 

669 

663 

686 

671 

749 

738 

763 

798 

819 

814 

795 

824 

791 

769 

746 

763 

804 

797 

808 

826 

744 

728

27.4 

25.9 

22.2 

20.0 

20.7 

22.7 

22.1 

22.5 

21.4 

22.6 

24.3 

24.2 

23.3 

27.3 

29.6 

31.3 

30.8 

30.1 

32.3 

29.1 

29.1 

28.5 

27.4 

25.3 

25.1 

25.7 

25.1 

26.7 

26.3 

25.4 

24.9

9.5 

9.6 

9.9 

9.3 

10.6 

10.1 

9.1 

9.9 

8.3 

9.4 

9.6 

10.2 

10.7 

9.4 

9.9 

10.0 

11.1 

13.0 

11.9 

14.6 

15.3 

16.3 

14.9 

12.7 

11.6 

12.8 

18.5 

18.0 

18.1 

16.1 

14.9

September

532 

500 

548 

569 

536 

566 

580 

558 

546 

309 

571 

513 

572 

555 

562 

566 

590 

345 

400 

545 

518 

566 

533 

530 

543 

538 

525 

569 

525 

518

696 

692 

688 

684 

680 

676 

672 

668 

664 

660 

657 

653 

649 

645 

641 

638 

634 

630 

626 

621 

617 

612 

608 

603 

599 

595 

590 

586 

581 

577

721 

760 

755 

682 

758 

686 

751 

792 

766 

894 

796 

764 

778 

707 

697 

682 

590 

672 

649 

675 

667 

610 

640 

678 

632 

624 

656 

613 

616 

609

23.5 

26.2 

27.1 

26.9 

26.5 

25.1 

25.9 

26.1 

25.0 

25.6 

27.9 

29.0 

27.8 

24.1 

20.2 

17.9 

18.0 

19.1 

22.4 

21.0 

18.8 

17.3 

23.8 

24.2 

20.6 

22.5 

23.3 

20.3 

17.8 

15.8

17.0 

17 7 

15.3 

15.0 

13.6 

13.2 

12.2 

13.4 

12.7 

17.2 

23.6 

16.7 

14.0 

16.0 

12.2 

12.1 

11.3 

19.3 

14.7 

13.5 

15.2 

10.6 

7.1 

6.6 

8.7 

7.9 

7.1 

6.8 

9.9 

9.8

August

701 

698 

716 

676 

674 

631 

640 

636 

599 

453 

613 

640 

655 

660 

660 

677 

640 

628 

649 

599 

633 

583 

671 

723 

660 

655 

705 

682 

619 

604 

535

784 

782 

780 

778 

776 

774 

772 

770 

768 

766 

763 

760 

757 

755 

752 

749 

746 

743 

740 

737 

734 

731 

727 

724 

721 

718 

715 

711 

707 

703 

700

668 

685 

664 

699 

723 

755 

769 

780 

819 

796 

779 

749 

730 

716 

710 

698 

712 

767 

740 

745 

728 

733 

696 

697 

615 

637 

657 

663 

709 

733 

786

25.8 

26.6 

26.6 

24.4 

22.9 

23.6 

24.6 

22.6 

23.1 

24.0 

25.8 

23.8 

24.9 

24.3 

23.0 

20.8 

23.2 

27.7 

26.4 

25.6 

26.6 

21.2 

20.1 

20.9 

18.7 

19.2 

19.1 

20.6 

22.2 

24.1 

23.1

10.9 

7.3 

8.4 

10.3 

12.5 

14.6 

15.1 

15.9 

16.5

12.2 

10.9 

11.8 

13.6 

13.9 

15.1

October

500 

509 

493 

359 

482 

449 

461 

193 

156 

442 

506 

469 

416 

403 

436 

394 

441 

425 

413 

446 

443 

342 

398 

414 

425 

411 

398 

392 

395 

411 

397

573 

568 

564 

560 

556 

551 

547 

543 

538 

534 

529 

525 

520 

516 

512 

508 

504 

500 

496 

491 

487 

483 

479 

474 

469 

465 

462 

458 

454 

450 

445

609 

604 

653 

693 

655 

695 

687 

710 

581 

570 

545 

567 

601 

623 

528 

509 

541 

547 

552 

599 

564 

629 

651 

603 

589 

598 

596 

572 

557 

570 

542

16.4 

17.1 

19.3 

20.6 

22.8 

24.1 

20.6 

15.2 

14.4 

12.8 

11.9 

11.9 

12.1 

13.8 

15.1 

14.4 

14.3 

13.4 

16.6 

18.3 

19.2 

19.4 

16.9 

14.9 

16.2 

15.8 

13.1 

14.6 

14.9 

16.6 

15.9

10.1 

10.2 

10.5 

11.2 

12.3 

12.5 

14.6 

13.5 

12.4 

9.3 

9.8 

9.8 

10.6 

11.3 

4.5 

6.0 

7.6 

7.5 

8.3 

8.0 

6.4 

6.8 

13.7 

11.9 

10.3 

9.4 

10.1 

9.6 

8.9 

6.2 

7.4

Day

Daily radiation 

(cal cm-2 day1)

•e

2

j!

|Q >> 

3>M

4fl (JJ 

111

w

0*»4

1 

1

3

Daily 

average

feOnSH C3 53 N

£03

•<

S ILssS1 

T2S ta n-ii •4

Daily radiation (cal cm-2 day-i)

•a

GQ.2 Is

« &>

2^i§§ 3-2 "3 OT 0 M 

W

»

1 

1•<

Daily 

average

IEa« Is

.fats •<

?ll

.fcin-S •<

BARRETT RESERVOIR NEAR SAN DIEGO, CALIF.— Continued 

1960— Continued

1.. __ .

2.. .....

3.......

4.

5.......

6.......

7.......

8.. __ .

9__

10———

11———

12.... ._

13———

14———

15— ...

16———

17———

18———

19———

20— _

21......

22......

23......

24... ..

25......

26———

27———

28......

29.. __

30——— aiNovember

397 

289 

52 

176 

154 

274 

167 

360 

373 

330 

355 

114 

279 

244 

323 

340 

362 

344 

341 

346 

339 

343 

340 

341 

341 

119 

233 

336 

179 

276

441 

437 

433 

429 

425 

422 

418 

414 

410 

' 407 

404 

400 

397 

394 

391 

388 

385 

382 

379 

376 

374 

371 

368 

365 

363 

361 

358 

356 

354 

352

549 

622 

638 

595 

699 

587 

595 

526 

486 

535 

512 

621 

553 

477 

536 

474 

499 

518 

518 

499 

485 

504 

493 

492 

480 

597 

508 

460 

513 

559

15.6 

14.9 

12.5 

12.6 

15.1 

13.5 

11.3 

10.2 

11.9 

11.7 

11.1 

8.8 

11.1 

8.0 

9.3 

10.8 

10.6 

10.6 

10.6 

12.1 

11.4 

10.7 

10.8 

11.3 

10.8 

7.4 

7.8 

7.6 

9.9 

10.4

8.3 

8.9 

12.7 

14.2 

13.9 

12.8 

9.7 

9.2 

9.4 

7.7 

9.4 

9.4 

10.4 

8.7 

6.3 

5.1 

4.2 

5.6 

7.0 

6.2 

5.4 

5.7 

5.0 

4.3 

4.5 

7.3 

8.3 

4.0 

5.1 

5.5

December

207 

190 

154 

318 

320 

332 

329 

83 

317 

317 

284 

311 

305 

310 

313 

304 

314 

314 

310 

303 

301 

305 

314 

309 

260 

312 

310 

181 

269 

314 

302

350 

348 

346 

344 

342 

341 

339 

337 

336 

335 

334 

333 

332 

331 

330 

329 

329 

328 

328 

328 

327 

327 

327 

327 

327 

327 

328 

328 

329 

329 

330

582 

534 

523 

492 

443 

392 

437 

537 

427 

528 

546 

487 

494 

485 

478 

488 

496 

507 

509 

528 

496 

528 

506 

503 

512 

507 

514 

549 

509 

476 

485

12.2 

8.3 

7.3 

6.4 

6.3 

6.3 

3.6 

2.7 

3.1 

4.7 

8.8 

8.7 

10.1 

7.8 

6.5 

7.3 

9.4 

10.9 

12.3 

15.3 

12.0 

13.1 

12.2 

12.3 

11.4 

11.4 

10.2 

9.5 

10.4 

8.8 

6.6

8.0 

9.3 

7.2 

7.1 

4.2

3.8 

5.3 

4.7 

6.6 

8.1 

6.0 

4.9 

6.7 

5.9 

5.4 

4.3 

5.4 

9.1

mi

1.. .

2

3..._ .

4.......

5———— 6. _

7——

8. _ ..

Q

10—— ___

11——

12.....

10

14...

15......

16———

17— .__ 

18——— 

19———

20——— 

21——— 

22——— 

23———

24——— 

25___ . 

26.._. __ 

27——— 

28— ... 

29...... 

30——— 

31———

January

323 

316 

329 

212 

150 

330 

323 

334 

314 

329 

335 

331 

337 

330 

330 

340 

329 

243 

259 

153 

195 

139 

308 

340 

242 

50 

141 

275 

213 

283 

352

331 

332 

333 

335 

337 

338 

339 

341 

343 

345 

347 

349 

351 

353 

355 

357 

359 

361 

363 

366 

369 

372 

375 

378 

381 

384 

387 

390 

393 

397 

400

449 

469 

442 

508 

532 

475 

463 

466 

478 

509 

496 

472 

493 

521 

524 

525 

532 

555 

598 

598 

613 

665 

551 

526 

658 

603 

587 

566 

577 

576 

580

6.1 

7.6 

7.4 

8.3 

9.8 

9.4 

9.5 

10.1 

10.7 

11.9 

12.6 

10.0 

10.5 

12.6 

13.6 

15.3 

14.8 

13.7 

16.4 

13.8 

12.3 

12.6 

10.8 

9.0 

10.8 

10.0 

10.0 

8.4 

7.9 

10.5 

11.2

5.0 

5.0 

6.7 

6.1 

7.3 

9.7 

11.6 

10.0 

8.7 

6.6 

6.9 

8.7

February

343

304 

366 

403 

413 

257 

220 

392 

380 

398 

376 

365 

420 

439 

438 

148 

296 

400 

472 

457 

454 

465 

476 

488 

478 

454 

493 

490

403 

406 

408 

414 

417 

421 

425 

429 

433 

437 

441 

445 

449 

453 

457 

461 

465 

469 

474 

478 

483 

487 

491 

496 

500 

504 

508 

512

613

584 

546 

477 

474 

526 

555 

522 

554 

570 

567 

563 

525 

530 

570 

627 

605 

546 

460 

527 

528 

529 

478 

481 

486 

549 

488 

513

11.4 

11.3 

10.5 

12.1 

12.7 

9.1 

7.8 

8.8 

11.7 

13.9 

12.3 

10.3 

8.7 

11.5 

11.2 

9.6 

9.P 

7.8 

9.7 

12. F 

13.4 

12.5 

11.1 

13.7 

11.1 

9.C 

10. f

12. e

10.9 

8.4 

9.1

7.4 

8.0 

7.6 

7.1 

8.7 

8.8 

7.0 

6.3 

7.7 

9.4 

9.8 

7.6 

3.3 

4.3 

4.6 

5.7
136 STUDIES OF EVAPORATION

TABLE 3.—Daily values of measured solar, estimated clear-sky solar, and atmospheric radiation, and daily average air temperature and

air-vapor pressure at various localities for time shown—Continued

Day

Daily radiation (cal cm-2 day-i)

1| | S

"O fc1 i"?

.3 VA

to "3 tn 

W

o

I

3

Daily 

average

ios"£ 

Is3 s

Ii 5 if A&S •<

Daily radiation (cal cm-2 day-')

•8

Si s 8

73 >> !#*lb

tim

w

0

1

I

•^

Daily 

average

icOSo D.^- Ii

.tats •<

ILCO OJ.fi ist

«;

BARRETT RESERVOIR NEAR SAN DIEGO, CALIF.— Continued 

1961— Continued

I...... -

2— ——

3— ——

4———

6.... ...

7— — .

8— ....

9—— —

10———

11——

12——

13———

14———

15———

16———

17——.

1Q

19

20———

21——.

22———

23———

24......

25———

26———

27———

28.——

29———

30——

31———

1—— _„

2————

3— — .

4————

5— ....

6.. _ ..

7—— —

8— ....

9— ... .

10———

11———

12——— 

13———

14———

15———

16——— 

17——

18——— 

19——— 

20——— 

21——— 

22——— 

23——— 

24——— 

25——— 

26——— 

27—— 

28——— 

29——— 

SO—- 

SI———

March

490 

422 

173 

128 

341 

384 

535 

495 

428 

512 

512 

448 

515 

527 

229 

490 

296 

552 

561 

553 

561 

556 

558 

215 

215 

468 

523 

200 

558 

606 

582

517 

521 

526 

530 

534 

539 

543 

548 

552 

556 

561 

565 

570 

574 

579 

583 

587 

592 

596 

600 

604 

608 

612 

617 

621 

625 

629 

634 

638 

642 

647

531 

591 

599 

593 

660 

625 

488 

527 

555 

525 

544 

588 

555 

559 

528 

481 

620 

529 

547 

555 

580 

594 

637 

610 

599 

620 

667 

540 

552 

562 

638

16.2 

12.8 

9.2 

8.4 

10.6 

10. 1 

10.2 

13.2 

13.2 

11.1 

10.6 

12.4 

13.8 

13.7 

8.7 

9.9 

8.8 

9.2 

10.8 

12.7 

12.5 

12.7 

11.1 

9.7 

8.5 

9.4 

10.6 

8.4 

9.4 

9.5 

12.2

6.6 

9.0 

10.0 

10.4 

9.0 

5.2 

3.9 

6.0 

6.5 

8.4 

8.7 

8.3 

8.4 

9.5 

8.6 

9.0 

7.7 

7.0 

6.8 

8.4 

8.8 

8.8 

10.1 

8.6 

8.7 

9.4 

9.7 

8.1 

8.5 

10.1

May

699 

704 

163 

236 

696 

647 

618 

718 

629 

575 

739 

610 

731 

738 

728 

692 

716 

725 

610 

731 

744 

740 

725 

737 

685 

731 

743 

628 

745 

734 

497

757 

760 

763 

766 

769 

771 

773 

775 

777 

778 

780 

782 

784 

786 

788 

790 

792 

794 

796 

797 

799 

801 

803 

804 

805 

807 

808 

809 

810 

811 

813

623 

670 

710 

653 

611 

674 

621 

611 

657 

639 

658 

676 

611 

640 

640 

702 

689 

708 

646 

603 

634 

638 

668 

653 

719 

671 

664 

713 

666 

603 

691

17.1 

16.1 

11.1 

9.9 

12.2 

11.9 

13.9 

19.0 

20.6 

17.6 

14.4 

12.2 

14.6 

16.0 

16.1 

14.9 

14.9 

15.2 

14.7 

15.3 

16.6 

15.5 

15.9 

14.9 

14.7 

16.1 

15.7 

14.3 

14.8 

14.7 

13.2

9.9 

10.7 

10.8 

10.1 

9.2 

9.3 

10.8 

6.5 

6.0 

8.1 

10.0 

8.7 

9.3 

8.7 

8.9 

10.7 

10.4 

10.9 

10.3 

9.9 

9.8 

9.3 

10.2 

10.2 

10.6 

10.9 

10.5 

9.9 

9.0 

8.5 

10.0

April

604 

593 

617 

622 

580 

551 

236 

650 

650 

322 

649 

667 

653 

657 

671 

652 

659

no

376

710 

709 

.701 

691 

637 

707 

706 

704

651 

655 

659 

663 

668 

672 

676 

680 

684 

688 

692 

696 

700 

703 

706 

710 

714

728 

731 

733 

736 

739 

742 

745 

748 

751 

754

623 

602 

614 

658 

730 

740 

682 

545 

613 

716 

576 

623 

621 

618 

588 

603 

653

581 

665 

599 

553 

540 

573 

577 

576 

579 

612

14.8 

18.8 

21.7 

21.1 

14.7 

14.9 

11.9 

14.2 

13.4 

11.5 

15.9 

12.8 

13.3 

14.3 

18.4 

20.2 

19.5

11.8 

12.0 

10.5 

10.9 

10.4 

14.2 

15.8 

17.0 

17.7 

17.3

10.8 

7.9 

8.8 

8.6 

12.5 

12.1 

10.8 

7.2 

7.2 

10.2 

7.5 

8.0 

9.3 

9.6

8.5 

9.2 

8.0 

6.8 

7.2 

6.8 

5.8 

5.1 

6.4 

8.0

June

385 

737

718 

733 

725 

656 

739 

724 

728 

749 

746 

733 

725 

718 

731 

734 

713 

720 

704 

713 

700 

707

733 

733

704 

717 

762

814 

815 

816 

817 

818 

818 

819 

819 

820 

820 

820 

821 

821 

822 

822 

822 

823 

823 

824 

824 

824 

824

823 

822 

822 

822 

821

668 

637 

701 

699 

724 

705 

696 

741 

728 

676 

680 

722 

741 

780 

760 

756 

777 

726 

760 

774 

762 

792

704 

716 

729 

700 

694

13.1 

14.6 

17.2 

17.0 

16.4 

16.5 

17.3 

16.2 

17.4 

16.9 

18.3 

18.8 

21.6 

25.8 

27.6 

24.9 

25.1 

25.1 

25.1 

23.9 

21.4 

21.4

24.8 

25.6 

26.4 

25.8 

24.1

9.9 

10.4 

11.0 

12.1 

12.0 

11.5 

11.7 

12.7 

12.1 

11.3 

10.9 

11.7 

12.2 

12.1 

10.7 

11.4 

12.2 

10.6 

9.5 

11.9 

11.9 

12.9

9.0

7.7 

7.4

Day

Daily radiation (cal cm-2 day-i)

•o 

ll

s

•gtf

H£n

$ OM

o

1 

I

•<

Daily

average

fe£

nSSg ® a «B 

.a* <!

Ii 

?2f ia-S 

•<

Daily radfation 

(cal cm-2 day-')

•d

to S

Is

3£ IS* S 3 *

111 

W

1

a

i•4-3

•<

Daily 

average

<8^

S i 

.a «

«;

.ti !|I p?~' •<

BARRETT RESERVOIR NEAR SAN DIEGO, CALIF.— Continued 

1961— Continued

1— ——

2—— —

3—— —

4— ——

5— — —

6.— ...

7— — .

8——— .

9————

10———

11———

12———

13.———

14———

15———

18———

17— —

18———

19———

20———

21 ———

22——.

23———

24———

25———

26———

27——

28———

29———

30———

31———

1 —— —

2— ....

3—— —

4.. __ .

5— ——

6— ——

7— — -

8— ——

9_ ——— .

10———

11———

12——— .

13———

14———

15———

16———

17——— 

18—— 

19——— 

20——. 

21——— 

22—— .. 

23———

24———

25———

26———

27——— 

28———

30.——

31———

July

527 

651 

734 

746 

735 714- 

697 

695 

685 

684 

696 

681

681 

527 

663 

395 

685 

703 

715 

685 

683 

685 

666 

679 

658 

458 

322 

273 

688

820 

820 

819 

818 

817 

816 

815 

814 

8J 3 

812 

811 

810

807 

806 

805 

804 

803 

802 

801 

800 

799 

798 

797 

796 

794 

792 

790 

788 

786

770 

759 

706 

703 

705 

785 

792 

832 

834 

804 

797 

833

826 

826 

851 

811 

790 

766 

722 

775 

782 

774 

813 

804 

816 

771 

811 

785 

758

20.6 

18.9 

18.8 

20.0 

22.0 

25.9 

28.5 

26.6 

27.2 

26.8 

23.9 

24.8

25.8 

24.4 

25.7 

25.4 

27.0 

23.4 

20.1 

19.1 

20.6 

21.9 

23.2 

24.4 

24.9 

23.1 

21.3 

20.7 

22.4

12.9 

13.1 

12.6 

11.7 

10.1 

10.1 

8.3 

12.0 

12.4 

13.5 

14.6 

15.3

14.1 

15.2 

15.6 

13.6 

13.6 

13.2 

13.7 

13.7 

14.3 

15.1 

16.3 

16.4 

17.1

11.5

September

621 

623 

638 

630 

604 

583 

606 

619

560 

557 

538 

551 

566 

554 

446 

554 

553 

503 

161 

218 

548 

538 

542 

532 

524 

519 

530 

528

696 

692 

688 

684 

680 

676 

672 

668

657 

653 

649 

645 

641 

638 

634 

630 

626 

621 

617 

612 

608 

603 

599 

595 

590 

586 

581 

577

686 

647 

595 

593 

620 

664 

610 

639

714 

712 

712 

682 

681 

756 

725 

608 

680 

740 

755 

701 

595 

613 

643 

656 

663 

644 

604 56*9

22.4 

19.8 

22.9 

23.0 

22.1 

22.8 

20.8 

16.8

25.1 

23.1 

20.9 

19.9 

19.6 

18.5 

16.5 

15.8 

15.2 

16.7 

14.6 

14.4 

14.9 

17.3 

20.8 

22.9 

23.8 

22.2 

19.4 

18.6

9.5 

9.1

9.0 

10.3

9.4 

11.4 

15.8 

16.2 

15.7 

15.4 

13.9 

12.3 

12.1 

12.9 

12.5 

10.9 

10.9 

11.3 

10.0 

7.7 

6.8 

8.7 

8.8 

7.8

August

688 

649 

649 

337 

598 

656 

658 

650 

343 

631 

649 

641 

639 

637 

541 

628 

615 

293 

368 

464 

459 

566 

617 

631 

625 

619 

631 

641 

631 

634 

617

784 

782 

780 

778 

776 

774 

772 

770 

768 

766 

763 

760 

757 

755 

752 

749 

746 

743 

740 

737 

734 

731 

727 

724 

721 

718 

715 

711 

707 

703 

700

747 

785 

833 

808 

856 

805 

797 

816 

792 

800 

771 

755 

760 

737 

767 

766 

800 

784 

812 

830 

849 

826 

793 

755 

745 

727 

-687 

652 

675 

657 

677

22.9 

24.1 

26.2 

25.8 

25.5 

26.2 

25.9 

26.2 

23.1 

24.5 

24.9 

24.8 

23.8 

22.1 

21.8 

23.5 

25.4 

22.7 

23.5 

25.9 

27.1 

27.0 

25.6 

24.9 

23.8 

23.4 

21.8 

19.4 

19.1 

18.9 

20.2

14.3 

20.9 

19.6 

17.2 

16.4 

15.8 

18.1 

15.7 

13.1 

13.7 

14.3 

14.6 

15.8 

15.3 

14.9 

17.5 

19.8 

18.6 

17.7 

18.0 

15.5 

14.1 

12.6 

12.3 

11.6 

11.7 

12.9 

12.8 

12.2

October

496 

508 

482 

484 

407 

488 

486 

68 

452 

475 

473 

472 

470 

374 

419 

347 

437 

422 

371 

424 

313 

418 

421

573 

568 

564 

560 

556 

551 

547 

543 

538 

534 

529 

525 

520 

516 

512 

508 

504 

500 

496 

491 

487 

483 

479

577 

582 

598 

638 

648 

593 

637 

557 

568 

574 

601 

615 

641 

695 

719 

665 

664 

653 

646 

675 

734 

628 

558

19.1 

22.4 

23.6 

23.9 

21.1 

19.2 

13.9 

7.8 

9.4 

12.4 

14.5 

17.2 

23.2 

28.2 

28.4 

22.8 

20.2 

18.1 

17.1 

15.5 

15.2 

14.9 

14.6

8.8 

5.4 

4.9 

6.2 

8.1 

7.8 

10.9 

9.0 

8.3 

7.7 

8.3 

7.3 

5.6 

7.8 

8.4 

7.3 

8.4 

10.1 

11.1 

11.9 

12.2 

11.7 

8.3

U.S. GOVERNMENT PRINTING OFFICE; 1964 O—709500