Evaporation Stations 

Standard daily pan evaporation is measured using the four-foot diameter Class A evaporation pan. 

The pan water level reading is adjusted when precipitation is measure to obtain the actual evaporation. 

Most Class A pans are installed above ground, allowing effects such as radiation on the side walls and 

heat exchnges with the pan material. These effects tend to increase the evaporation totals. The amounts 

can then be adjusted by multiplying the totals b 0.70 or 0.80 to more closely estimate the evaporation 

from naturally existing urfaces such as a shallow lake, wet soil or other moist natural surfaces. 

Many stations do not measure pan evaportation during winter months. A "0.00" total indicates no measuement is taken. 

Stations marked with an asterisk (*) have estimated totals computed from meteorological measurements using a 

form of the Penman equation. 

Click on a State: Arizona, California , Colorado, Hawaii & Pacific Islands, ldihQ, Montana, . 

New Mexico, Oregon, Utah , Washington, WVoming 

ALASKA 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT 

BROOKS RIVER 1967-1990 0.00 0.00 0.00 0.00 0.00 2.48 2.88 1.63 0.73 0.00 

CENTRAL 2 1962-2005 0.00 0.00 0.00 0.00 0.00 3.97 4.00 2.43 2.19 0.00 

COPPER CENTER 1961-1982 0.00 0.00 0.00 0.00 0.00 6.03 4.06 3.14 1.71 0.00 

JUNEAU AP 1949-2005 0.00 0.00 0.00 0.00 3.33 3.29 3.82 3.14 1.02 0.00 

MATANUSKA AES 1917-2005 0.00 0.00 0.00 0.00 4.22 4.44 3.92 3.05 1.83 0.00 

MC GRATH WB AIRPORT 1939-2005 0.00 0.00 0.00 0.00 4.20 4.42 3.65 2.29 1.40 0.00 

MCKINLEY PARK 1949-2005 0.00 0.00 0.00 0.00 0.00 2.96 2.55 1.75 0.53 0.00 

OIL WELL ROAD E p 1967-1974 0.00 0.00 0.00 0.00 0.00 5.17 3.83 2.81 1.40 0.00 

OLD EDGERTON 1970-1996 0.00 0.00 0.00 0.00 3.31 4.56 4.16 3.04 1.65 0.00 

PALMER AAES 1949-2005 0.00 0.0e e.ee e.ee 4.44 4.71 4.12 2.96 1.75 0.ee 

RAMPART 2 1963-1978 0.00 0.00 0.00 0.00 4.23 4.56 3.79 2.56 1.54 0.00 

COLLEGE UNIV EXP STN 1931-2005 0.00 0.00 0.00 0.00 4.25 5.04 4.56 2.82 1.38 0.00 

ARIZONA 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT 

BARTLETT DAM 1939-2005 3.92 4.92 7.10 10.02 13.77 16.21 15.56 13.95 12.10 9.66 

BLACK RIVER PUMPS 1948-2005 0.00 0.00 0.00 6.93 8.83 10.12 7.99 7.02 5.70 3.94 

DAVIS DAM# 2 1958-1977 7.49 7.46 9.75 12.78 16.71 19.48 19.87 17.91 14.64 12.03 

DAVIS DAM 1948-1961 3.54 5.13 7.60 9.30 11.33 13.33 13.14 12.15 9.51 7.24 

DOUGLAS 1948-2005 0.00 0.00 0.00 11.34 13.19 13.55 19.66 19.27 8.18 6.44 

FORT VALLEY 1909-2005 0.00 0.00 0.00 0.00 5.86 7.37 6.03 4.91 3.35 0.00 

GRAND CANYON NATL PARK 1957-1977 0.00 0.00 e.00 0.00 6.94 10.45 8.79 8.12 6.83 4.91 

GRAND CANYON N P 2 1976-2005 0.00 0.00 0.00 0.00 7.46 9.80 8.94 7.29 6.10 4.45 

HAWLEY LAKE 1967-1988 0.00 0.00 0.00 0.00 7.57 8.55 6.89 5.48 4.68 0.0e 

MANY FARMS SCHOOL 1951-1975 0.00 3.66 5.45 9.18 12.23 15.14 12.87 10.88 9.40 6.54 

MC NARY 2 N 1933-2005 0.00 0.00 0.00 0.00 7.86 8.25 6.60 5.98 4.90 3.97 

MESA 1896-2005 3.03 4.02 6.11 8.64 11.33 12.67 13.10 11.87 9.69 6.81 

NOGALES 6 N 1952-2005 3.59 4.46 7.91 9.35 11.91 13.31 10.00 8.28 8.06 7.17 

PAGE 1957-2005 0.00 2.60 5.84 8.27 10.72 12.86 13.06 11.38 8.42 5.13 

ROOSEVELT 1 WNW 1905-2005 2.44 3.54 5.90 8.64 11.96 14.50 14.36 12.27 10.10 6.78 

SACATON 1908-2005 3.83 5.15 7.51 10.06 13.56 14.89 13.69 12.05 10.20 7.91 

SAFFORD AGRICULTRL CTR 1948-2805 2.63 3.83 7.14 10.54 13.81 15.38 13.13 10.68 8.73 5.90 

SAN CARLOS RESERVOIR 1948-2005 2.25 3.27 5.66 8.40 11.70 13.94 13.43 11.40 9.23 6.31 

SIERRAANCHA 1913-1979 2.19 2.93 4.58 6.42 8.97 10.94 10.39 8.88 8.00 6.22 

SNOWFLAKE 15 W 1965-1998 0.00 0.00 0.00 0.00 11.03 14.38 11.29 9.12 7.96 6.45 

STEWART MOUNTAIN 1948-2805 3.52 4.56 6.94 10.04 13.11 14.27 14.44 13.10 10.69 7.95 

TEMPE A S U 1953-2085 1.56 2.93 4.79 7.04 9.44 10.85 10.99 9.92 7.63 5.14 

TUCSON UNIV OF ARIZONA 1894-2005 3.25 4.57 6.95 9.88 12.87 14.91 13.17 11.65 10.35 7.81 

TUCSON U OF ARIZ # 1 1982-2005 3.94 4.68 7.53 10.57 14.14 16.51 14.61 12.17 10.71 8.05 

WAHWEAP 1961-2005 1.95 2.77 6.30 9.42 12.82 14.94 15.26 13.31 10.06 7.06 

WHITERIVER 1 SW 1900-2085 1.69 2.94 5.84 8.01 9.92 11.70 9.48 8.47 7.68 5.87 

WINKELMAN 6 S 1942-1980 3.12 4.03 7.00 9.98 12.40 13.90 11.19 9.84 9.56 7.51 

YUMA CITRUS STATION 1920-2005 3.58 4.36 6.81 9.17 11.75 13.19 13.85 12.28 9.51 6.91 

NOV DEC 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

NOV DEC 

5.86 4.47 

0.00 0.00 

8.40 7.80 

5.38 3.88 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

0.00 0.00 

3.26 2.16 

0.00 0.00 

4.15 2.96 

4.49 3.57 

2.29 0.00 

3.68 2.32 

4.94 3.63 

3.28 2.52 

3.53 2.18 

3.50 2.37 

3.40 0.00 

4.53 3.88 

2.56 1.44 

4.73 3.37 

4.93 3.23 

3.69 2.60 

3.51 2.54 

4.31 2.94 

4.43 3.37 

YEAR 

7.72 

12.59 

14.94 

14.60 

17.46 

15.96 

7.79 

13.21 

16.72 

17.98 

16.68 

18.05 

YEAR 

117.54 

50.53 

154.32 

101.53 

73.63 

27.52 

46.04 

44.04 

33.17 

90.77 

37.56 

94.38 

91.20 

80.57 

96.49 

107.42 

97.57 

91.30 

75.39 

63.63 

186.23 

74.29 

183.51 

111.07 

100.18 

77.65 

95.78 

99.21 
CALIFORNIA 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

ANTIOCH PUMP PLANT 3 1955-2005 1.17 1.99 4.25 6.27 8.96 10.84 11.60 10.06 7.77 4.91 2.07 1.22 71.11 

AUBURN DAM PROJECT 1972-1984 1.42 1.89 3.13 4.89 7.73 10.08 11.66 10.70 8.08 5.00 1.97 1.36 67.91 

AVENAL 9 SSE 1955-1961 1.80 2.90 6.20 9.39 12.96 16.73 18.67 16.37 12.61 8.05 3.89 2.44 112.01 

BACKUS RANCH 1948-1963 2.85 3.86 6.77 9.80 12.69 15.93 16.92 15.95 12.19 8.01 4.25 2.98 112.20 

BEAUMONT PUMPING PLANT 1948-1975 2.90 3.29 4.08 5.03 6.40 8.15 10.64 9.97 7.90 5.87 3.22 2.90 70.35 

BEAUMONT 1 E 1948-2001 3.10 3.73 4.99 5.23 7.60 9.31 10.97 10.66 8.85 6.53 5.16 3.95 80.08 

BERRYESSA LAKE 1957-1970 1.53 2.15 3.79 5.82 8.90 11.00 13.22 12.06 8.67 5.72 2.48 1.66 77.00 

BOCA 1948-2005 0.00 0.00 0.00 0.00 6.83 8.52 10.01 9.09 6.48 4.32 0.00 0.00 45.25 

BRANNAN ISLAND 1968-1977 1.15 1.74 4.36 7.03 10.49 12.39 13.51 12.02 9.03 4.80 1.83 1.08 79.43 

CACHUMA LAKE 1952-2005 2.44 3.53 4.41 6.01 7.55 8.56 9.50 8.98 7.00 5.42 3.49 2.79 69.68 

CAMP PARDEE 1948-2005 0.72 1.12 2.32 4.18 7.04 9.43 11.17 9.50 6.51 3.77 1.40 0.72 57.88 

CHICO EXPERIMENT STN 1906-2005 1.26 2.13 3.82 5.63 8.28 10.11 11.48 9.71 7.36 4.46 2.09 1.30 67.63 

CHULA VISTA 1948-2005 2.81 3.45 5.03 6.06 6.76 6.96 7.63 7.48 6.21 5.02 3.58 2.78 63.77 

COW CREEK 1948-1961 3.21 5.62 9.78 13.98 17.25 21.37 21.89 20.17 15.36 10.71 4.91 3.85 148.10 

DAVIS 1 WSW 1917-2005 1.49 2.34 4.54 7.13 10.19 12.17 12.77 11.28 9.08 6.35 2.89 1.45 81.68 

DEATH VALLEY 1961-2005 3.93 5.38 9.10 13.00 16.76 19.11 20.98 18.86 13.95 9.78 5.54 3.75 140.14 

DUTTONS LANDING 1955-1977 1.42 2.09 3.87 5.70 7.74 9.34 9.34 8.27 6.75 4.65 2.25 1.46 62.88 

FALL RIVER MILLS INTAKE 1948-2005 0.00 0.00 2.47 5.80 7.54 9.48 12.14 10.57 7.59 3.78 1.14 0.00 60.51 

FERNDALE 2 NW 1963-1973 0.70 1.17 2.26 3.21 3.95 4.38 4.49 4.07 3.59 2.06 1.04 0.72 31.64 

FOLSOM DAM 1955-1993 0.92 1.90 3.47 5.21 8.07 9.91 11.12 9.93 7.45 4.89 2.06 1.25 66.18 

FRIANT GOVERNMENT CAMP 1948-2005 1.46 2.12 3.82 5.89 9.42 12.07 13.96 12.47 9.00 5.76 2.61 1.37 79.95 

GRIZZLY ISLAND REFUGE 1971-1977 1.45 2.25 4.00 5.72 8.07 9.82 10.69 8.93 6.88 4.33 2.10 1.55 65.79 

HETCH HETCHY 1931-2005 0.00 0.00 0.00 3.84 5.31 7.34 8.78 7.86 5.85 3.23 1. 74 0.00 43.95 

INDIO FIRE STATION 1927-2005 2.85 4.38 7.15 9.98 12.73 14.85 14.95 13.59 10.80 7.60 3.98 2.49 105.35 

KETTLEMAN CITY 1 SSW 1955-2005 1.73 2.99 5.80 8.32 11.75 14.27 16.11 14.74 10.82 7.39 3.46 1.74 99.93 

KNIGHTS FERRY 2 ESE 1959-1977 1.00 1.69 3.14 5.65 8.54 10.14 11.60 10.31 7.74 4.62 2.69 1.90 68.12 

LAKE PILLSBURY 2 1964-1970 9.58 1.42 3.01 4.62 7.41 8.38 10.31 9.35 6.93 3.61 1.19 9.87 57.68 

LAKESHORE 2 1948-1972 1.09 1.68 2.97 4.78 6.15 7.43 9.71 8.79 6.44 3.40 1.41 0.95 54.80 

LAKE SOLANO 1975-2905 1.48 2.37 4.28 6.66 9.24 11.24 11.53 9.86 7.58 5.26 2.59 1.67 73.76 

LAKE SPAULDING 1914-2003 0.00 0.00 0.00 0.00 4.57 6.52 8.16 6.78 4.54 1.98 0.00 0.00 32.55 

LAKE SPAULDING DAM 1955-1971 0.90 0.09 0.09 0.00 7.20 9.98 12.38 11.85 8.94 6.64 9.00 0.90 56.99 

LITTLE PANOCHE DET DAM 1968-1975 1.77 2.89 5.87 9.39 14.56 16.31 18.45 16.63 12.46 7.60 3.04 1.78 110.75 

LODI 1948-2905 1.19 1.95 3.82 6.91 8.60 9.92 10.63 9.11 6.68 4.08 1.86 1.97 64.92 

LOS BANOS DET RESV 1968-2005 1.57 2.71 5.44 9.34 14.18 16.58 17.85 15.63 11.87 7.49 3.34 1.82 107.82 

MANDEVILLE ISLAND 1955-1965 1.10 2.38 4.77 6.95 8.55 10.44 11.22 9.71 7.41 5.12 2.47 1.13 71.25 

MANTECA 1965-1977 1.20 1.71 4.04 6.33 9.24 10.53 11.64 10.22 7.19 4.13 1. 78 1.16 69.17 

MARKLEY COVE 1970-2905 1.93 1.51 3.93 4.80 7.33 9.60 10.82 9.45 6.99 4.35 1. 75 1.91 61.67 

MOJAVE 1948-2005 0.00 4.65 6.45 9.97 13.59 15.33 17.21 16.00 11.83 8.28 4.76 3.52 111.59 

MONTICELLO DAM 1957-1979 1.92 1.83 3.24 4.96 7.35 9.36 11.20 19.07 7.56 4.82 1.98 1.98 64.47 

NACIMIENTO DAM 1957-1978 1.58 2.20 3.92 5.53 7.92 9.85 11.28 10.43 7.76 5.16 2.57 1.66 69.86 

NEWARK 1948-2005 1.71 2.15 4.16 5.76 7.77 8.64 9.94 8.00 6.64 4.52 2.36 1.55 62.39 

NEW MELONES DAM 1979-1992 1.34 2.25 3.56 5.93 9.16 11.85 13.73 12.29 8.86 5.75 2.37 1.28 78.37 

NEW MELONES DAM HQ 1992-2005 1.30 1.83 3.46 5.25 7.94 10.23 12.23 11.72 8.71 5.52 2.23 1.19 71.61 

OAKDALE WOODWARD DAM 1948-1967 1.93 1.72 3.42 5.47 8.95 11.88 14.23 12.22 8.53 5.52 2.19 1.92 76.99 

PLACERVILLE IFG 1955-1991 1.53 1.67 2.72 3.98 5.84 7.79 9.41 8.45 6.62 3.93 1.87 1.51 55.32 

RIVERSIDE CITRUS EXP ST 1948-290S 3.32 3.59 4.86 6.28 7.33 8.59 10.88 10.28 7.84 5.85 3.81 3.93 75.66 

SALT SPRINGS PWR HOUSE 1948-1998 1.84 2.47 3.27 4.86 6.49 7.92 10.30 9.95 7.89 5.18 2.68 2.26 65.11 

SAN LUIS DAM 1963-2905 1.41 2.49 5.31 8.67 13.14 15.75 18.38 16.68 12.01 7.42 3.02 1.56 195.84 

SHASTA DAM 1948-2905 1.50 2.08 3.17 5.05 7.28 9.18 11.36 10.36 7.55 4.85 2.29 1.63 66.39 

STOCKTON MOWRY BRIDGE 1955-1965 9.72 1.58 3.87 5.97 8.47 10.95 10.82 9.56 6.69 3.93 1. 79 9.74 64.91 

TAHOE 1914-2905 0.90 0.00 0.09 0.00 4.27 5.23 5.98 5.35 3.16 1.57 9.00 0.90 25.56 

TRACY PUMPING PLANT 1955-2905 1.53 2.47 5.39 8.29 12.01 14.88 16.92 14.55 10.64 6.57 2.93 1.48 97.48 

TRINITY DAM VISTA POINT 1959-1973 0.00 9.09 2.83 3.98 6.56 8.32 19.67 9.15 5.97 2.74 0.57 0.85 51.64 

TRINITY RIVER HATCHERY 1974-2905 0.58 1.09 2.77 4.43 6.78 8.32 9.71 8.91 6.15 3.20 9.99 0.51 53.35 

TULELAKE 1932-2005 0.00 9.09 0.00 4.56 7.55 8.39 9.52 8.53 6.80 3.49 0.00 0.00 48.84 

TURNTABLE CREEK 1948-1969 1.98 2.69 3.76 5.25 6.32 8.29 10.23 9.99 8.35 5.71 3.08 2.37 67.84 

TWITCHELL DAM 1962-2005 3.98 3.33 4.47 5.89 7.36 8.15 9.22 8.69 7.42 5.92 4.97 3.14 70.74 

WALNUT GROVE 1953-1961 1.53 2.90 4.74 5.73 7.76 10.94 10.22 8.81 6.49 3.60 2.10 1.32 65.15 

WARM SPRINGS DAM 1973-1998 1.17 1.83 3.23 5.37 7.83 9.33 19.94 8.49 6.58 4.59 2.10 1.17 61.73 

WHISKEYTOWN RESERVOIR 1960-2905 0.87 1.23 2.51 4.05 6.41 8.95 10.94 8.80 6.25 3.40 1.14 0.78 53.53 

WILLOW CREEK 1 NW 1968-2005 0.58 1.35 1.81 2.74 4.73 6.50 7.53 6.05 3.79 1.94 9.75 0.92 38.69 

COLORADO 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 
PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

AKRON 4 E 1918-200S 0.00 0.00 0.00 7.30 9.29 11.43 13.26 11.16 9.09 6.16 0.00 0.00 67.69 

ALAMOSA WSO AP 1948-200S 0.00 0.00 0.00 7.06 9.01 10.08 9.16 7.81 6.40 4.39 0.00 0.00 S3.91 

ARBOLES 19S7-1963 0.00 0.00 0.00 S.41 7.9S 9.S6 9.78 8.61 6.S2 0.00 0.00 0.00 47.83 

BONNY LAKE 1949-200S 0.00 0.00 0.00 7.26 8.69 10.86 11.78 10.61 8.12 6.12 4.S7 0.00 68.01 

CLIMAX 1949-200S 0.00 0.00 0.00 0.00 0.00 5.36 5.32 4.44 3.41 0.00 0.00 0.00 18.S3 

CONEJOS 3 NNW 1948-1960 0.00 0.00 0.00 6.30 7.14 7.67 7.41 6.87 7.19 S.74 0.00 0.00 48.32 

ESTES PARK 1948-1994 0.00 0.00 0.00 5.78 S.26 7.09 7.13 6.15 5.04 4.04 0.00 0.00 40.49 

FORT COLLINS 1900-2005 0.00 0.00 2.50 4.52 S.42 6.32 6.92 6.07 4.74 3.07 1.48 0.00 41.04 

GRAND JUNCTION WALKER 1900-2005 0.00 0.00 4.67 8.53 12.18 15.96 16.S3 14.02 10.98 7.05 2.42 0.00 92.34 

GRAND JUNCTION 6 ESE 1962-2005 0.00 0.00 0.00 6.60 9.29 11.77 12.01 10.24 7.48 4.65 2.09 0.00 64.13 

GRAND LAKE 6 SSW 1948-2005 0.00 0.00 0.00 0.00 4.82 7.75 7.81 6.79 5.24 3.10 0.00 0.00 35.S1 

GREEN MOUNTAIN DAM 1948-2005 0.00 0.00 0.00 0.00 4.96 6.S6 6.93 5.90 4.6S 2.90 0.00 0.00 31.90 

JOHN MARTIN DAM 1941-2005 0.00 0.00 6.40 8.04 9.67 11.30 12.31 10.28 7.82 S.61 2.78 0.00 74.21 

LAKE GEORGE 8 SW 1948-2005 0.00 0.00 0.00 0.00 S.1S 8.26 7.39 6.02 5.72 0.00 0.00 0.00 32.S4 

MEREDITH 1963-2005 0.00 0.00 0.00 0.00 7.69 8.26 8.34 6.96 5.2S 3.21 0.00 0.00 39.71 

MONTROSE 1 1948-1982 1.68 1.49 3.34 5.69 7.49 9.47 9.04 7.39 5.54 3.45 1.61 1.26 S7.4S 

PLATORO 1949-1991 0.00 0.00 0.00 0.00 S.86 8.10 6.S7 5.24 5.52 3.33 0.00 0.00 34.62 

PUEBLO WSO AP 1954-2005 0.00 0.00 0.00 8.71 9.50 11.S1 12.14 10.41 8.17 6.14 0.00 0.00 66.S8 

PUEBLO CITY RESERVOIR 1948-1971 0.00 5.13 5.86 6.85 8.81 10.09 10.60 8.85 7.43 S.30 2.99 2.71 74.62 

PUEBLO RESERVOIR 1975-2005 0.00 0.00 0.00 7.18 9.34 10.87 11.S8 9.92 7.90 S.88 0.00 0.00 62.67 

PUEBLO 6 SSW 1971-1985 0.00 0.00 4.82 7.47 8.57 10.65 11.30 9.40 7.13 S.53 0.00 0.00 64.87 

SAN LUIS LAKES 3W 1948-1955 0.00 0.00 4.50 6.07 8.51 9.88 8.49 7.77 6.57 4.53 0.00 0.00 S6.32 

SPRINGFIELD 7 WSW 1956-2002 0.00 0.00 0.00 7.85 9.73 11.44 12.69 11.28 8.53 6.29 4.57 0.00 72.38 

SUGARLOAF RESERVOIR 1948-2005 0.00 0.00 0.00 0.00 0.00 7.03 6.15 4.97 4.1S 2.93 0.00 0.00 25.23 

TRINIDAD LAKE 1989-2005 0.00 0.00 0.00 6.75 9.04 10.S5 9.88 8.27 7.6S 6.17 3.92 2.21 64.44 

TWIN LAKES RESERVOIR 1949-2005 0.00 0.00 0.00 0.00 6.93 8.65 7.92 6.79 5.33 3.96 0.00 0.00 39.S8 

VALLECITO DAM 1948-2005 0.00 0.00 1.91 3.82 S.29 6.22 6.09 5.31 4.39 3.04 1.60 0.00 37.67 

WAGON WHEEL GAP 3 N 1948-1972 0.00 0.00 0.00 0.00 6.69 7.90 7.15 5.81 5.30 2.61 0.00 0.00 35.46 

WALSH 1 W 1951-2005 0.00 0.00 0.00 0.00 10.78 12.35 12.76 11.63 9.42 6.88 0.00 0.00 63.82 

WIGGINS 7 SW 1960-1971 0.00 0.00 0.00 6.82 8.50 8.42 9.97 8.09 5.87 4.22 2.23 0.00 S4.12 

HAWAII 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

HILO WSO AP 87 1949-2005 5.06 4.87 5.1S 5.40 S.66 6.49 6.44 6.13 5.40 S.37 4.06 4.46 64.49 

HONOLULU OBSRVY 702.2 1962-2005 4.72 5.23 7.01 7.84 8.93 9.41 10.10 10.09 8.82 7.68 S.94 5.08 90.8S 

LIHUE WSO AP 1020.1 1950-2005 5.62 6.22 7.62 8.22 9.21 9.85 10.40 10.21 9.18 8.04 6.27 5.67 96.S1 

U S MAGNETIC OBSERVATOR 1949-1960 4.16 4.58 5.90 7.09 7.87 8.16 8.15 8.21 7.24 6.17 4.41 4.83 76.77 

PACIFIC ISLANDS 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP DCT NOV DEC YEAR 

GUAM NAS 1945-2005 6.98 0.00 0.00 7.96 7.20 6.S8 6.22 5.53 4.68 4.70 0.00 0.00 49.8S 

GUAM WSMO 1957-1998 5.84 6.07 7.38 7.82 7.73 6.92 6.02 5.28 5.1S S.36 S.42 5.74 74.73 

JOHNSTON ISLAND WSO AIR 1953-2004 8.69 8.76 10.29 10.25 10.79 11.42 11.S0 10.82 9.81 9.53 8.19 8.75 118.80 

MARCUS ISLAND WB 1953-1968 6.91 8.06 8.66 8.70 8.71 9.49 8.89 9.40 8.22 7.46 6.91 6.81 98.22 

PAGO PAGO WSO AIRPORT 1966-2005 7.96 6.17 6.84 5.95 S.94 6.66 6.69 6.62 7.36 8.08 7.13 9.12 84.S2 

WAKE ISLAND WSO AP 1953-2004 0.00 0.00 0.00 7.57 0.00 5.89 0.00 0.00 0.00 0.00 0.00 0.00 13.46 

YAP ISLAND WSO AIRPORT 1953-2005 6.31 6.20 7.37 7.40 6.97 5.S1 5.61 5.68 5.61 S.85 S.50 5.93 73.94 

IDAHO 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

ABERDEEN EXPERIMNT STN 1914-2005 0.00 0.00 0.00 0.00 7.46 8.95 10.28 9.40 6.41 3.85 0.00 0.00 46.3S 

ARRDWROCK DAM 1916-2005 0.00 0.00 0.00 0.00 S.94 7.S3 10.18 8.93 5.7S 2.35 0.00 0.00 40.68 

BLACKFOOT DAM 1948-1971 0.00 0.00 0.00 0.00 0.00 7.S6 9.19 7.42 3.97 0.00 0.00 0.00 28.14 

EMMETT 2 E 1948-2005 0.00 0.00 0.00 5.62 7.09 8.82 10.S8 9.44 6.56 4.57 0.00 0.00 S2.68 

ISLAND PARK 1937-2005 0.00 0.00 0.00 0.00 0.00 4.90 6.S8 5.69 0.00 0.00 0.00 0.00 17.17 
LIFTON PUMPING STN 1935-2005 0.00 0.00 0.00 4.08 5.97 7.41 8.70 7.80 5.35 3.02 0.00 0.00 42.33 

MACKAY 4 NW 1965-1988 0.00 0.00 0.00 0.00 6.81 8.39 10.23 8.73 6.39 0.00 0.00 0.00 40.55 

MINIDOKA DAM 1947-2005 0.00 0.00 0.00 6.79 8.17 10.76 13.01 11.48 8.26 4.63 2.94 0.00 66.04 

MOSCOW UNIV OF IDAHO 1893-2005 0.00 0.00 3.03 3.85 5.66 6.53 8.62 8.23 5.29 3.03 2.85 0.00 47.09 

PALISADES 1947-1993 0.00 0.00 0.00 4.01 5.56 7.04 9.38 8.32 5.48 3.58 0.00 0.00 43.37 

PARMA EXPERIMENT STN 1922-2005 0.00 0.00 0.00 6.00 8.26 9.05 10.41 9.47 6.30 0.00 0.00 0.00 49.49 

REXBURG RICKS COLLEGE 1977-2005 0.00 0.00 0.00 0.00 6.59 7.29 8.06 7.36 5.23 0.00 0.00 0.00 34.S3 

SANDPOINT EXPERMNT STN 1910-2005 0.00 0.00 0.00 0.00 4.96 5.51 7.47 6.78 4.47 0.00 0.00 0.00 29.19 

TWIN FALLS WSO 1963-2005 0.00 0.00 0.00 5.80 8.09 9.15 10.24 9.09 6.65 4.25 0.77 0.00 54.04 

MONTANA 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

SASS 6 NE 1948-2005 0.00 0.00 0.00 0.00 5.23 5.91 6.87 5.90 4.06 0.00 0.00 0.00 27.97 

BOZEMAN MONTANA ST UNIV 1892-2005 0.00 0.00 0.00 3.34 5.58 6.03 8.34 7.17 4.57 2.62 0.00 0.00 37.65 

BOZEMAN 6 W EXP FARM 1966-2005 0.00 0.00 0.00 4.24 5.68 6.62 8.19 7.73 4.88 2.99 0.00 0.00 40.33 

CANYON FERRY DAM 1948-1957 0.00 0.00 0.00 0.00 7.98 7.13 8.17 7.41 5.50 3.11 0.00 0.00 39.30 

CANYON FERRY DAM 1907-1996 0.00 0.00 0.00 3.15 5.04 6.21 7.91 7.04 4.18 1.93 0.00 0.00 35.46 

DILLON WMCE 1895-2005 0.00 0.00 0.00 3.05 4.72 5.32 6.41 5.45 3.48 2.84 0.00 0.00 31.27 

FORT ASSINNIBOINE 1917-2005 0.00 0.00 0.00 4.54 6.43 7.30 8.86 8.12 5.00 0.00 0.00 0.00 40.25 

FORT PECK 1948-1956 0.00 0.00 0.00 0.00 5.99 8.17 9.51 8.04 5.36 4.25 0.00 0.00 41.32 

FORT PECK POWER PLANT 1956-2005 0.00 0.00 0.00 0.00 7.34 8.45 10.42 9.81 5.83 3.53 0.00 0.00 45.38 

HUNGRY HORSE DAM 1948-2005 0.00 0.00 0.00 0.00 4.83 5.62 7.81 6.63 3.46 1.37 0.00 0.00 29.72 

HUNTLEY EXPERIMENT STN 1911-2005 0.00 0.00 0.00 5.03 6.71 7.40 8.88 8.15 5.10 0.00 0.00 0.00 41.27 

LONESOME LAKE 1948-1981 0.00 0.00 0.00 0.00 7.42 7.60 9.25 8.31 5.70 0.00 0.00 0.00 38.28 

MALTA 7 E 1972-2005 0.00 0.00 0.00 4.67 6.50 6.51 7.61 6.84 4.17 1.34 0.00 0.00 37.64 

MEDICINE LAKE 3 SE 1911-2005 0.00 0.00 0.00 0.00 7.44 7.69 9.62 9.19 5.36 0.00 0.00 0.00 39.30 

MOCCASIN EXPERIMENT STN 1909-2005 0.00 0.00 0.00 4.35 6.59 7.72 9.66 9.21 6.39 0.00 0.00 0.00 43.92 

SIDNEY 1910-2005 0.00 0.00 0.00 3.99 5.63 6.44 6.93 5.45 2.89 1.81 0.00 0.00 33.14 

TIBER DAM 1952-2005 0.00 0.00 0.00 0.00 4.51 6.46 7.65 5.56 4.34 0.00 0.00 0.00 28.52 

VALIER 1911-2005 0.00 0.00 0.00 0.00 5.37 6.49 7.33 5.62 4.72 0.00 0.00 0.00 29.53 

WESTERN AG RESEARCH CNT 1965-2005 0.00 0.00 0.00 0.00 5.08 6.03 7.26 6.07 4.14 2.25 0.00 0.00 30.83 

YELLOWTAIL DAM 1948-2005 0.00 0.00 0.00 0.00 6.94 8.84 10.60 9.74 6.58 4.86 0.00 0.00 47.S6 

NEVADA 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

BEOWAWE U OF N RANCH 1972-2005 0.00 0.00 0.00 3.98 7.17 8.68 10.42 9.52 6.97 4.43 0.00 0.00 51.17 

BOULDER CITY 1931-2004 3.71 4.68 7.56 10.67 13.79 16.57 16.45 14.41 11.51 8.11 4.87 3.69 116.02 

CALIENTE 1928-2005 0.00 0.00 3.97 6.82 8.57 10.58 11.13 9.41 6.89 4.35 1.91 0.00 63.63 

CENTRAL NEVADA FIELD LA 1965-1986 0.00 0.00 2.98 5.95 8.69 10.49 12.24 11.31 8.08 4.88 1. 73 0.00 66.35 

FALLON EXPERIMENT STN 1950-1992 1.34 2.23 4.39 6.15 7.70 8.91 9.87 8.63 6.10 3.90 1.91 1.37 62.50 

LAHONTAN 1948-2005 0.00 0.00 0.00 7.18 9.64 11.58 13.75 12.23 7.83 4.51 2.09 0.00 68.81 

LOGANDALE 1968-1992 2.55 3.61 5.26 8.96 12.44 14.20 14.38 12.07 8.67 7.66 3.86 2.89 96.55 

RUBY LAKE 1948-2005 0.00 0.00 0.00 5.10 7.09 8.90 10.54 9.37 6.51 3.95 0.00 0.00 51.46 

RYE PATCH DAM 1948-2005 0.00 0.00 3.71 5.83 7.38 9.23 11.15 10.06 6.95 4.30 0.77 0.00 59.38 

SILVERPEAK 1967-2005 0.00 3.84 7.26 10.13 13.60 16.31 17.98 15.92 11.32 6.88 2.94 0.00 106.18 

TOPAZ LAKE 1957-2005 0.00 0.00 0.00 7.15 9.11 10.94 12.68 11.56 8.80 5.95 2.79 0.00 68.98 

NEW MEXICO 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

ABIQUIU DAM 1957-2005 0.00 0.00 6.06 7.43 9.95 11.39 10.52 8.90 7.23 5.30 3.13 2.22 72.13 

AGRICULTURAL COLLEGE 1892-1959 3.01 4.00 7.89 10.20 8.65 13.99 12.33 11.16 8.31 6.28 4.35 2.89 93.06 

ALAMOGORDO DAM 1939-1975 3.73 4.35 8.21 11.30 12.88 14.43 13.66 11.59 9.17 7.19 4.89 3.46 104.86 

ANIMAS 1923-2005 3.87 4.91 8.29 10.78 12.36 14.25 11.60 11.07 8.54 6.71 4.69 3.61 100.68 

ARTESIA 6 S 1914-2005 4.38 3.03 7.25 7.66 12.11 13.13 10.86 10.44 9.36 6.34 3.12 0.00 87.68 

BITTER LAKES WL REFUGE 1950-2005 2.67 3.93 6.82 9.60 11.31 12.62 11.88 10.16 8.02 5.85 3.53 2.50 88.89 

BOSQUE DEL APACHE 1914-2005 3.21 4.20 7.76 10.20 11.61 13.13 11.56 10.36 8.03 6.25 3.66 2.54 92.51 

BRANTLEY DAM 1987-2005 4.65 0.00 8.62 11.77 14.61 15.46 14.19 12.22 9.88 7.97 5.77 4.34 109.48 

CABALLO DAM 1938-2005 4.42 5.10 8.56 11.37 13.59 14.80 13.08 11.35 9.26 7.27 4.78 3.48 107.06 

CAPULIN NATL MONUMENT 1966-1979 0.00 0.00 0.00 0.00 9.08 10.57 9.71 9.18 7.6S 0.00 0.00 0.00 46.19 
CLOVIS 13 N 1929-2005 3.83 4.12 6.63 8.72 10.15 11.45 11.65 9.55 7.64 5.78 3.95 3.21 86.68 

COCHITI DAM 1975-2005 0.00 4.14 6.44 8.48 11.07 12.95 12.38 10.62 8.91 6.29 3.94 2.79 88.01 

CONCHAS DAM 1938-2005 0.00 0.00 7.35 8.88 10.29 11.69 11.37 10.06 8.24 6.18 4.04 2.79 80.89 

EAGLE NEST 1937-2005 0.00 0.00 0.00 4.91 7.67 7.83 7.07 5.87 5.30 4.31 0.00 0.00 42.96 

EL VADO DAM 1923-2005 0.00 0.00 3.61 5.43 7.46 8.84 8.52 6.91 5.66 3.84 1.72 0.00 51.99 

ELEPHANT SUITE DAM 1917-2005 3.47 4.87 8.61 12.22 14.94 16.37 14.15 12.05 9.78 7.70 4.91 3.34 112.41 

ESTANCIA 1914-2005 0.00 0.00 3.26 6.79 8.56 9.27 8.61 7.10 5.60 3.82 2.62 0.00 55.63 

FARMINGTON AG SCIENCE c 1978-2005 0.00 0.00 0.00 7.97 10.06 12.00 12.52 10.70 8.15 5.41 0.00 0.00 66.81 

FLORIDA 1939-1992 3.54 4.81 8.10 10.94 13.03 14.80 11.84 10.10 8.51 6.58 4.57 3.11 99.93 

GALLUP RANGER STN 1966-1975 0.00 0.00 0.00 6.61 9.31 12.12 10.50 8.70 7.95 5.07 2.20 0.00 62.46 

JEMEZ DAM 1953-2005 0.00 0.00 0.00 9.91 12.27 13.95 14.29 11.45 9.80 6.72 3.65 0.00 82.04 

JORNADA EXP RANGE 1925-2005 2.50 4.18 7.24 10.06 11.94 12.85 10.88 9.53 7.82 5.71 3.61 2.50 88.82 

LAGUNA 1914-2005 0.00 0.00 0.00 8.47 9.33 11.98 10.76 8.88 6.83 5.00 1.98 0.00 63.23 

LAKE AVALON 1914-1979 4.49 5.33 9.42 12.36 14.31 15.16 14.14 12.33 9.25 7.26 4.68 4.20 112.93 

LAKE MC MILLAN 1941-1949 0.00 0.00 0.00 13.78 8.14 14.26 13.38 13.45 19.35 6.15 0.00 0.00 79.51 

LOS LUNAS 3 SSW 1923-2005 1.87 2.81 5.27 7.77 9.74 10.49 10.06 8.67 6.58 4.64 2.75 2.45 73.10 

NARROWS 1948-1964 3.09 5.67 7.62 11.07 13.37 15.44 13.07 11.42 9.97 7.29 4.32 2.64 104.88 

NAVAJO DAM 1963-2005 0.00 0.00 0.00 6.58 9.10 11.07 11.24 9.66 7.22 4.74 0.00 0.00 59.61 

PORTALES 7 WNW 1934-1969 3.26 4.57 8.24 8.85 10.72 12.16 10.44 9.28 7.95 5.98 4.15 3.53 89.13 

HOOD RANGER STN 1954-2005 0.00 0.00 0.00 7.84 9.02 10.81 8.25 6.87 6.12 5.14 2.65 0.00 56.70 

ROSWELL WSO AIRPORT 1893-1972 0.00 0.00 0.00 11.29 0.00 15.87 12.11 12.63 7.92 6.97 4.66 4.51 75.96 

SANTA FE 1867-1972 0.00 0.00 3.00 7.28 8.73 10.93 9.95 8.26 7.15 5.10 2.50 0.00 62.90 

SANTA FE 2 1972-2005 0.00 0.00 0.00 7.19 9.76 11.31 10.36 9.29 7.41 5.08 0.00 0.00 60.22 

SHIPROCK 1926-2005 0.00 0.00 0.00 7.84 10.57 14.44 13.17 10.80 9.80 6.54 0.00 0.00 73.16 

SOCORRO 1914-2095 0.00 0.00 4.83 7.09 9.17 9.35 8.56 7.57 5.73 4.14 0.00 0.00 56.44 

STATE UNIVERSITY 1959-2005 3.00 4.33 7.40 9.99 12.93 12.91 12.05 10.34 8.14 6.17 3.85 2.79 92.91 

SUMNER LAKE 1921-2005 0.00 0.00 7.33 19.22 12.35 13.54 13.36 11.16 9.02 6.97 4.92 3.17 92.04 

TUCUMCARI 4 NE 1904-2005 0.00 0.00 0.00 9.83 11.53 13.11 13.00 11.13 8.96 6.74 0.00 0.00 74.30 

UTE DAM 1965-2005 4.38 4.91 7.53 8.78 10.75 10.49 10.92 9.42 7.56 6.68 4.98 3.04 89.44 

OREGON 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG 5EP OCT NOV DEC YEAR 

ASTOR EXPERIMENT STN 1948-1973 0.56 0.96 1.47 2.21 3.75 3.95 4.65 4.19 2.95 1.65 0.87 0.70 27.82 

BEND 7 NE 1991-2005 0.00 0.00 0.00 4.25 6.14 6.69 8.66 7.91 5.42 0.00 0.00 0.00 39.07 

CORVALLIS STATE UNIV 1889-2005 0.00 0.00 1.79 2.96 4.59 5.86 7.70 7.07 5.06 2.33 0.96 0.00 38.32 

COTTAGE GROVE DAM 1943-2005 0.00 1.27 2.16 3.07 4.56 5.60 7.75 6.79 4.47 2.06 0.82 0.00 38.46 

DETROIT DAM 1954-2005 0.19 1.16 1.69 2.51 4.38 5.90 7.68 6.64 4.24 2.05 0.88 0.46 37.78 

DORENA DAM 1948-2005 0.00 1.01 1.94 2.95 4.98 6.11 8.19 7.15 4.66 2.01 0.00 0.00 39.00 

FERN RIDGE DAM 1943-2005 0.39 0.79 1.92 3.17 5.03 6.21 8.12 7.09 4.76 2.21 0.67 0.34 40.70 

HERMISTON 2 S 1928-1997 0.00 0.00 3.44 5.43 7.91 9.67 11.32 9.66 6.32 3.97 0.00 0.00 57.72 

HOOD RIVER EXP STN 1928-2005 0.00 0.00 0.00 0.00 6.45 6.80 8.81 7.04 3.32 3.09 0.00 0.00 35.51 

KLAMATH FALLS AGR STN 1949-2004 0.70 1.31 2.81 4.73 7.21 8.79 10.24 9.41 6.30 4.37 0.00 0.67 56.54 

LOOKOUT POINT DAM 1955-2005 0.00 1.76 2.29 3.19 4.67 5.77 7.69 6.89 4.45 1.96 1.91 0.00 39.59 

MADRAS 1 NNW 1952-2005 0.00 0.00 0.00 4.72 7.12 8.66 10.23 9.17 6.21 3.16 1. 70 0.00 50.97 

MALHEUR BRANCH EXP STN 1943-2005 0.00 0.00 0.00 5.68 7.71 8.94 11.06 9.57 6.17 3.14 0.72 0.00 52.99 

VOLTAGE 2 NW 1959-2005 0.00 0.00 0.00 4.37 6.22 7.67 9.58 8.52 5.86 3.19 0.00 0.00 45.41 

MEDFORD EXP STN 1937-2003 0.53 1.02 2.26 3.56 5.29 6.54 8.24 6.78 4.05 1.81 0.76 0.44 41.28 

MORO 1928-2005 0.00 0.09 2.96 5.11 7.74 9.60 12.34 11.18 7.15 3.56 0.00 0.00 59.64 

N WILLAMETTE EXP STN 1963-2005 0.63 1.18 2.29 3.31 5.15 6.01 7.40 6.78 4.68 2.39 1.95 0.57 41.44 

ODELL LAKE LAND PAN 1948-1989 0.00 0.09 0.00 0.00 3.17 4.13 5.54 3.81 1.90 0.67 0.00 0.00 19.22 

ODELL LAKE WATER PAN 1945-1959 0.00 0.00 0.00 0.00 1.87 2.71 3.97 4.01 3.44 2.02 0.00 0.00 18.02 

PELTON DAM 1958-2005 0.00 0.09 0.00 4.48 6.77 8.26 9.98 8.12 5.22 2.49 0.00 0.00 45.32 

PENDLETON BR EXP STN 1956-2005 0.00 0.00 3.41 5.09 6.93 8.81 11.78 10.85 7.02 3.89 0.00 0.00 57.69 

SUMMER LAKE 1 S 1957-2005 0.00 0.09 0.00 5.19 7.28 8.71 10.88 9.79 6.48 3.48 1.90 0.00 53.71 

UNION EXP STN 1928-2005 0.00 0.00 0.00 3.16 4.80 6.03 7.49 6.89 4.32 2.74 0.00 0.00 35.34 

WARM SPRINGS RESERVOIR 1931-1974 0.00 0.09 0.00 4.85 7.21 8.66 11.73 10.19 6.77 3.49 0.00 0.00 52.90 

WICKIUP DAM 1941-2005 0.00 0.09 0.00 2.99 5.14 6.46 7.99 6.84 4.68 2.46 0.00 0.00 36.56 

WINCHESTER 1959-2005 0.00 0.09 0.00 2.25 3.79 5.51 6.93 6.38 4.51 1.33 0.00 0.00 30.70 

WINCHESTER 3 W F STN 1981-1989 0.91 0.96 2.06 3.62 5.94 6.62 8.48 8.19 4.94 2.46 1.17 0.87 45.32 

UTAH 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG 5EP OCT NOV DEC YEAR 

ARCHES NATL PARK HQ 1989-2005 0.00 0.00 0.00 7.44 9.81 12.33 12.94 11.15 8.16 4.73 0.00 0.00 66.56 

BEAR RIVER BAY 1969-1996 0.00 0.00 0.00 6.27 10.17 12.59 13.86 12.29 7.83 4.89 0.00 0.00 67.90 

BEAR RIVER REFUGE 1948-1984 0.00 0.09 0.00 4.89 7.21 8.66 10.46 9.39 6.13 3.27 1.27 0.00 51.10 
BRYCE CANYON NAT'L PRK 1971-1978 0.00 0.00 0.00 0.00 6.86 7.86 8.07 7.21 5.30 0.00 0.00 0.00 35.30 

FARMINGTON USU FLD STN 1948-2005 0.00 0.00 0.00 0.00 7.33 6.35 9.25 8.62 4.63 2.97 0.00 0.00 39.15 

FERRON 1948-2005 0.00 0.00 0.00 5.20 5.66 8.06 6.58 6.39 5.49 3.53 0.00 0.00 40.91 

FISH SPRINGS REFUGE 1960-2005 0.00 0.00 0.00 7.02 10.70 12.90 15.92 13.58 9.92 5.84 0.00 0.00 75.88 

FLAMING GORGE 1957-2005 0.00 0.00 0.00 0.00 6.23 8.74 9.71 8.62 5.76 3.94 0.00 0.00 43.00 

FORT DUCHESNE 1894-2005 0.00 0.00 0.00 5.16 7.41 8.61 9.06 7.98 5.57 3.25 0.00 0.00 47.04 

GREEN RIVER AVIATION 1893-2005 0.00 0.00 0.00 6.07 8.07 9.29 9.49 7.97 5.74 3.52 1.60 0.00 51.75 

GUNNISON 1956-1990 0.00 0.00 0.00 5.10 7.23 8.70 9.65 8.26 6.03 3.81 0.00 0.00 48.78 

HITE 1949-1962 0.00 0.00 0.00 7.84 11.74 14.14 14.01 12.44 8.34 4.86 1.94 0.00 75.31 

LOGAN USU EXP STN 1950-1978 0.00 0.00 0.00 4.01 5.98 7.05 8.37 7.50 5.02 2.92 0.00 0.00 40.85 

LOGAN 5 SW EXP FARM 1969-2005 0.00 0.00 3.30 4.57 6.57 8.48 10.05 8.93 5.88 3.51 0.00 0.00 51.29 

MANILA 1952-2005 0.00 0.00 0.00 0.00 7.31 8.66 9.83 8.37 6.50 4.63 0.00 0.00 45.30 

MEXICAN HAT 1948-2005 0.00 0.00 6.31 8.45 11.99 14.42 14.87 12.48 9.37 5.52 2.25 0.00 85.66 

MILFORD 1906-2005 0.00 0.00 0.00 7.47 10.22 13.54 15.47 13.24 9.88 6.16 2.32 0.00 78.30 

MOAB 1889-2005 0.00 0.00 4.19 7.29 10.41 12.03 12.72 10.75 7.66 4.25 2.26 0.00 71.56 

MORGAN 1948-2005 0.00 0.00 0.00 4.94 6.96 7.30 9.07 8.01 6.15 3.74 0.00 0.00 46.17 

PIUTE DAM 1948-1971 0.00 0.00 0.00 0.00 7.91 9.98 10.13 8.40 6.98 4.60 0.00 0.00 48.00 

PROVO AIRPORT 1948-1953 0.00 0.00 2.91 6.03 6.83 8.62 8.88 8.36 6.09 3.41 0.00 0.00 51.13 

PROVO BYU 1980-2005 0.00 0.00 2.59 4.71 6.81 8.77 9.85 8.70 5.59 2.92 0.00 0.00 49.94 

PROVO RADIO KAYK 1952-1977 0.00 0.00 0.00 4.38 5.94 7.53 8.32 7.58 5.40 3.21 1.53 0.00 43.89 

ST GEORGE 1862-2005 0.00 0.00 4.57 7.36 10.08 12.22 13.17 11.55 8.22 4.83 2.68 0.00 74.68 

SALTAIR SALT PLANT 1956-1991 0.00 0.00 3.66 6.20 9.19 11.88 14.40 12.67 8.58 4.86 2.32 0.00 73.76 

SCOFIELD DAM 1948-1991 0.00 0.00 0.00 0.00 5.52 7.84 8.29 6.94 5.13 3.90 0.00 0.00 37.62 

SEVIER DRY LAKE 1987-1993 0.00 0.00 2.93 6.33 13.52 16.06 18.32 0.00 0.ee 0.00 0.00 0.00 57.16 

STRAWBERRY RESERVOIR EA 1956-1977 0.00 0.00 0.00 0.00 5.82 7.28 7.87 7.31 5.08 3.02 0.00 0.00 36.38 

UTAH LAKE LEHI 1928-2003 0.00 0.00 2.77 5.19 7.11 8.80 9.61 8.58 6.10 3.81 1.42 0.00 53.39 

VERNAL ARPT 1928-2005 0.00 0.00 0.00 5.07 6.41 7.48 6.64 6.34 4.89 2.92 0.00 0.00 39.75 

WANSHIP DAM 1955-2005 0.00 0.00 0.00 0.00 6.09 6.79 7.41 6.59 4.79 3.19 0.00 0.00 34.86 

WASHINGTON 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

BELLINGHAM 2 N 1948-1985 0.00 0.00 0.00 2.75 4.59 5.35 6.28 5.56 3.34 1.22 0.00 0.00 29.09 

BELLINGHAM 3 SSW 1985-2005 0.00 0.00 0.00 0.00 3.77 4.69 5.31 4.59 2.65 1.39 0.00 0.00 22.31 

BUMPING LAKE 1931-1967 0.00 0.00 0.00 0.00 4.01 4.13 5.58 4.63 3.19 2.34 0.00 0.00 23.88 

CONNELL 1 W 1969-2003 0.00 0.00 0.00 5.43 8.35 9.89 11.90 10.77 6.88 3.09 0.00 0.00 56.22 

ELTOPIA 6 W 1954-1973 0.00 0.00 3.23 5.46 6.61 7.73 9.36 7.56 4.93 2.45 0.83 0.00 48.16 

ELTOPIA 8 WSW 1974-2005 0.00 0.00 0.00 4.44 6.10 7.05 8.07 7.04 4.44 2.06 0.62 0.00 39.82 

LAKE KACHESS 1931-1977 0.00 0.00 0.00 2.37 3.78 4.82 6.12 5.12 3.20 0.00 0.00 0.00 25.41 

LIND 3 NE EXP STN 1931-2005 0.00 0.00 0.00 5.35 8.92 9.40 12.02 10.44 6.87 2.59 0.00 0.00 54.69 

MOSES LAKE 3 E 1943-1979 0.00 0.00 0.00 5.51 7.50 8.78 10.29 8.10 5.53 2.79 0.00 0.00 48.50 

OROVILLE 1 S 1969-1979 0.00 0.00 0.00 4.49 5.82 6.36 7.42 6.22 4.28 1.99 0.00 0.00 36.58 

OTHELLO 6 ESE 1941-2002 0.00 0.00 0.00 5.40 7.60 9.00 10.77 9.14 6.12 2.92 0.00 0.00 50.95 

PROSSER 4 NE 1931-2005 0.00 0.00 2.49 4.86 6.57 7.50 8.61 7.09 4.73 2.48 0.80 0.69 45.82 

PUYALLUP 2 W EXP STN 1931-1995 0.00 0.71 1.58 2.46 3.97 4.63 5.61 4.97 2.92 1.28 0.61 0.00 28.74 

QUINCY 1 S 1941-2005 0.00 0.00 0.00 5.76 8.05 9.00 10.20 8.52 5.52 2.60 0.00 0.00 49.65 

RIMROCK TIETON DAM 1947-1977 0.00 0.00 0.00 0.00 5.35 7.08 15.41 6.71 3.70 1.63 0.00 0.00 39.88 

SEATTLE MAPLE LEAF R 1941-1960 0.61 0.82 1.80 3.26 4.64 5.12 6.70 5.19 3.49 1.62 0.74 0.53 34.52 

SPOKANE WSO AIRPORT 1889-2005 0.00 0.00 0.00 4.66 7.27 8.57 11.28 10.22 6.41 0.00 0.00 0.00 48.41 

WALLA WALLA 3 W ENT LA 1931-1962 0.00 0.00 0.00 4.79 6.26 7.61 9.72 7.95 4.78 2.58 0.00 0.00 43.69 

WENATCHEE EXP STN 1959-1997 0.00 0.00 0.00 4.74 6.87 7.87 9.38 7.83 4.19 0.00 0.00 0.00 40.88 

WHITMAN MISSION 1962-2005 0.00 0.00 0.00 4.58 6.58 8.17 10.34 9.08 5.52 2.84 0.00 0.00 47.11 

WIND RIVER 1901-1977 0.00 0.00 0.00 2.91 4.19 4.64 6.15 4.97 3.31 1.62 0.00 0.00 27.79 

YAKIMA WSO AP 1946-2005 0.00 0.00 0.00 5.27 7.62 8.71 10.42 9.29 5.90 0.00 0.00 0.00 47.21 

WYOMING 

MONTHLY AVERAGE PAN EVAPORATION (INCHES) 

PERIOD 

OF RECORD JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR 

ANCHOR DAM 1961-1979 0.00 0.00 0.00 0.00 6.46 7.57 9.66 8.31 5.95 5.33 0.00 0.00 43.28 

ARCHER 1948-2005 0.00 0.00 0.00 3.66 5.71 7.08 8.30 7.94 5.94 4.45 0.00 0.00 43.08 

BOYSEN DAM 1948-2005 0.00 0.00 0.00 5.44 6.72 8.24 9.86 9.08 5.92 3.20 0.00 0.00 48.46 

FARSON 1915-2005 0.00 0.00 0.00 0.00 7.45 9.37 10.67 8.94 6.53 3.89 0.00 0.00 46.76 

GILLETTE 9 ESE 1925-2005 0.00 0.00 0.00 4.52 6.40 7.50 9.88 9.44 6.18 4.36 2.39 0.00 50.67 

GREEN RIVER 1915-2005 0.00 0.00 0.00 0.00 8.22 9.71 11.08 9.89 6.82 4.62 0.00 0.00 50.25 

HEART MOUNTAIN 1949-2005 0.00 0.00 0.00 3.50 5.82 6.37 7.35 6.67 4.37 3.43 0.00 0.00 37.51 

KEYHOLE DAM 1949-1958 0.00 0.00 0.00 4.99 6.96 7.25 9.56 9.91 6.04 3.68 0.00 0.00 46.59 

LARAMIE 2 NW 1966-2005 0.00 0.00 0.00 0.00 8.21 10.26 10.71 9.58 7.48 4.76 0.00 0.00 51.00 
LOOKOUT 14 NE 1948-1965 0.00 0.00 0.00 0.00 7.50 11.32 10.89 10.40 7.76 7.30 0.00 0.00 55.17 

MORTON 1 NW 1949-1968 0.00 0.00 0.00 3.91 5.59 6.73 8.27 7.31 4.96 3.35 0.00 0.00 40.12 

PATHFINDER DAM 1948-1991 0.00 0.00 3.20 5.07 6.78 8.78 10.53 9.75 7.17 4.95 2.81 0.00 59.04 

SEMINOE DAM 1948-2005 0.00 0.00 0.00 0.00 5.24 8.27 8.99 8.12 5.59 0.00 0.00 0.00 36.21 

SHERIDAN FIELD STN 1920-2005 0.00 0.00 0.00 3.55 6.29 7.88 10.21 9.73 6.48 0.00 0.00 0.00 44.14 

WHALEN DAM 1949-1991 0.00 0.00 3.32 5.17 7.44 9.00 10.39 9.09 6.24 4.18 0.00 0.00 54.83