CLIMATE OF LAS VEGAS, NEVADA

ANDREW GORELOW / CHRIS STACHELSKI

UPDATED OCTOBER 2012

PAUL H. SKRBAC 

PREVIOUS EDITION DECEMBER 1999
TABLE OF CONTENTS

ABSTRACT AND NARRATIVE SUMMARY..........................1-2

 

MONTHLY NORMALS...........................................3

MONTHLY EXTREMES (RECORDS)................................4 

MONTHLY TEMPERATURE EXTREMES/DAILY NORMALS

JANUARY ................................................5

FEBRUARY ................................................6

MARCH ................................................7

APRIL ................................................8

MAY ................................................9

JUNE ................................................10

JULY ................................................11

AUGUST ................................................12

SEPTEMBER ................................................13

OCTOBER ................................................14

NOVEMBER ................................................15

DECEMBER ................................................16

PRECIPITATION DATA

10 WETTEST AND DRIEST YEARS AND OVERALL MONTHS............17

10 WETTEST AND DRIEST MONTHS BY MONTH..................18-20

MEASURABLE PRECIPITATION DAYS AND EXTREMES................21

CONSECUTIVE WET AND DRY DAYS..............................22

24 HOUR PRECIPITATION RECORDS.............................23

TEMPERATURE DATA

10 COLDEST AND HOTTEST YEARS AND OVERALL MONTHS...........24

10 COLDEST AND HOTTEST MONTHS BY MONTH.................25-27

DESERT HEAT STATISTICS.................................28-30

FROST/FREEZE DATA.........................................31

THUNDERSTORMS/HAIL

THUNDERSTORMS.............................................32

DEW POINT RECORDS.........................................32

HAIL......................................................33

 

WIND

WIND NORMALS AND EXTREMES.................................34

10 WINDIEST MONTHS BY MONTH............................35-36
MISCELLANEOUS DATA

HEATING/COOLING DEGREE DAYS...............................37

SNOW......................................................38

SUNSHINE...............................................39-40

CLOUDIEST MONTHS AND YEARS................................41

RELATIVE HUMIDITY.........................................42

FOG.......................................................43

PRESSURE..................................................44

HOLIDAY WEATHER........................................45-46

ACKNOWLEDGMENTS...........................................47

FIGURES

Figure 1. Record Maximum and Minimum Monthly Temperatures 

Figure 2. Annual Precipitation (in inches), 1937-2010

Figure 3. Average Relative Humidity at 4 A.M. and 4 P.M. PST

Figure 4. Average Number of Thunderstorm Days, by Month

Figure 5. Average Number of Days Exceeding 90F/100F/110F, by Month

Figure 6. Monthly Precipitation Extremes 

Figure 7. Peak Wind Gusts per Month

Figure 8. Average Yearly Temperature by Decade

Figure 9. Population of Clark County, Nevada

Figure 10. Minimum Temperature by Decade

Figure 11. Maximum Temperature by Decade

Figure 12. Normal Monthly Precipitation
1

CLIMATE OF LAS VEGAS, NEVADA

ABSTRACT

During the last two decades, the Las Vegas Valley has emerged as 

one of the fastest growing metropolitan areas in the nation. The 

population has expanded from about 400,000 in 1980 to 1.8 million 

people in 2005. In addition, Las Vegas attracts more visitors 

annually than any other American city except Orlando, Florida. As 

a result, local forecasters continually field inquiries regarding 

the area's climate from a broad base of public interests. Official 

weather observations have been recorded in Las Vegas since 1937, 

initially at Nellis Field in the northeast portion of the valley, 

then later at McCarran Field on the south end. This paper is a

revision of the 1999 edition and includes updated climate 

information through 2004. This paper is used as a reference for 

National Weather Service personnel to aid in responding to climate 

inquiries and is also intended to be a resource for the local 

media. 

NARRATIVE SUMMARY

I. Topography and History

Las Vegas is located in a broad desert valley in extreme southern 

Nevada. Mountains surrounding the valley extend 2,000 to 10,000 

feet above the valley floor. The Las Vegas Valley comprises about 

600 square miles and runs from northwest to southeast. The valley 

is bounded on the north by the Sheep Range, while Boulder City and 

the Lake Mead National Recreation Area are generally considered its 

southern extent. To the west are the Spring Mountains, which 

include Mt. Charleston, the region's highest peak at 11,918 feet. 

Several smaller ranges line the eastern rim of the valley, 

including the Muddy Mountains, the Black Mountains and the Eldorado 

Range. 

Official weather observations began in 1937 at what is now Nellis 

Air Force Base. In late 1948, the U.S. Weather Bureau moved to 

McCarran Field, now McCarran International Airport. McCarran is 

located 7 miles south of downtown Las Vegas. For most of the Las 

Vegas metropolitan area, the valley floor slopes downward from west 

to east. This affects the local climatology significantly in terms 

of driving variations in wind, precipitation, and storm runoff. 
2

II. General Climatic Summary

The four seasons are actually well defined in Las Vegas, although 

they differ from the traditional view of seasonal variation. 

Summers display classic desert southwest characteristics. Daily 

high temperatures typically exceed 100 degrees with lows in the 

70s. The summer heat is tempered somewhat by the extremely low 

relative humidities. However, it is not uncommon for humidity to 

increase markedly for several weeks each summer in association with

a moist "monsoonal flow" from the south, typically during July and 

August. Aside from increasing the discomfort level, these moist 

winds also support the development of spectacular desert 

thunderstorms which are frequently associated with significant 

flash flooding and/or strong downburst winds. On average, sunny 

days are recorded 85 percent of the time and there are over 300 

days per year with no measurable rainfall.

Winters on the whole, are mild and pleasant. Afternoon 

temperatures average near 60 degrees and skies are mostly clear. 

Pacific storms occasionally produce rainfall in Las Vegas, but in 

general, the Sierra Nevada Mountains of eastern California and the 

Spring Mountains immediately west of the Las Vegas Valley act as 

effective barriers to moisture.

Snow accumulation is rare in Las Vegas. Flurries are observed once 

or twice during most winters, but snowfall of an inch or more 

occurs only once every four to five years. Freezing temperatures 

do occur with some regularity each year with a 30 year average of 

24 days with low temperatures at or below 32 degrees. Snowfall is 

rather common in the mountains surrounding Las Vegas with the 

Spring Mountains receiving between 5 and 10 feet annually.

The spring and fall seasons are generally considered ideal. 

Although rather sharp temperature changes can occur during these 

months, outdoor activities are seldom hampered. 

 

Strong winds are arguably the most persistent and provoking weather 

hazard experienced in the area. Winds over 50 mph are infrequent 

but can occur with some of the more vigorous storms. Winter and 

spring wind events often generate widespread areas of blowing dust 

and sand. Strong wind episodes in the summertime are usually 

connected with thunderstorms, and are thus more isolated and 

localized. Prevailing wind direction is typically either southwest 

or north, unless associated with a thunderstorm outflow.
3

MONTHLY NORMALS

 

LAS VEGAS NEVADA

 

PERIOD OF RECORD: 1981-2010

 

 SEASON TOTAL

 MAX MIN AVG HDD CDD PCPN HDD CDD 

JAN 58.0 39.4 48.7 505 0 0.54 1352 0

FEB 62.5 43.4 52.9 339 1 0.76 1691 1

MAR 70.3 49.4 59.9 189 30 0.44 1880 31

APR 78.3 56.1 67.2 63 129 0.15 1943 160

MAY 88.9 65.8 77.3 7 390 0.12 1950 550

JUN 98.7 74.6 86.7 1 650 0.07 1951 1200

JUL 104.2 80.9 92.5 0 854 0.40 0 2054

AUG 102.0 79.3 90.6 0 795 0.33 0 2849

SEP 94.0 71.1 82.6 1 528 0.25 1 3377

OCT 80.6 58.5 69.5 38 179 0.27 39 3556

NOV 66.3 46.5 56.4 270 12 0.36 309 3568

DEC 56.6 38.7 47.7 538 0 0.50 847 3568

ANNUAL 80.1 58.7 69.4 1951 3568 4.19

ALL NORMALS LISTED, UNLESS OTHERWISE NOTED, ARE FROM THE NATIONAL CLIMATIC DATA 

CENTER (NCDC).

ALL UNITS OF MEASUREMENT IN THIS DOCUMENT ARE DEFINED AS FOLLOWS:

TEMPERATURES ARE IN DEGREES FAHRENHEIT

PRECIPITATION IS IN INCHES

EXTREMES AND RECORDS ARE CONSIDERED THE SAME THING

HEATING AND COOLING DEGREE DAYS ARE BASED ON A 65 DEGREE STANDARD

(eg a mean temp for the day of 75 would equate to 10 cooling degree days

or a mean temp of 50 degrees would equate to 15 heating degree days)

THE HEATING DEGREE DAY SEASON EXTENDS FROM JULY 1 THROUGH JUNE 30

THE COOLING DEGREE DAY SEASON EXTENDS FROM JANUARY 1 THROUGH DECEMBER 31
4

MONTHLY EXTREMES (RECORDS)

(1937-Date)

MONTH HIGH LAST LOW LAST LOW LAST HIGH LAST

 MAX OCCURRED MIN OCCURRED MAX OCCURRED MIN OCCURRED

JANUARY 77 01/26/75 8#* 01/13/63 28#* 01/21/37 58 01/20/99

FEBRUARY 87 02/26/86 16 02/07/89 34 02/06/89 59 02/26/89

MARCH 92 03/21/04 19 03/02/39 42 03/01/71 71 03/23/04

 

APRIL 99* 04/22/12 31* 04/02/75 48* 04/02/97 74* 04/30/07

MAY 109* 05/28/03 38 05/03/42 60 05/08/79 89 05/28/03

JUNE 116 06/15/40 48* 06/06/93 67 06/04/99 89* 06/30/09

JULY 117#* 07/19/05 56 07/21/40 81 07/08/92 95# 07/19/05

AUGUST 116 08/03/79 54 08/03/37 74 08/18/83 90 08/12/03

SEPTEMBER 113 09/01/50 43 09/27/48 67 09/18/65 86 09/01/07

OCTOBER 103 10/01/78 26 10/30/71 50 10/29/71 79 10/01/06

NOVEMBER 87 11/01/88 15 11/24/38 42 11/16/64 62* 11/06/09

DECEMBER 78 12/02/40 11 12/23/90 32 12/10/72 57 12/24/55

 # - EXTREMES FOR ENTIRE PERIOD OF RECORD (1937 TO DATE)

 * - ALSO IN PREVIOUS YEARS

PERIOD OF RECORD INCLUDES TWO MAJOR LOCATION MOVES ON DECEMBER 18TH 1948 FROM 

WHAT IS NOW KNOWN AS NELLIS AIR FORCE BASE (36 DEGREES 14 MINUTES NORTH -

115 DEGREES 02 MINUTES WEST) TO MCCARRAN INTERNATIONAL AIRPORT (36 DEGREES 05 

MINUTES NORTH - 115 DEGREES 10 MINUTES WEST) AND FINALLY TO ITS CURRENT LOCATION AT 

MCCARRAN INTERNATIONAL AIRPORT (36 DEGREES 04 MINUTES 44 SECONDS NORTH - 115 DEGREES 

09 MINUTES 19 SECONDS WEST).

 
5

JANUARY

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 69 1981 21 1954 39 2011* 47 1996 56/38

 2 69 1997* 13 1974 31 1974 52 1997 57/38

 3 69 1997 12 1974 32 1974 47 1998 57/39

 4 68 2012* 14 1970 33 1974 45 1981 57/39

 5 71 2003 12 1950 35 1971 49 2008 57/39

 6 74 1962 12 1971 35 1971 50 2003 57/39

 7 75 1962 15 1971 36 1971 52 1962 57/39

 8 74 1962 19 1937 28# 1937 47 1993 57/39

 9 72 1945 11 1937 31 1937 53 2005 57/39

10 69 1996 11 1937 35 1949 54 2005 57/39

 

11 73 1938 14 1937 36 1949 48 1980 58/39

12 71 1986 14 1963 29 1963 51 1980 58/39

13 73 1945 8# 1963 31 1963 48 1980 58/39

14 74 1945 14 1963 39 2007 50 1980 58/39

15 73 1945 20 1962 38 1997 45 1994 58/39

16 73 1976 23 1964 38 1949 50 2000 58/39

17 74 2011 20 1949 36 1949 52 2000 58/39

18 72 1971 20 1949 40 1949 51 2000 58/40

19 74 1971 10 1943 35 1949 51 1998 58/40

20 72 1986 17 1937 33 1937 (58) 1999 58/40

21 70 2009 13 1937 28# 1937 54 2000 59/40

22 74 1948 9 1937 31 1937 53 2009 59/40

23 76 1948 14 1937 35 1937 55 2009 59/40

24 75 1948 15 1937 31 1937 56 2000 59/40

25 75 1953 8# 1937 35 1949 56 2000 59/40

26 (77) 1975 10 1937 39 1949 53 2000 59/40

 

27 73 1971 12 1937 39 1949 52 1941 59/40

28 71 1971 18 1937 35 1979 49 1987 59/40

29 71 1976 17 1979 38 1979 50 1997 59/41

30 72 1971 18 1949 38 1979 54 1963 60/41

31 75 2003 19 1949 37 1979 55 1963 60/41

 # - INDICATES THE EXTREME TEMPERATURE FOR ENTIRE PERIOD OF RECORD.

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS.

 
6

FEBRUARY 

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 81 2003 17 1937 37 1985 58 1963 60/41

 2 77 1995 22 1951 35 1985 50 2003 60/41

 3 75 1995 19 1972 38 1939 48 2006 60/41

 4 76 1953 19 1948 43 1949 51 1976 60/41

 5 78 1947 18 1939 39 1989 50 2006 60/41

 6 78 1963 19 1989 (34) 1989 55 1950 61/42

 7 77 1963 (16) 1989 36 1989 49 1980 61/42

 8 76 1996 25 1949 36 1989 53 2007 61/42

 9 77 1951 19 1946 45 1939 53 2007 61/42

10 74 1951 19 1946 39 1939 54 1962 61/42

 

11 79 1971 22 1939 44 1948 54 2007 62/43

12 75 1954 22 1965 46 1949 51 1996 62/43

13 79 1957 20 1949 42 1949 52 1954 62/43

14 78 1957 18 1949 42 1990 56 2000 62/43

15 77 1977 22 1949 45 1990 50 1945 62/43

16 79 1996 24 1949 46 1956 55 1991 63/44

17 81 1996 21 1956 49 1956 52 1996 63/44

18 81 1977 17 1938 48 1938 58 1986 63/44

19 82 1981 25 1952 45 1955 58 1986 63/44

20 79 1995 23 1942 43 1955 55 1996 64/45

21 80 1977 21 1955 47 1955 54 1996 64/45

22 77 1961 20 1953 50 2004 54 1995* 64/45

23 79 2002 25 1953 47 1944 53 1957 65/45

24 82 1989 24 1955 49 1987 52 2003 65/46

25 85 1986 26 1960 40 1987 57 1989 65/46

26 (87) 1986 28 1971 40 1944 (59) 1989 65/46

 

27 83 1986 19 1971 39 1962 56 1940 66/46

28 82 1986 19 1962 45 1962 54 2006 66/46

29 76 1972 33 1996 47 1960 58 1972 66/47

( ) - INDICATES THE MONTHLY EXTREME. 

* - AND IN PREVIOUS YEARS.
7

MARCH

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2000

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 82 1986 23 1962 (42) 1971 56 1974 66/47

 2 82 1967 (19) 1939 47 1951 57 1990 67/47

 3 85 1972 23 1971 46 1976 60 1999 67/47

 4 84 1972 25 1966 50 1966 58 1972 67/47

 5 84 1972 26 1948 51 1976 53 1986 68/48

 6 85 1972 24 1939 51 1964 54 2001 68/48

 7 84 1972 28 1940 49 1964 55 2007 68/48

 8 87 1989 26 1942 43 1952 62 1989 68/48

 9 87 1989 27 1964 53 2010 61 1954 69/48

10 89 1972 29 1962 44 1969 59 1982 69/48

 

11 86 1989 26 1948 47 1958 65 1989 69/49

12 86 1989 27 1940 51 1990 66 1989 69/49

13 90 2007 25 1956 47 1969 58 2007* 70/49

14 89 2007 27 1962 49 1944 64 2003 70/49

15 87 2007 26 1962 48 1991 61 2007 70/49

16 89 2007 31 1991 52 1963 64 2011 70/50

17 91 2007 30 1955 55 1963 64 1994 71/50

18 88 1972 30 1954 54 2012 64 1974 71/50

19 88 1939 31 1937 51 1979 60 2007 71/50

20 90 2004 34 1964 49 1991 58 2007* 71/50

21 (92) 2004 26 1955 51 2006 62 2009* 72/50

22 91 2004 28 1948 49 1973 61 2004 72/50

23 89 2004* 32 1938 48 1964 (71) 2004 72/51

24 89 1940 34 1957 53 1995 66 1998 72/51

25 87 1981 31 1964 50 1977 63 2001 73/51

26 87 1947 34 1948 53 1975 65 1971 73/51

27 88 1988 33 1975 49 1991 60 1990 73/51

28 89 1986 31 1975 48 1975 58 1997 73/51

29 86 1966 33 1975 50 1998 60 1986 74/52

30 88 2004* 33 1987 57 1938 63 2010 74/52

31 91 1966 25 1938 48 1949 62 2011 74/52

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS.

 
8

APRIL

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 92* 2011 35 1948 55 1980 63 2001 74/52

 2 95 1966 (31) 1975 (48) 1997 70 2011 74/52

 3 91 1961 (31) 1955 52 1965 62 2007 75/53

 4 94 1961 (31) 1945 51 1965 63 1989 75/53

 5 94 1960 32 1945 59 1965 65 2007 75/53

 6 95 1989 35 1945 60 1983 66 2007 75/53

 7 98 1989 36 1939 53 1958 64 2007 76/54

 8 98 1989 39 1983 56 1965 65 2007 76/54

 9 95 1989 32 1953 54 1943 65 2000 76/54

10 91 1985 38 1950 55 1965 70 2002 77/54

 

11 88 2002 35 1965 54 1965 64 1989 77/55

12 91 1990 32 1967 (48) 1965 72 2002 77/55

13 93 1990 35 1967 58 1972 68 2000 77/55

14 95 2002 38 1983 57 1939 66 2002 78/55

15 97 1947 34 1939 56 1998 64 1994 78/56

16 95 1989 39 1998* 55 1976 66 1962 78/56

17 97 1989 40 1976 56 1963 69 1989 79/56

18 98 1946 35 1963 60 1995 68 1994 79/57

19 98 1938 35 1968 60 1972 65 1994 79/57

20 97 1994 34 1966 62 1967 69 1989 80/57

21 98 1950 37 1966 52 1957 71 1989 80/58

22 (99) 2012 33 1963 56 2010 70 2012* 80/58

23 98 2012* 36 1937 58 1999 71 2012 81/58

24 (99) 1946 38 1937 58 1999* (74) 1943 81/59

25 96 1946 37 1960 64 1971 73 2012 81/59

26 97 1996 42 1967 59 1984 67 1981 82/59

27 (99) 2000 39 1984 59 1970 70 1996 82/60

28 97 2007 39 1955 55 1970 71 1943 82/60

29 98 2007 35 1970 56 1999 71 2008 83/61

30 (99) 1981* 38 1967 56 1999 (74) 2007 83/61

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS.
9

MAY

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 102 1947 41 1967 62 1955 73 2012* 84/61

 2 107 1947 43 1955 65 1955 72 2006 84/62

 3 108 1947 (38) 1942 67 1950 71 2006 84/62

 4 108 1947 40 1959 67 1964 74 2004 85/62

 5 108 1947 40 1950 65 1973 75 2004 85/63

 6 103 1947 43 1964 63 1964 71 2000 85/63

 7 102 1989 41 1938 62 1964 73 2004* 86/63

 8 102 1989 42 1964 (60) 1979 74 1989 86/64

 9 100 2001 42 1938 69 2003 72 2006 87/64

10 102 1940 41 1948 68 1991 75 2001 87/64

 

11 103 1960 47 1938 63 1989 72 2012* 87/64

12 104 1996 45 1963 67 1961 74 1993 88/65

13 103 1996 45 1953 66 1998 79 2006 88/65

14 106 1937 45 1998 66 1962 77 1997 88/65

15 107 1937 44 1968 61 1951 77 2006 89/66

16 107 1937 43 1953 67 1962 78 2006 89/66

17 102 2009* 43 1962 71 1977 78 2012* 89/66

18 104 2008 45 1977 67 2011 77 2009* 90/67

19 108 2008 47 1974 63 1974 80 2006 90/67

20 102 2005 46 1975 69 1975 82 2008 90/67

21 104 2012* 42 1975 66 1957 76* 2009 91/67

22 108 2000 45 1975 73 1971 79 2012 91/68

23 107 2000 48 1980 63 2010 78 2012 91/68

24 105 2001 46 1939 61 1965 81 2000 92/68

25 105 2001 47 1977 69 1996 77 2001 92/68

26 (109) 1951 50 1980 74 1998* 79 2001 92/69

27 108 1974 44 1953 73 1971 80 2001 93/69

28 (109) 2003 50 1971 64 1971 85 2000 93/69

29 108 1984 46 1953 66 1971 (89) 2003 93/70

30 106 2002* 48 1971 74 1988 83 2003 94/70

31 104 2002* 47 1937 68 1991 82 1997 94/70

 

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS.
10

JUNE

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 107 2012* 50 1991 74 1955 80 2002 94/70

 2 107 2003 49 1955 76 1999 83 2012* 95/71

 3 107 1957 53 1961 69 1949 81 2003 95/71

 4 109 1996* 50 1999 (67) 1999 83 2007 95/71

 5 108 1996 51 1993 75 1993 83 2003 96/71

 6 110 2010 (48) 1993 70 1993 82 2010 96/72

 7 108 1955 52 1954 68 1995 86 2010 96/72

 8 111 1955 52 1995 76 1995 83 2010 97/72

 9 111 1985 50 1950 75 1954 83 2001 97/73

10 108 1996 51 1954 75 1957 80 2001 97/73

 

11 109 1956 55 1976 83 1976 81 1996 97/73

12 112 1940 52 1937 79 2010 81 1994 98/74

13 114 1940 49 1938 77 1997 82 1985 98/74

14 115 1940 55 1943 75 1997 83 1979 98/74

15 (116) 1940 52 1962 80 1962 83 2007* 99/75

16 114 1940 53 1944 70 1995 87 2000 99/75

17 113 1940 50 1944 79 1995 87 2008 99/75

18 115 1940 49 1939 82 1979 86 2012 100/75

19 114 1940 56 1939 85 1975 85 2006 100/76

20 113 1961 53 1939 86 1975 84 1996 100/76

21 111 1954 53 1941 86 1947 83 1999 100/76

22 115 1954 56 1944 91 1976 85 2008 101/77

23 113 1959 55 1944 86 1963 86 2011 101/77

24 113 1961 56 1963 86 2003 85 2006 101/77

25 115 1970 55 1941 86 1975 86 1974 102/78

26 114 1970 56 1944 81 1965 86 1994 102/78

27 114 1977 59 1941 83 1991 86 1994 102/78

28 115 1994 55 1941 91 1996* 87 1994 102/78

29 115 1994 60 1941 85 1938 87 1977 103/79

30 115 1994 60 1970 83 1982 (89) 2009* 103/79

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS.

 
11

JULY

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 116 1972 58 1938 88 1980 90 1994 103/79

 2 115 1950 62 1943 93 1980 89 2002 103/79

 3 116 1937 60 1943 (81) 1961 89 1996 103/80

 4 115 1985 60 1941 89 1949 88 2008 104/80

 5 116 2007* 60 1938 89 1937 87 2008 104/80

 6 115 2007* 63 1939 84 1950 90 1957 104/80

 7 114 1989 62 1939 88 2001 90 2007 104/80

 8 113 1989 60 1938 (81) 1992 91 1989 104/81

 9 113 2012* 63 1938 89 1999 87 2012 104/81

10 114 2012* 64 1948 91 1974 89 2002 104/81

 

11 116 1959 62 1944 87 1989 91 2012 104/81

12 114 2003* 62 1937 87 1999 88 2010 104/81

13 115 1939 64 1944 85 1999 89 2003* 105/81

14 116 1972 63 1952 93 2012 92 2002 105/81

15 114 1949 62 1944 89 1974 89 2007 105/81

16 116 1998 65 1944 91 1953 91 2010 105/81

17 116 2005 62 1940 90 1953 93 2005 105/81

18 116 2005 59 1940 85 1985 92 2005 105/81

19 (117)# 2005 (56) 1937 90 1943 (95)# 2005 105/82

20 113 1959 58 1940 (81) 1979 94 2005 105/82

21 113 1942 (56) 1940 86 1986 90 2005 105/82

22 114 1937 62 1943 85 1984 92 2006* 105/82

23 115 1942 61 1938 89 1998* 92 2003 105/82

24 (117)# 1942 64 1957 86 1965 89 2006 105/82

25 115 1942 66 1944 87 1954 89 2006 105/82

26 116 1943 65 1944 91 1950 92 2010 104/81

 

27 115 1943 63 1944 90 1969 89 2010 104/81

28 114 1995 61 1984 84 1984 90 2009 104/81

29 115 1995 64 1984 92 1999 88 2011* 104/81

30 114 1978 64 1941 87 1976 88 2011* 104/81

31 115 1978 65 1940 86 2012 88 2010 104/81

 # - INDICATES THE EXTREME TEMPERATURE FOR ENTIRE PERIOD OF RECORD.

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS.
12

 AUGUST

 

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 (116) 1979 64 1942 86 2003 86 2002 104/81

2 115 1979 55 1937 94 1991 89 2008 104/81

 3 (116) 1979 (54) 1937 81 1951 89 2008 104/81

 4 114 1979 58 1937 82 1970 86 1995 104/81

 5 113 1969 63 1953 89 1992 85 2010* 104/81

 6 114 1978 64 1950 95 2009* 88 1994 103/81

 7 112 1942 63 1950 91 2009 88 1997* 103/81

 8 114 1978 64 1957 91 1938 88 1995 103/81

 9 114 1940 65 1951 86 2005 87 2012 103/80

10 115 1940 60 1937 82 1983 89 1995 103/80

 

11 (116) 1940 60 1948 86 1991 88 2012 103/80

12 115 1937 60 1949 82 1979 (90) 2003 103/80

13 113 1937 60 1949 83 1972 88 2012 103/80

14 111 2002 64 1984 83 1984 86 2007 102/80

15 111 2002 60 1938 85 1990 85 2012 102/80

16 113 1939 58 1938 84 1943 88 2008 102/80

17 111 1939 55 1938 (74) 1983 86 1994 102/79

18 111 1992 60 1944 (74) 1983 85 1973 102/79

19 111 1992 60 1938 81 1983 86 2007 102/79

20 110 1950 55 1938 78 1957 87 1992 102/79

21 110 2009 63 1957 (74) 1957 86 2010 101/79

22 110 1939 60 1968 84 2012 86 2010 101/79

23 110 2011 56 1947 88 2012* 85 1998 101/78

24 112 2011 56 1968 80 1982 86 2006 101/78

25 111 2011 59 1944 84 1982 86 2011* 101/78

26 109 2001 55 1943 91 1982 87 2011 101/78

27 109 2001 60 1943 90 1972 87 2011 100/78

28 110 1944 58 1945 84 1951 83 2011* 100/77

29 110 1948 57 1947 82 2000 85 2011* 100/77

30 112 1948 55 1947 80 2000 87 2011 100/77

31 112 1948 55 1942 86 1991 85 2011 99/77

 

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS
13

SEPTEMBER

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 (113) 1950 57 1942 80 1960 (86) 2007 99/76

 2 110 1950 56 1964 79 1940 84 2007 99/76

 3 108 1982 55 1942 78 1997 85 2007 99/76

 4 111 1947 57 1941 79 1939 85 2007 98/76

 5 109 1977 52 1940 80 1970 83 2007 98/75

 6 110 1955 54 1970 70 1939 84 2012 98/75

 7 108 1977 56 1938 79 1950 83 2012 97/75

 8 110 1979 56 1965 84 1941 80 2012* 97/74

 9 108 1944 50 1941 81 1975 81 1999 97/74

10 108 1945 48 1941 79 1976 81 1994 96/74

 

11 109 1945 54 1952 77 1985 80 1960 96/73

12 108 1948 53 1985 80 1988 82 1993 96/73

13 109 1948 52 1952 78 2011 84 2007 95/72

14 107 1945 50 1941 77 2011 82 2007 95/72

15 107 2000* 49 1941 83 1986 77 1955 95/72

16 107 1937 49 1941 79 2006 79 2003* 94/71

17 108 1937 53 1941 71 1965 78 2000 94/71

18 108 1937 53 1965 (67) 1965 79 1980 93/70

19 104 2010* 47 1965 70 1985 78 1962 93/70

20 103 1951 46 1965 72 1952 79 2010* 92/69

21 104 1943 49 1978 75 1988 77 2000 92/69

22 104 1949 51 1944 72 1941 74 2012* 92/69

23 104 1947 46 1941 73 1986 76 2012* 91/68

24 106 1947 45 1941 69 1986 79 1992 91/68

25 106 1947 47 1945 68 1939 82 2002 90/67

26 105 1947 45 1948 75 1986 74 2008 90/67

 

27 104 1947 (43) 1948 68 1986 78 2008 89/66

28 103 2010* 48 1971 68 1986 79 2008 89/66

29 102 1978 51 1940 75 1959 76 2009 88/66

30 101 1978 47 1982 69 1982 78 2010 88/65

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS
14

OCTOBER

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 (103) 1978 42 1971 69 1971 (79) 2006 87/65

 2 100 1980 43 1971 59 2002 76 2010* 87/64

 3 99 2012* 44 1950 71 1969 75 2000 86/64

 4 100 1947 43 1940 69 1969 72 2012* 86/63

 5 99 1980 41 1937 65 1946 73 1988 86/63

 6 98 1980 43 1969 65 2011 72 1990 85/62

 7 99 1978 36 1941 68 1938 73 1960 85/62

 8 98 1964 41 1941 59 1961 70 2005 84/62

 9 97 1996* 41 1949 61 1961 70 2012* 84/61

10 97 1996* 40 1961 64 1960 73 2003 83/61

 

11 95 1991 43 1961 60 2008 70 2002 83/60

12 97 1950 38 1946 62 2008 71 1991 82/60

13 95 1992 41 1946 66 1981 64 2004 82/60

14 96 1950 42 1981 65 1966 69 1992 82/59

15 94 1958 43 1966 66 1994 70 1950 81/59

16 96 1991 42 1984 60 1971 66 2010* 81/58

17 94 1991 38 1938 57 1971 67 1991 80/58

18 95 1958 35 1938 60 1971 63 2009* 80/58

19 96 1940 35 1946 57 1949 70 1958 79/57

20 95 1940 36 1943 58 1949 64 2003* 79/57

21 94 2003 32 1949 59 2004 67 2012 78/57

22 92 2003 38 1996 54 1953 64 2003* 78/56

23 94 1959 37 1953 60 1953 63 2003* 78/56

24 92 1959 36 1953 60 1956 66 2003 77/55

25 92 1937 32 1945 64 1954 68 2011 77/55

26 90 1937 35 1945 56 1951 60 1950 76/55

27 92 1937 35 1939 58 1996 63 2008 76/54

28 91 1937 32 1970 53 1996 66 1999* 75/54

29 90 1950* 30 1971 (50) 1971 65 1988 75/54

30 87 1937 (26) 1971 52 1971 66 1950 74/53

31 86 1988 30 1971 51 1961 66 2008 74/53

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS.
15

NOVEMBER

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 (87) 1988 29 1943 59 1956 61 2008 73/52

 2 84 1937 28 1943 56 1974 59 2008 73/52

 3 86 2010 26 1943 52 1994 60 2010* 73/52

 4 85 1988 26 1956 56 1957 60 2010 72/51

 5 84 1980 28 1940 50 1957 60 2001 72/51

 6 85 1988 27 1940 57 1938 (62) 2009 71/50

 7 84 2007 23 1938 58 2000 60 2007 71/50

 8 83 1950 24 1938 55 1946 (62) 2002 70/50

 9 82 1978 26 1945 55 1966 60 2006 70/49

10 81 1990 27 1948 52 1950 61 2005 69/49

 

11 85 1973 24 1950 51 2000 58 1980 69/48

12 81 1973 24 1950 48 1985 (62) 1983 68/48

13 81 1953 16 1938 49 1985 (62) 1981 68/47

14 81 1995 22 1938 45 1964 61 1981 67/47

15 82 1981 24 1938 47 1964 54 1942 67/47

16 78 1977 24 1938 (42) 1964 52 1999 66/46

17 81 2008 28 1958 43 1964 58 1999 66/46

18 79 1949 23 1958 48 1964 58 1942 65/45

19 78 1976 24 1985 46 1985 55 1950 65/45

20 76 2007* 23 1956 46 1953 57 2007 64/45

21 77 1976 24 1945 48 2004 57 1996 64/44

22 77 1976 24 1941 50 2004 55 1996 63/44

23 76 1995* 24 1941 48 1952 50 2006* 63/43

24 81 1949 (15) 1938 47 2003 50 1998* 62/43

25 76 1970 18 1938 47 1988 54 2008* 62/43

26 75 1997* 24 1944 49 1984 54 1995 61/42

 

27 79 1954 21 1952 45 1984 50 2008* 61/42

28 73 1977 19 1938 48 1976 48 1939 60/42

29 74 2000 21 1948 46 2006 53 1982 60/41

30 79 1980 22 1948 47 2006* 50 1961 60/41

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS
16

 DECEMBER

TEMPERATURE EXTREMES - 1937 TO DATE

DAILY NORMALS - 1981 TO 2010

 HI LAST LO LAST LO LAST HI LAST NORMAL

DATE MAX OCCURD MIN OCCURD MAX OCCURD MIN OCCURD MAX/MIN

 1 74 1940 26 1957 51 2004* 52 1999 59/41

 2 (78) 1940 24 1948 51 1991 56 2005 59/41

 3 77 1980 23 1948 48 1984 50 2001 59/40

 4 76 1939 24 1948 50 2009* 52 1980 58/40

 5 76 1938 18 1948 42 1972 52 1956 58/40

 6 76 1938 23 1942 41 1978 55 1966 58/40

 7 76 1938 21 1948 39 1978 56 2003 57/39

 8 77 1939 23 1978 38 1978 48 1988 57/39

 9 71 1975 16 1956 37 1972 51 1970 57/39

10 74 1950 20 1972 (32) 1972 52 1996 57/39

 

11 72 1939 21 1972 36 1972 50 1996 57/39

12 74 1958 15 1949 34 1972 51 1995 56/39

13 70 1952 19 1949 35 1967 55 1995 56/39

14 72 1942 16 1945 36 1967 46 1995 56/38

15 75 1980 14 1940 40 1987 54 2010* 56/38

16 74 1980 23 1964 41 1940 49 2002 56/38

17 71 1942 20 1945 39 2008 46 1952 56/38

18 72 1939 22 1945 42 1984 48 1962 56/38

19 68 1942 22 1945 42 1970 55 2010 56/38

20 73 1981 14 1945 39 1968 50 2010 56/38

21 68 1950 20 1990 35 1990 51 1981 56/38

22 68 1950 12 1990 34 1990 49 1982 56/38

23 74 1955 (11) 1990 33 1990 49 1994 56/38

24 70 2005* 14 1990 39 1990 (57) 1955 56/38

25 69 1964 17 1948 40 1962 50 1955 56/38

26 73 1980 20 1962 39 1941 50 2005 56/38

27 70 1980 19 1988 36 1941 49 1955 56/38

28 73 1980 20 1954 42 1988 47 1980 56/38

29 73 1980 23 1962 43 1982 52 1951 56/38

30 70 1980 15 1990 40 1990 48 1996* 56/38

31 74 1995 18 1990 38 2010 48 2004 56/38

 

( ) - INDICATES THE MONTHLY EXTREME. 

 * - AND IN PREVIOUS YEARS
17

TOP 10 WETTEST AND DRIEST YEARS AND OVERALL MONTHS

(1937-Date)

 

 10 WETTEST MONTHS 10 DRIEST MONTHS

 * 4.80...MAR 1992 0.00 MANY TIMES

 * 3.39...SEP 1939 

 * 3.00...JAN 1995

 * 2.89...FEB 1998

 *2.59...AUG 1957

 2.52...FEB 1993

 2.49...FEB 1976

 * 2.48...JUL 1984

 2.45...FEB 2005

 * 2.44...APR 1965

 

 * INDICATES WETTEST ALL TIME FOR THAT PARTICULAR MONTH 

 

 

 10 WETTEST YEARS 10 DRIEST YEARS

 10.72...1941 0.56...1953

 9.88...1992 0.76...1948#

 7.96...1965 1.11...1968

 7.76...2004 1.12...1964

 7.65...1978 1.27...1985

 7.37...2005 1.44...2002

 7.35...1998 1.45...1962

 7.30...1939 1.59...2009

 6.86...2003 1.69...2006

 6.85...1984 1.91...1966

 

# INTERRUPTED DURING MOVE
18

TOP 10 WETTEST AND DRIEST MONTHS BY MONTH

(1937-Date)

 10 WETTEST MONTHS (BY MONTH) 10 DRIEST MONTHS (BY MONTH)

 JANUARY JANUARY 

 

 3.00.....1995 0.00.....1976 (MOST RECENT)

 2.41.....1949 TRACE....2012 (MOST RECENT)

 2.18.....1979 

 2.07.....2005 

 2.04.....2010 

 2.00.....1974 

 1.63.....1993 

 1.57.....1969 

 1.55.....1939 

 1.45.....1980 

 FEBRUARY FEBRUARY

 

 2.89.....1998 0.00.....1977 (MOST RECENT)

 2.52.....1993 TRACE....2002 (MOST RECENT)

 2.49.....1976 

 2.45.....2005 

 2.25.....1980 

 2.21.....2001 

 2.13.....2003 

 1.64.....1973 

 1.59.....2000 

 1.58.....1941 

 MARCH MARCH

 

 4.80.....1992 0.00.....1997 (MOST RECENT)

 1.83.....1973 TRACE....2009 (MOST RECENT)

 1.63.....1941 

 1.58.....1945 

 1.50.....1952 

 1.44.....1981 

 1.17.....1938 

 1.13.....1978 

 1.07.....1975 

 1.03.....1998 

 

 APRIL APRIL 

 2.44.....1965 0.00.....2011 (MOST RECENT)

 1.68.....1941 TRACE....2006 (MOST RECENT)

 0.92.....2004 

 0.85.....1943 

 0.76.....1988 

 0.73.....1999 

 0.64.....1958 

 0.57.....1952 

 0.55.....1939 

 0.55.....1957
19

10 WETTEST AND DRIEST MONTHS BY MONTH (CONT)

 MAY MAY

0.96.....1969 0.00.....2012 (MOST RECENT)

0.90.....1987 TRACE....2010 (MOST RECENT)

0.84.....1971 

0.72.....1977 

0.64.....1989 

0.54.....1978 

0.50.....1981 

0.46.....1972 

0.40.....1965 

 0.35.....1979/1975 

 

 

 JUNE JUNE

 0.97.....1990 0.00.....2012 (MOST RECENT)

 0.82.....1967 TRACE....2010 (MOST RECENT)

 0.39.....1955 

 0.32.....1972 

 0.31.....1968 

 0.23.....1938 

 0.23.....1969

 0.22.....1984 

 0.19.....1991 

 0.18.....1970

 

 

 JULY JULY 

2.48.....1984 0.00.....1993 (MOST RECENT) 

 2.18.....1999 TRACE....2010 (MOST RECENT)

 1.95.....1976 

 1.68.....1945 

 1.64.....1956 

 1.61.....1954 

 1.55.....1955 

 1.34.....1950 

 1.08.....2003 

 0.93.....1941 

 

 AUGUST AUGUST

 2.59.....1957 0.00.....2002 (MOST RECENT)

2.28.....2012 TRACE....2010 (MOST RECENT)

 2.12.....1979 

1.79.....1970 

1.77.....1942 

 1.75.....1941 

 1.74.....1955 

 1.38.....1977 

 1.25.....1983 

 0.99.....1984 
20

10 WETTEST AND DRIEST MONTHS BY MONTH (CONT)

 SEPTEMBER SEPTEMBER

 3.39.....1939 0.00.....2006 (MOST RECENT)

 2.06.....1997 TRACE....2009 (MOST RECENT)

 1.58.....1963 

 1.29.....1998 

 1.18.....2012 

 1.17.....1975 

 1.09.....1976 

 1.03.....1967 

 0.98.....1951 

 0.88.....1940 

 

 

 OCTOBER OCTOBER

 1.45.....2005 0.00.....2007 (MOST RECENT)

 1.22.....1992 TRACE....2009 (MOST RECENT)

 1.13.....1941 

 1.13.....1947 

 1.12.....1972 

 1.07.....2006 

 0.92.....2000 

 0.82.....2010 

 0.70.....1976 

 0.66.....1946 

 

 

 NOVEMBER NOVEMBER 

 2.22.....1965 0.00.....2006 (MOST RECENT)

 1.88.....1960 TRACE....2000 (MOST RECENT)

 1.80.....1987 

 1.71.....2004 

 1.52.....1967 

 1.09.....1959 

 1.09.....1972 

 1.04.....1946 

 0.96.....1958 

 0.94.....1984 

 

 DECEMBER DECEMBER

 2.10.....2004 0.00......1981 (MOST RECENT)

 1.78.....1940 TRACE.....1999 (MOST RECENT)

 1.77.....2010 

 1.71.....1992 

 1.68.....1984 

 1.38.....1959 

 1.34.....1943 

 1.15.....1978 

 1.06.....1977

 1.02.....2008
21

MEASURABLE PRECIPITATION DAYS AND EXTREMES

 NORMAL (.01 DAYS) MOST EVER (.01 DAYS)

 (1981-2010) (1937-TO DATE)

 JAN......3.1 13.....1995

 FEB......4.0 12.....1998

 MAR......2.9 12.....1973

 APR......1.6 8.....1965 

 MAY......1.2 4.....1995 (MOST RECENT)

 JUN......0.6 3.....1972/1967/1949

 JUL......2.5 8.....1984/1976

 AUG......2.6 9.....1983

 SEP......1.6 8.....1967/1939

 OCT......1.7 8.....1946

 NOV......1.7 6.....1978/1965/1946

 DEC......3.0 9.....1992/1984

 YEARLY

 AVG.....26.5

 NORMAL (.10 DAYS) MOST EVER (.10 DAYS)

 (1981-2010) (1937-TO DATE) 

 JAN.....1.5 7.....1995 (MOST RECENT)

 FEB.....2.0 8.....1998 

 MAR.....1.2 9.....1992

 APR.....0.4 6.....1965

 MAY.....0.3 3.....1977

 JUN.....0.2 2.....1990 (MOST RECENT)

 JUL.....1.0 5.....1950

 AUG.....0.9 4.....1983/1972

 SEP.....0.6 5.....1939

 OCT.....0.9 4.....2006/2000/1974

 NOV.....0.8 3.....2004 (MOST RECENT)

 DEC.....1.4 6.....1943

 YEARLY

 AVG....11.2
22

CONSECUTIVE WET AND DRY DAYS

(1937-Date)

CONSECUTIVE WET DAYS (0.01 INCH OR GREATER)@

6.....2/24/2003

6.....4/06/1943

5.....1/12/1993

5.....1/18/2010

5.....8/06/1983

5.....1/04/1974

5.....1/09/1949

5.....2/27/1938

CONSECUTIVE DAYS WITH A TRACE OR BETTER @

 10.....2/17/2005 

9.....2/05/1978

9.....7/23/1952

9.....2/14/1941

7.....12/17/2010

7.....8/18/1999

7.....9/03/1998

7.....1/12/1993

7.....4/06/1965

7.....7/30/1947

 

@ Dates are first day of occurrence

CONSECUTIVE DRY DAYS*

101.....7/02/1944-10/10/1944

100.....3/25/2002-7/02/2002

84.....5/02/1978-7/24/1978

CONSECUTIVE DAYS WITHOUT MEASURABLE PRECIPITATION**

150.....2/22/1959-7/21/1959

146.....3/09/2000-8/01/2000

145.....5/31/1944-10/22/1944

143.....2/12/1950-7/04/1950

140.....9/22/1999-2/09/2000

*Dry days are defined as having less than a trace (T) of precipitation.

**Measurable precipitation is defined as a hundredth (0.01) or greater.
23

PRECIPITATION RECORDS

(1937-Date)

(MAXIMUM MONTHLY 24 HOUR PRECIPITATION)

 

JANUARY 1.09.....1990

FEBRUARY 1.30.....1993

MARCH 1.27.....1992

APRIL 0.97.....1965

MAY 0.83.....1987

JUNE 0.97.....1990

JULY 1.36.....1984

AUGUST 2.59.....1957 

SEPTEMBER 1.12.....1939

OCTOBER 1.37.....2005

NOVEMBER 1.78.....1960

DECEMBER 2.10.....2004

MOST PRECIPITATION IN 24 HOURS

2.59.......8/20-21/1957

2.10......12/28-29/2004

1.98.......8/21-22/2012

1.78......11/05-06/1960

1.75.......8/09-10/1942

1.56..........8/12/1979

1.37......10/17-18/2005

1.36..........7/28/1984

1.34.......8/16-17/1977

1.32.......8/03-04/1955

1.32..........7/24/1956
24

10 COLDEST AND HOTTEST YEARS AND OVERALL MONTHS

(1937-Date)

 

 10 COLDEST YEARS 10 HOTTEST YEARS

 64.1.....1941 71.1.....2007

 64.2.....1949 70.0.....2008

 64.3.....1937 70.0.....2005

 64.3.....1938 70.0.....2003 

 64.6.....1948 69.9.....2009

 64.8.....1955 69.8.....2006

 64.8.....1964 69.7.....2000

 64.8.....1971 69.6.....2001

 65.0.....1951 69.5.....2010

 65.1.....1939/65/82 69.4.....2004

 10 HOTTEST YEARS 10 HOTTEST YEARS 

FOR MAXIMUM TEMPERATURE FOR MINIMUM TEMPERATURE

 83.0.....1940 60.2.....2007

 83.0.....1947 60.0.....2005

 82.8.....1943 59.4.....2003

 82.3.....1942 59.4.....2010

 82.3.....1977 59.3.....2009

 82.0.....1989 59.3.....2008

 81.9.....2007 59.2.....2006

 81.9.....1981 59.0.....2004

 81.9.....1950 58.6.....2001

 81.7.....1946* 58.6.....2000

 10 COLDEST YEARS 10 COLDEST YEARS 

FOR MAXIMUM TEMPERATURE FOR MINIMUM TEMPERATURE

 77.0.....1982 47.2.....1937

 77.5.....1983 47.8.....1938

 77.6.....1998 48.3.....1948

 77.8.....1965 48.9.....1939

 78.0.....1971 49.6.....1941

 78.3.....1964 49.7.....1942

 78.4.....1984 50.2.....1949

 78.5.....1949 50.3.....1944

 78.6.....1975 50.4.....1945

 78.6.....1957/1955 50.4.....1940

10 COLDEST OVERALL MONTHS 10 HOTTEST OVERALL MONTHS

 31.2.....JAN 1937 96.2.....JUL 2010

 32.4.....JAN 1949 95.4.....JUL 2007

 40.2.....DEC 1990 95.3.....JUL 2005

 40.8.....DEC 1968 94.8.....JUL 2003

 40.9.....JAN 1973 94.7.....JUL 2009

 41.0.....JAN 1960 94.6.....JUL 2006

 41.0.....JAN 1974 94.5.....JUL 2002

 41.1.....JAN 1955 93.9.....AUG 2011

 41.1.....JAN 1963 93.7.....JUL 2008

 41.1.....JAN 1979* 93.4.....JUL 1959

* and previous years
25

10 COLDEST AND HOTTEST MONTHS BY MONTH

(1937-Date)

 COLDEST HOTTEST

 JANUARY JANUARY

 

31.2.....1937 54.1.....2003

32.4.....1949 51.7.....1986 

40.8.....1973 51.4.....2005

41.0.....1974 51.4.....2000

41.0.....1960 51.0.....2009

41.0.....1955 51.0.....1981

41.1.....1979 50.5.....1999

41.1.....1963 50.3.....1953

41.2.....1950 50.2.....2006

41.8.....1952 49.5.....1980

 FEBRUARY FEBRUARY

 

41.2.....1939 58.7.....1995

41.7.....1949 55.9.....1991 

43.7.....1955 55.8.....1963

44.8.....1937 55.8.....1986

45.6.....1956 55.7.....1968

45.6.....1964 54.9.....1957

45.8.....1966 54.8.....1996

46.0.....1960 54.7.....2007

46.3.....1942 54.2.....1977

46.3.....1969 54.1.....1954*

 MARCH MARCH

 

50.4.....1948 66.5.....2004

50.4.....1952 64.4.....2007

50.6.....1973 63.7.....1972

51.2.....1962 63.4.....1989

52.1.....1958 63.0.....1986

52.2.....1954 62.7.....1994

52.3.....1964 62.7.....1997

52.6.....1977 61.1.....2008

52.7.....1991 60.9.....1993

52.9.....1969 60.7.....2011

 

 APRIL APRIL

 

56.2.....1967 72.7.....1989 

56.6.....1975 71.2.....2000

58.4.....1963 70.6.....1981

58.5.....1983 70.5.....2007

58.6.....1970 70.5.....1992

59.1.....1941 70.3.....1962

60.3.....1955 69.7.....2002

60.9.....1999 69.6.....1954

61.0.....1998 69.1.....2012

61.1.....1965 69.1.....1946
26

10 COLDEST AND HOTTEST MONTHS BY MONTH (CONT)

 MAY MAY

 66.2.....1953 83.6.....2009

 67.7.....1977 82.2.....2001

 68.0.....1971 81.6.....1997

 68.9.....1980 81.0.....2006

 69.2.....1957 80.8.....2000

 69.6.....1965 80.7.....2012

 69.9.....1991 80.7.....1984

 70.0.....1998 80.5.....2007

 70.2.....1938 79.1.....2004

 70.2.....1955 79.0.....2005

 

 

 JUNE JUNE

 77.6.....1944 90.5.....2006

 78.0.....1965 90.3.....1994

 78.6.....1963 89.5.....2007

 78.8.....1941 89.2.....2012

 79.6.....1967 89.1.....1974

 80.0.....1998 88.8.....1981

 80.2.....1943 88.7.....2008

 80.3.....1952 88.7.....2000

 80.8.....1945 88.1.....2004

 80.9.....1995* 88.1.....2002

 JULY JULY

 86.9.....1976 96.2.....2010

 86.9.....1987 95.4.....2007

 87.0.....1938 95.3.....2005

 87.1.....1955 94.8.....2003

 87.1.....1944 94.7.....2009

 87.1.....1941 94.6.....2006

 87.6.....1986 94.6.....2002

 87.8.....1937 93.7.....2008

 88.1.....1984 93.4.....1959

 88.1.....1982* 93.3.....1994* 

 AUGUST AUGUST

 83.0.....1941 93.9.....2011

 83.5.....1968 93.1.....1995

 83.8.....1983 93.0.....2008

 85.0.....1949 92.9.....1994

 85.4.....1984 92.6.....2012

 85.5.....1951 92.5.....2007

 85.5.....1976 92.2.....1969 

 85.9.....1979 92.0.....1998

 85.9.....1938 91.9.....2001 

 86.0.....1954 91.9.....1996
27

10 COLDEST AND HOTTEST MONTHS BY MONTH (CONT)

 

 SEPTEMBER SEPTEMBER

 73.0.....1941 86.2.....2009

 74.8.....1965 85.4.....2012

 75.3.....1986 85.3.....1979

 75.4.....1985 85.2.....2010

 75.6.....1961 85.1.....2001

 75.7.....1939 84.8.....2008

 76.3.....1940 84.4.....2003

 77.2.....1970 84.0.....2011

 77.3.....1942 83.7.....1995 

 77.6.....1971 83.7.....1992*

 

 

 OCTOBER OCTOBER

 60.7.....1941 75.4.....2003

 61.5.....1946 74.9.....1988

 61.7.....1971 73.5.....1978

 62.8.....1969 72.2.....1991

 63.0.....1982 72.1.....2001

 63.0.....1984 72.0.....1964

 63.3.....1949 71.8.....1952

 63.4.....1938 71.8.....1950

 63.5.....1972 71.6.....1999

 63.7.....1957 71.4.....1977

 

 NOVEMBER NOVEMBER

 

 46.0.....1938 60.9.....2007

 49.0.....1957 60.8.....2008

 49.4.....1994 59.8.....1995

 49.4.....1952 59.3.....2005

 49.6.....1948 59.2.....2009

 49.7.....1972 58.9.....1949

 49.9.....1964 58.8.....1999

 50.1.....1940 58.6.....2001

 50.2.....2000 58.4.....2006

 50.3.....1961* 58.0.....1981*

 

 DECEMBER DECEMBER

 40.2.....1990 52.7.....1980 

 40.8.....1968 51.9.....1977

 41.1.....1948 51.3.....2010

 41.3.....1972 51.2.....1950

 41.4.....1971 49.7.....2005

 41.6.....1967 49.5.....2000

 42.2.....1951 49.2.....2004

 42.4.....1961 48.9.....1995

 42.5.....1987 48.8.....1958

 42.9.....1978 48.7.....1999/1981
28

DESERT HEAT STATISTICS

 90 DEGREE DAYS

 (AVG PER MONTH) MOST EVER LEAST EVER 

 (1981-2010) (1937-Date) (1937-Date)

 MAR......0.2 3...2004

 APR......3.1 14...1946 0...MANY TIMES

 MAY.....15.3 28...2009 3...1953

 JUN.....26.0 30...MANY TIMES 19...1998/1963

 JUL.....30.4 31...MANY TIMES 28...1984

 AUG.....30.0 31...MANY TIMES 24...1983

 SEP.....22.2 30...1979/1947 11...1986 

 OCT......4.1 19...1991 0...MANY TIMES 

 AVG 90 DEGREE DAYS PER YEAR....131.3 

 

NORMAL 90 DEGREE DAYS EXTEND FROM

......MAY 18TH TO SEP 26TH........

 

90 DEGREE DAYS IN A YEAR (1937-Date)

 MOST LEAST

158.....1940/1937 102.....1998

157.....1958/1943 110.....1982

111.....1983

 117.....1941

 100 DEGREE DAYS 

 (AVG PER MONTH) MOST EVER LEAST EVER

 (1981-2010) (1937-Date) (1937-Date)

 MAY......2.9 14...1947 0...MANY TIMES

 JUN.....14.6 25...1974 1...1965

 JUL.....24.5 31...2010 (MOST RECENT) 15...1999

 AUG.....21.4 31...1985 (MOST RECENT) 14...1984 (MOST RECENT)

 SEP......6.3 22...1943 0...1972 (MOST RECENT)

 OCT......0.0 2...1980 0...MANY TIMES

 AVG 100 DEGREE DAYS PER YEAR.....69.7

 

 

NORMAL 100 DEGREE DAYS EXTEND FROM

.......JUN 18TH TO AUG 30TH........

 

 

 100 DEGREE DAYS IN A YEAR (1937-TO DATE)

 MOST LEAST

 100.....1947 44.....1965

 95.....1948/1946 55.....1992/1941

 
29

DESERT HEAT STATISTICS (CONT)

 

 105 DEGREE DAYS* MOST EVER LEAST EVER

 (AVG PER MONTH) (1937-Date) (1937-Date)

 (1981-2010)

 MAY.....0.6 MAY....4/1947 MAY....0 (NMRS TIMES) 

 JUN.....7.6 JUN...17/1985/1940 JUN....0/1969/1965

 JUL....16.3 JUL...28/1942 JUL....5/1955

 AUG....11.0 AUG...23/1969 AUG....1/1968

 SEP.....1.2 SEP...11/1948/1945 SEP....0 (NMRS TIMES)

 AVG 105 DEGREE DAYS PER YEAR....36.8

 MAXIMUM.....61 IN 1940

 110 DEGREE DAYS* MOST EVER LEAST EVER

 (AVG PER MONTH) (1937-Date) (1937-Date)

 (1981-2010)

 JUN.....1.2 JUN...10/1961/1940 SEVERAL YEARS

 JUL.....4.8 JUL...17/1942 NEVER REACHED

 AUG.....1.5 AUG...10/1937

 SEP.....0.0 SEP....3/1947

 AVG 110 DEGREE DAYS YEAR.....7.5 

 MAXIMUM.....29 IN 1940

 115 DEGREE DAYS* MOST EVER AVG HOTTEST HIGH FOR THE SUMMER*

 (AVG PER MONTH) (1937-Date) (JUN-SEP) (1981-2010)

 (1981-2010)

 JUN.....0.1 JUN....3/1994/1940 .....113.....

 JUL.....0.5 JUL....5/2005

 AUG.....0.0 AUG....3/1979

 AVG 115 DEGREE DAYS PER YEAR.....0.6

 MAXIMUM......5 IN 2005/1940

 HIGHEST AVERAGE

 AVG HOTTEST HIGH (BY MONTH)* DAILY TEMPERATURE

 (1981-2010) (1937-Date) 

 JAN.....68 JUL....112 106....7/19/2005

 FEB.....75 AUG....110 105....7/17/2005

 MAR.....84 SEP....105 104....7/18/2005

 APR.....93 OCT.....94 103....7/19/2010

 MAY....101 NOV.....80 102....7/18/2010*

 JUN....109 DEC.....67 

*occurred other years

 *AVERAGES NOT CALCULATED BY NCDC.
30

 DESERT HEAT STATISTICS (CONT)

(1937-Date)

CONSECUTIVE DAYS 90 DEGREES OR HOTTER

118.....5/07-9/01/1940

114.....5/29-9/19/1956

109.....5/26-9/11/1994

CONSECUTIVE DAYS 100 DEGREES OR HOTTER

66......6/27-8/31/1944

46......6/20-8/04/1988

45......7/01-8/14/1971

45......6/23-8/06/2010

CONSECUTIVE DAYS 105 DEGREES OR HOTTER

21......7/18-8/07/2000

21......7/25-8/14/1977

21......6/22-7/12/1973

CONSECUTIVE DAYS 110 DEGREES OR HOTTER

10.....6/17-6/26/1961

9......7/01-7/09/2007

9......7/12-7/20/2005*

CONSECUTIVE DAYS 115 DEGREES OR HOTTER

4......7/16-7/19/2005

3......6/28-6/30/1994

3......6/30-7/02/1950*

 EARLIEST DAY WITH READING LATEST DATE OF LAST... 

 80 OR HIGHER.....2/01/2003 80 OR HIGHER.....11/24/1949

 90 OR HIGHER.....3/13/2007 90 OR HIGHER.....10/29/1950/1937

100 OR HIGHER.....5/01/1947 100 OR HIGHER.....10/04/1947

110 OR HIGHER.....6/06/2010 110 OR HIGHER.....(SEVERAL YEARS

115 OR HIGHER.....6/14/1940 115 OR HIGHER.....NEVER OCCURRED)

 LATEST DATE OF FIRST EARLIEST IN SEASON TO END WITH 

 

 80 OR HIGHER.....4/23/1941 80 OR HIGHER.....10/10/1957

 90 OR HIGHER.....5/21/1993 90 OR HIGHER.....9/13/1986

100 OR HIGHER.....6/30/1965 100 OR HIGHER.....8/28/1961 

110 OR HIGHER.....(SEVERAL YEARS 110 OR HIGHER.....(SEVERAL YEARS

115 OR HIGHER.....NEVER REACHED) 115 OR HIGHER.....NEVER REACHED)

AVERAGE DATE OF FIRST

(Average is from 1981-2010)

 

80.....MARCH 16 

90.....APRIL 18

100.....MAY 26

105.....JUNE 6 

110.....JULY 2

115.....JULY 10
31

FROST/FREEZE DATA

 CONSECUTIVE DAYS WITH LOWS 32 OR LESS HIGHS LESS THAN OR EQUAL TO 32

(1937-Date) (1937-Date)

 32.....1/03-2/03/1947 JAN.......5/1937

 25.....12/28/1948-1/21/1949 FEB-NOV...NEVER OCCURED

 22.....12/07-28/1937 DEC.......1/1972

 22.....1/07-28/1947

AVERAGE LOWS LESS THAN OR EQUAL TO MOST LOWS AT OR BELOW FREEZING 

 32...BY MONTH (1981-2010) (1937-TO DATE)

 JAN......3.0 JAN......30 IN 1949/1947

 FEB......1.1 FEB......23 IN 1939

 MAR......0.* (ONCE IN 30 YEARS) MAR......12 IN 1948

APR......0.0 APR.......2 IN 1945

 MAY-SEP..NEVER OCCURED MAY-SEP...NEVER OCCURRED

 OCT......0.0 OCT.......3 IN 1971

 NOV......0.4 NOV......21 IN 1938

 DEC......3.0 DEC......25 IN 1948

 AVERAGE...7.5

 EARLIEST DATE WITH READING OF LATEST DATE IN SPRING WITH

 (1937-TO DATE) (1937-TO DATE)

 32 OR LESS.....10/21/1949 32 OR LESS.....4/12/1967

 28 OR LESS.....10/30/1971 28 OR LESS.....3/31/1938 

 24 OR LESS.....11/07/1938 24 OR LESS.....3/06/1939

 AVG DATE OF FIRST FREEZE* AVG DATE OF LAST FREEZE*

 .............12/3................... .............2/5................

SHORTEST FREEZE FREE PERIOD....202 DAYS (4/6/45-10/24/45)

 AVERAGE FREEZE FREE PERIOD.....269 DAYS

 LONGEST FREEZE FREE PERIOD.....367 DAYS (12/17/94-12/18/95)

 LATEST DATE IN FALL/WINTER EARLIEST IN WINTER/SPRING 

 OF FIRST READING SEASON FOR LAST READING

 32 OR LESS.....12/19/1995 and 2002 32 OR LESS....12/16/94

 28 OR LESS.....NONE NUMEROUS YEARS 28 OR LESS.....NONE NUMEROUS YEARS

24 OR LESS.....NONE NUMEROUS YEARS 24 OR LESS.....NONE NUMEROUS YEARS

 

 

 AVG COLDEST LOW (BY MONTH)* AVG COLDEST LOW FOR THE WINTER

 (1981-2010) (DEC-FEB) (1981-2010*)

 JAN.....28 .....28..... 

 FEB.....29

 MAR.....37

 APR.....44

 MAY.....52

 JUN.....60

 JUL.....73

AUG.....69

 SEP.....58

 OCT.....46

 NOV.....34

 DEC.....27 *AVERAGES NOT CALCULATED BY NCDC.
32

THUNDERSTORM DAYS

 AVERAGE PER MONTH* MOST EVER BY MONTH

 (1981-2010) (1937-TO DATE)

 JAN.....0.0 JAN.....1...1979/1946

 FEB.....0.4 FEB.....2...2005/2000/1941

 MAR.....0.4 MAR.....4...1992

 APR.....0.4 APR.....4...1941

 MAY.....0.7 MAY.....4...1992/1965 

 JUN.....1.3 JUN.....6...1972

 JUL.....3.0 JUL.....9...1955/1950/1937

 AUG.....3.3 AUG....13...2012

 SEP.....1.5 SEP.....7...2011

 OCT.....0.7 OCT.....6...2010

 NOV.....0.2 NOV.....2...1959

 DEC.....0.1 DEC.....2...1940

 

 ANNUAL AVG.....11.7*

 *NOT CALCULATED BY NCDC.

 

MOST THUNDERSTORM DAYS IN A MONSOON SEASON

JUNE-SEPTEMBER (1937-TO DATE)

 22......1955

 21......1938

20......2012/1984/1967/1961

19......1998

18......1972

LEAST THUNDERSTORM DAYS IN A MONSOON SEASON

JUNE-SEPTEMBER (1937-DATE)

 0......1944

2......1992

3......1948

4......1985/1943

THUNDERSTORM DAYS IN A CALENDAR YEAR

(1937-DATE)

 MOST LEAST

 26......1938 4......1944

24......2012/1955 6......1989/1985/1943

 23......1998/1946 7......1991/1962/1948

 22......1972/1961 8......2002/1995/1994/1993/1978 

Dew Point Records

Highest recorded hourly dew point in Las Vegas occurred 8/14/1984 and 9/8/2004: 

75 degrees

Largest dew point depression occurred June 27, 2011: 129 degrees 107F/-22F
33

HAIL DAYS

 

 

 AVG PER MONTH* MOST EVER BY MONTH 

 (1981-2010) (1937-DATE)

 JAN.....0.0 JAN.....0

 FEB.....** FEB.....1...2004/1970

 MAR.....0.1 MAR.....2...1992

 APR.....0.0 APR.....0

 MAY.....0.0 MAY.....1...1979/1975/1973

 JUN.....0.0 JUN.....1...1970/1969/1967/1955

 JUL.....0.0 JUL.....1...1960

 AUG.....0.1 AUG.....1...2004/1989

 SEP.....** SEP.....1...1983/1972

 OCT.....0.0 OCT.....1...2012

 NOV.....0.0 NOV.....0

 DEC.....0.0 DEC.....1...1939

ANNUAL AVG*.....0.2

 *NOT CALCULATED BY NCDC.

 **HAPPENED ONCE IN 30 YEARS.

MOST HAIL DAYS IN MONSOON SEASON 

JUNE-SEPTEMBER (1937-DATE)

1.....SEVERAL OCCASIONS
34

WIND NORMALS...MEANS AND EXTREMES*

NCDC 27 YEAR MEAN

(1984-2010)

JAN........WSW 6.9

FEB........WSW 7.9

MAR.........SW 9.5

APR.........SW 10.5

MAY........SSW 10.5

JUN........SSW 10.5

JUL..........S 9.4

AUG..........S 9.0

SEP.........SW 8.3

OCT........WSW 7.6

NOV........WSW 7.2

DEC........WSW 6.8

 ANN..........S 8.7

ALL TIME WINDIEST MONTHS

(1949-TO DATE)

JAN....11.2...1982

FEB....11.3...1986

MAR....13.8...1984

APR....14.4...1957

MAY....13.7...1955

JUN....14.5...1958

JUL....13.3...1963

AUG....13.6...1954

SEP....12.3...1986

OCT....10.5...1975

NOV....10.8...1983

DEC....10.1...1988

PEAK GUSTS BY MONTH IN MPH

(1949-Date)

JAN.......WSW 58......1/24/1965

FEB........NW 73......2/19/1976

MAR........NW 82......3/21/1984

APR.........W 69......4/30/1988

MAY........NW 73......5/30/1991

JUN.......NNW 67......6/07/1964

JUL.........S 75......7/14/1971

AUG........SE 90......8/08/1989

SEP........SE 73......9/04/1980

OCT........SW 71......10/23/1956

NOV.........S 70......11/20/1983

DEC.........W 68......12/05/1951

*PREVAILING WIND DIRECTION TO NEAREST CARDINAL COMPASS POINT.

 WIND NORMAL...MEANS AND EXTREMES ARE IN MILES PER HOUR. 
35

10 WINDIEST MONTHS BY MONTH (MPH)

(1949-Date)

 JAN FEB

 11.2.....1982 11.3.....1986

 9.5.....1980 11.0.....1955

 9.3.....1957 10.9.....1956

 9.2.....1989 10.7.....1989

 8.9.....1975/1973/1962 10.3.....1990/1960

 8.8.....1987 10.2.....1984/1962

 8.3.....1997/1990/1965 9.9.....1977/1964

 MAR APR

13.8.....1984 14.4.....1957

13.5.....1977 13.9.....1963

13.1.....1985 13.8.....1955

13.0.....1989/1975 13.4.....1983

12.3.....1954 13.3.....1986

12.0.....1982 12.8.....1972

11.9.....1957 12.7.....1984/1973

11.5.....1983 12.6.....1964

11.3.....1986/1976 12.3.....1956

 MAY JUN

13.7.....1955 14.5.....1958

13.6.....1956 13.6.....1980 

 13.4.....1990/1989 13.4.....1963

 13.1.....1985 13.3.....1978/1954 

 12.9.....1998 12.8.....1989

 12.7.....1962 12.7.....1990/1976

 12.6.....1957 12.6.....1956

 12.5.....1963/1961/1959 12.4.....1997/1981

 JUL AUG

 13.3.....1963 13.6.....1954

 12.8.....1983/1958 12.1.....1957

 12.6.....1981 12.0.....1962

 12.5.....1955 11.8.....1976

 12.3.....1972 11.7.....1989/1956

 12.2.....1989 11.4.....1985

 12.1.....1957 11.3.....2010/1995/1960

 11.8.....1988 10.7.....1963

 11.7.....1977 10.5.....2011 MOST RECENTLY
36

10 WINDIEST MONTHS BY MONTH (CONT)

 SEP OCT

 12.3.....1986 10.5.....1975

 12.0.....1954 10.4.....1956

 11.1.....1989 10.2.....1981/1973

 11.0.....1985/1955 10.0.....1984/1961

 10.7.....1977 9.9.....1989

 10.3.....1956 9.7.....1962

 10.2.....1964 9.3.....1979

 10.0.....1963 9.1.....1985

 9.8.....1981

 NOV DEC

 10.8.....1983 10.1.....1988

 10.4.....1973 9.5.....1982

 10.1.....1994/1988 9.1.....1972

 10.0.....1985 8.8.....1987

 9.9.....1975 8.6.....1975/1967/1959

 9.3.....1964 8.5.....1997/1971

 9.1.....2010 8.4.....1998
37

HEATING/COOLING DEGREE DAYS

 

NORMALS (1981-2010)

HDD/CDD

 JAN.....505/0 

 FEB.....339/1 

 MAR.....189/30 

 APR......63/129 

 MAY.......7/390 

 JUN.......1/650 

 JUL.......0/854 

 AUG.......0/795 

 SEP.......1/528 

 OCT......38/179 

 NOV.....270/12 

 DEC.....538/0

 

 

ANNUAL HDD...1951 

 CDD...3568 

 

 

 MOST/LEAST CDD (1937-TO DATE) MOST/LEAST HDD (1937-TO DATE)

 JAN......NEVER OCCURRED JAN.....1040...1937 

 331...2003

 FEB.......20...1986 FEB......658...1939

 0...NUMEROUS YEARS 170...1995

 MAR......124...2004 MAR......447...1952

 0...SEVERAL YEARS 71...2004

 APR......259...1989 APR......261...1967

 2...1975 7...1992

 MAY......583...2009 MAY.......72...1964

 108...1953 0...MANY TIMES

 JUN......772...2006 JUN........8...1993

 387...1944 0...MANY TIMES

 JUL......976...2010 JUL......NEVER OCCURED

 685...1987

 AUG......904...2011 AUG......NEVER OCCURED

 566...1941

 SEP......641...2009 SEP.......15...1965

 252...1941 0...MANY TIMES

 OCT......335...2003 OCT......207...1971

 16...1946 0...2001/1988/1944

 NOV.......32...2007 NOV......563...1938

 0...NUMEROUS YEARS 131...2008

 DEC......NEVER OCCURRED DEC......761...1990

 374...1980
38

SNOW (1937-PRESENT)***

 NORMALS (1981-2010) MOST EVER BY MONTH (1937-PRESENT)* 

 

 JAN.....0.* 16.7.....JAN/1949 

 FEB.....0.1 4.1.....FEB/1939

 MAR.....0.0 0.1.....MAR/1976

 APR.....0.0 TRACE.....APR/1958

 MAY.....0.0 0.0 

 JUN.....0.0 0.0

 JUL.....0.0 0.0

 AUG.....0.0 0.0

 SEP.....0.0 0.0 

 OCT.....0.0 TRACE.....OCT/1956

 NOV.....0.* 4.0.....NOV/1964

 DEC.....0.2 3.6.....DEC/2008

 * LESS THAN 0.1 

 ANNUAL AVERAGE.....0.3 * DOES NOT COUNT HAIL.

 MOST SNOW IN 24 HOURS

 9.0.....1/4-5/1974

 7.5.....1/30-31/1979

 5.0.....1/11-12/1949

 4.7.....1/25/1949

 4.4.....1/1/1974

 4.1.....2/3-4/1939

 4.0.....11/15-16/1964 

 3.6.....12/17/2008

 GREATEST SNOW DEPTHS (INCHES) MOST SNOW IN A SEASON

 8.....1/5/1974 16.7....1948/49

 7.....1/12/1949 13.4....1973/74

 6.....1/31/1979 10.2....1978/79

4.1....1938/39

 BIGGEST SNOW STORMS 4.0....1964/65

 9.7.....1/10-12/1949 

 9.0.....1/4-5/1974 CONSECUTIVE SNOW DAYS

 7.8.....1/30-2/2/1979 (TRACE OR MORE) 

 4.7.....1/25/1949 5......1/9-13/1949

 4.4.....1/1/1974 5......1/4-8/1974

 4.1.....2/3-4/1939 

 4.0.....11/15-16/1964

 3.6.....12/17/2008 CONSECUTIVE SNOW DAYS 

 2.4.....1/28/1979 MEASURABLE)

 2.3.....1/19-20/1949 3......1/11-13/1949

 2.0.....12/15/1967 3......1/30-2/1/1979

 

 EARLIEST SNOW EVER (Trace or Measurable)

 11/15/1964.....3.0" (1" more on the 16th)

 LATEST SNOW EVER

 Trace..........4/4/58

 Measurable.....3/3/76.....0.1"

***Starting in February 1996...snowfall and snow depth measurements were no longer

officially recorded at McCarran International Airport. 
39

NORMAL SUNSHINE

(1971-1995)

(PERCENT OF POSSIBLE)

JAN.....77

FEB.....81

MAR.....83

APR.....87

MAY.....88

JUN.....93

JUL.....88

AUG.....88

SEP.....91

OCT.....87

NOV.....81

DEC.....78

ANNUAL AVG.....85
40

SUNSHINE (CONT)

SUNNIEST MONTHS ALL TIME 

(PERCENT OF POSSIBLE, 1941-2002)

 

 JAN FEB 

 

95.....1984/1976 94.....1984 

92.....1972 93.....1964/1954

91.....1971 92.....1974/1972/1956

 MAR APR

97.....1972 97.....1974

96.....1988/1953 96.....1981/1969

95.....1956/1990/1997/2002 94.....1989/1966

 

 MAY JUN

98.....1984 99.....1942

95.....1976/1970/1952 98.....1952/58/71/74/96

 JUL AUG

 99.....1993 98.....1976/1985 

96.....1995/1983/1963/48 97.....1980/1956/1952

95.....1972/1971/1958 95.....1978/1966

 SEP OCT

100.....1970/1942 96.....1976/1967

99......1955 95.....1980/1973

 98......1993 93.....1991/1989/1964/1954

 NOV DEC

 98.....1956 96.....1976

 96.....1988 94.....1963/1988

 95.....1976 93.....1998/1995

 

 ALL TIME SUNNIEST YEARS

 (IN PERCENTAGE OF POSSIBLE)

 93.....1976 

92.....1989

91.....1956
41

CLOUDIEST MONTHS AND YEARS

(IN PERCENTAGE OF POSSIBLE SUNSHINE, 1941-2002)

 JAN FEB

45.....1995 55.....1998

53.....1979 58.....1941

54.....1978 61.....1983

 MAR APR

64.....1958 67.....1947

67.....1946 72.....1944

68.....1943 73.....1965/1946

 MAY JUN

63.....1946 78.....1947

71.....1947 80.....1977

 72.....1977 84.....1965

 JUL AUG 

 

73.....1946 74.....1955 

75.....1984 75.....1946

76.....1954 76.....1982

 

 SEP OCT

75.....1963 55.....1972 

78.....1967 69.....1941

79.....1989/1946 70.....1987

 

 NOV DEC

56.....1946 44.....1946

69.....1982 56.....1941

70.....1972 61.....1983

ALL TIME CLOUDIEST YEARS

(IN PERCENTAGE OF POSSIBLE SUNSHINE)

(1941-2002)

72.....1946

77.....1947

78.....1957
42

RELATIVE HUMIDITY

AVERAGE RELATIVE HUMIDITY (IN PERCENTAGE)

(1971-2000)

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

LOCAL TIME

 

HOUR 04 57 52 47 35 33 24 28 33 34 38 45 52 40

HOUR 10 43 38 32 23 20 15 20 23 23 26 32 38 28

HOUR 16 33 28 24 17 15 11 15 18 18 20 26 31 21

HOUR 22 51 45 39 27 24 17 21 25 26 30 39 46 32
43

FOG

NCDC MEAN FOR DENSE FOG (VISIBILITIES 1/4 MILES OR LESS)

(1949-2010)

 JAN..........0.3

 FEB..........0.1

 MAR..........0.1

 APR..........0.0

 MAY..........0.0

 JUN..........0.0

 JUL..........0.0

 AUG..........0.0

 SEP..........0.*

 OCT..........0.0

 NOV..........0.* 

 DEC..........0.1

 ANNUAL AVG...0.6

 * OCCURRED ONCE IN 30 YEARS

NORMAL FOG DAYS** FOGGIEST MONTHS

 (1981-2010) (1971 TO DATE)

 JAN.....1.0 JAN.....7 IN 1993

 FEB.....0.8 FEB.....5 IN 1980

 MAR.....0.3 MAR.....3 IN 1992/1981

 APR.....0.1 APR.....2 IN 1988

 MAY.....0.* MAY.....1 IN 1987/1977

 JUN.....0.0 JUN.....0

 JUL.....0.1 JUL.....1 IN 1999/1996/1984

 AUG.....0.1 AUG.....1 IN 2000/1983/1979

 SEP.....0.1 SEP.....1 IN 1998/1983

 OCT.....0.1 OCT.....1 IN 1998/1992/1987/1978

 NOV.....0.4 NOV.....3 IN 1987

 DEC.....0.8 DEC.....5 IN 1984

 ANNUAL AVG.....3.8

 *OCCURRED ONCE IN 30 YEARS

 ** NOT CALCULATED BY NCDC. 
44

 PRESSURE

ALL TIME HIGHEST (BY MONTH) ALL TIME LOWEST (BY MONTH)

 (1937-Date) (1937-Date)

JAN.....30.76...01/1979 JAN.....29.03...21/2010

FEB.....30.67...10/2002 FEB.....29.31...23/1987

MAR.....30.61...02/1971 MAR.....29.25...26/1984

APR.....30.39...03/1963 & 01/1971 APR.....29.24...30/1954

MAY.....30.34...07/1984 MAY.....29.23...22/2008

JUN.....30.24...15/1981 JUN.....29.18...21/1947

JUL.....30.18...21/1988 JUL.....29.40...02/1999

AUG.....30.18...11/1981 AUG.....29.41...28/2010

SEP.....30.29...25/1970 SEP.....29.31...21/2000

OCT.....30.55...31/1981 OCT.....29.34...04/2009

NOV.....30.72...18/1969 NOV.....29.18...30/1982

DEC.....30.80...22/1967 DEC.....29.17...10/1949

 ALL TIME HIGHEST.....30.80...12/22/1967

ALL TIME LOWEST......29.03...01/21/2010
45

HOLIDAY WEATHER

(1937-TO DATE)

 NEW YEAR HOLIDAY (JANUARY 1ST)

 NORMAL HIGH/LOW.....56/38

 RECORD HIGH.....69 IN 1981

 RECORD LOW......21 IN 1954

 MOST SNOW EVER.......4.4 INCHES IN 1974

 MOST PRECIPITATION...0.43 IN 1974

 DAYS OF MEASURABLE PRECIPITATION.....2

 DAYS WITH ANY PRECIPITATION..........4

 VALENTINE’S DAY

 

 NORMAL HIGH/LOW.....62/43

 RECORD HIGH.....78 IN 1957

 RECORD LOW......18 IN 1949

 MOST SNOW EVER.......0.0 INCHES

 MOST PRECIPITATION...0.74 IN 1980

 DAYS OF MEASURABLE PRECIPITATION.....8

 DAYS WITH ANY PRECIPITATION..........17

 MEMORIAL DAY 

 AVERAGE HIGH/LOW*.....92/64

 RECORD HIGH.....108 IN 1974

 RECORD LOW.......48 IN 1942

 MOST PRECIPITATION EVER.....0.03 IN 1944/1945

 DAYS OF MEASURABLE PRECIPITATION.....2

 DAYS WITH ANY RAIN...................5

 4TH OF JULY

 NORMAL HIGH/LOW.....104/80

 RECORD HIGH.....115 IN 1985

 RECORD LOW.......60 IN 1941

 MOST PRECIPITATION EVER.....0.16 IN 1949

 DAYS OF MEASURABLE PRECIPITATION.....2

 DAYS WITH ANY RAIN...................5

 LABOR DAY 

 AVERAGE HIGH/LOW*.....100/70

 RECORD HIGH.....111 IN 1947

 RECORD LOW.......54 IN 1943

 MOST PRECIPITATION EVER.....0.70 IN 1997
46

HOLIDAY WEATHER (CONT)

 LABOR DAY (CONT)

 DAYS OF MEASURABLE PRECIPITATION.....5

 DAYS WITH ANY RAIN...................9

 HALLOWEEN

 NORMAL HIGH.....74/53

 RECORD HIGH.....86 IN 1988

 RECORD LOW......30 IN 1971

 MOST PRECIPITATION EVER.....0.25 IN 1987

 DAYS OF MEASURABLE PRECIPITATION.....6

 DAYS WITH ANY RAIN...................7

 

 THANKSGIVING (FLEXIBLE DATE)

 AVERAGE HIGH/LOW*.....63/38

 RECORD HIGH.....81 IN 1949

 RECORD LOW......15 IN 1938

 MOST PRECIPITATION EVER.....0.74 IN 1984

 

 DAYS WITH MEASURABLE PRECIPITATION.....2

 DAYS WITH ANY PRECIPITATION............8

 CHRISTMAS

 NORMAL HIGH/LOW.....56/38

 RECORD HIGH.....69 IN 1964

 RECORD LOW......17 IN 1948

 MOST PRECIPITATION EVER.....0.66 IN 1994

 MOST SNOW EVER.....TRACE IN 2008...1988...1941

 DAYS WITH MEASURABLE PRECIPITATION.....8

 DAYS WITH ANY RAIN OR SNOW.............12

 

 *BASED ON PERIOD OF RECORD.
47

ACKNOWLEDGMENTS

We would like to thank the staff at NWSO Las Vegas for their encouragement and help 

during this project. I would like to also thank MIC Kim Runk and Stanley Czyzyk, SOO, 

for their review, comments, and guidance on completing this Technical Memorandum. 

We would like to thank all the observers down through WSO Las Vegas' existence. It is 

fascinating looking back at our historical database to see how detailed the records 

were 60 or more years ago.
48

Las Vegas, NV

Figure 1. Record Maximum/Minimum Temperature in Las Vegas.

 (1937-1948 at Nellis) (1949-Date at McCarran).

77

8

87

16

92

19

99

31

109

38

116

48

117

56

116

54

113

43

103

26

87

15

78

11

0

20

40

60

80

100

120

Degrees Fahrenheit

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Record Max/Min Temperature

Record Max Record Min
49

0

2

4

6

8

10

12 Inches 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

ANNUAL PRECIPITATION AT LAS VEGAS

 1937-2010

Figure 2. Annual Precipitation (in inches) at Las Vegas, NV 

(1937-1948 at Nellis) (1949-Present at McCarran).
50

57

52

47

35

33

24

28

33

34

38

45

52

33

28

24

17 15

11

15 17 18 20

26

31

0

10

20

30

40

50

60

Percent

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Average RH

RH @ 4 P.M. RH @ 4 A.M.

Figure 3. Average Relative Humidity at 4:00 a.m. and 4:00 p.m. PST 

 for McCarran International Airport, Las Vegas, NV 

 (1971-2000).

 
51

0.0

0.4 0.4 0.4

0.7

1.3

3.0

3.3

1.5

0.7

0.2 0.1

0

1

2

3

4

5

6

7

8

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Average Number of Thunderstorm Days

Las Vegas, NV

Figure 4. Average Number of Thunderstorm Days for McCarran 

International Airport, Las Vegas, NV.
52

0 0 0

4

16

26

30 30

23

5

0 0

0 0 0 0

3

16

25

23

7

0 0 0

0 0 0 0 0 1

5

1 0 0 0 0

0

5

10

15

20

25

30

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Avg 90/100/110 Degree Days

Days GTE 110 Days GTE 100 Days GTE 90

Las Vegas, NV

Figure 5. Average number of 90 and 100 degree days at McCarran

 International Airport, Las Vegas, NV (1981-2010).
53

3.00 2.89

4.80

2.44

0.96 0.97

2.48 2.59

3.39

1.45

2.22 2.10

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5 Inches

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Monthly Precipitation Extremes

Monthly Precipitation Extremes

Las Vegas, NV

Figure 6. Monthly Precipitation Extremes for Las Vegas. 

 (1937-1948 at Nellis) (1949-Date at McCarran).
54

Las Vegas, NV

Figure 7. Peak Wind Gusts per Month recorded at McCarran

 International Airport, Las Vegas, NV.

58

73

82

69

73

67

75

90

73 71 70 68

0

10

20

30

40

50

60

70

80

90

MPH

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Record Monthly Peak Wind Gust

Wind Gusts
55

Figure 8. Average yearly Las Vegas temperature by decade recorded

 at McCarran International Airport.

Figure 9. Population of Clark County, NV. 

65.7

66.3 66.1

66.6

67.5

68.2

69.9

63

64

65

66

67

68

69

70

Degrees (F)

1940's 1950's 1960's 1970's 1980's 1990's 2000's

Average Las Vegas Temperature by Decade

Average Temperature by Decade

16,414 48,289 127,016

273,288

463,087

741,459

1,375,765

2,036,358

0

500,000

1,000,000

1,500,000

2,000,000

2,500,000

1940 1950 1960 1970 1980 1990 2000 2010

Clark County Nevada Population

Clark County, NV Population
56

Figure 10. Average yearly Las Vegas minimum temperature by decade

 recorded at McCarran International Airport.

81.3

80.2

79.2

79.7 79.9 79.9

80.7

74

75

76

77

78

79

80

81

82

83

84

Degrees (F)

1940's 1950's 1960's 1970's 1980's 1990's 2000's

Average Las Vegas Maximum Temperature by 

Decade

Average Maximum Temperature by Decade

Figure 11. Average yearly Las Vegas maximum temperature by decade 

recorded at McCarran International Airport. 

50.3

52.2 52.7 53.3

54.9

56.4

59.1

44

46

48

50

52

54

56

58

60

Degrees (F)

1940's 1950's 1960's 1970's 1980's 1990's 2000's

Average Las Vegas Minimum Temperature by 

Decade

Average Minimum Temperature by Decade
57

Figure 12. Normal Monthly Las Vegas Precipitation (1981-2010). 

 Official readings taken at McCarran International 

 Airport.

0.54

0.76

0.44

0.15

0.12

0.07

0.40

0.33

0.25

0.27

0.36

0.50

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8 Inches

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Las Vegas Normal Monthly 

Precipitation

Precipitation