801
CXUS55 KRIW 011725
CLMCPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1107 AM MDT TUE SEP 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR CASPER FOR THE MONTH OF
AUGUST 2026...
...OFFICIAL CLIMATE DATA FOR THE MONTH OF AUGUST 2026 WILL BE
AVAILABLE IN APPROXIMATELY 60 DAYS FROM THE NATIONAL CENTERS FOR
ENVIRONMENTAL INFORMATION (HTTP://WWW.NCDC.NOAA.GOV/CDO-
WEB/DATASETS). UNOFFICIAL ASOS DAILY SUMMARIES ARE AVAILABLE ON THE
INTERNET AT HTTP://WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW
..CASPER WAS WARMER AND WETTER THAN NORMAL IN AUGUST
AVERAGE TEMPERATURE FOR CASPER IN AUGUST WAS 71.5 DEGREES WHICH IS
2.5 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH WAS 103
DEGREES ON THE 2ND AND BROKE 99 FROM 2000. THIS ALSO SET A NEW ALL-
TIME HIGH FOR AUGUST. PREVIOUSLY IT WAS 102 DEGREES SET AUGUST 5TH
1979. THE 1ST HIT 99 DEGREES AND TIED 2008. THE 8TH HIT 99 AND BROKE
98 FROM 1983 AND 2001. THE 21ST HIGH OF 99 BROKE 96 FROM 2024. THE
COLDEST READING FOR THE MONTH WAS 44 DEGREES ON THE 5TH.
TOTAL PRECIPITATION FOR THE MONTH WAS 2.01 INCHES...WHICH IS 254
PERCENT OF NORMAL. IT WAS THE 5TH WETTEST AUGUST ON RECORD. THE
WETTEST 24-HOUR PERIOD DURING THE MONTH WAS ON THE 13TH WITH 1.26
INCHES. THIS BROKE THE 1990 RECORD OF 0.64. THE 15TH HAD 0.58 INCHES
AND BROKE THE 2009 RECORD OF 0.46. THE HIGHEST WIND GUST WAS 78 MPH
FROM THE SOUTHWEST ON THE 10TH.
..THE CASPER WY CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2026
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1939 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
RECORD
HIGH 103 08/02/2026
LOW 29 08/23/2015
HIGHEST 103R 08/02
LOWEST 44 08/05
AVG. MAXIMUM 88.6 86.7 1.9
AVG. MINIMUM 54.4 51.4 3.0
MEAN 71.5 69.0 2.5
DAYS MAX >= 90 14
DAYS MAX <= 32 0
DAYS MIN <= 32 0
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 2.79 1941
MINIMUM 0.02 1950
TOTALS 2.01 0.79 1.22 0.72
DAILY AVG. 0.06 0.03 0.03
DAYS >= .01 6
DAYS >= .10 3
DAYS >= .50 2
DAYS >= 1.00 1
GREATEST
24 HR. TOTAL 1.26 08/13 TO 08/13
STORM TOTAL 1.26
SNOWFALL (INCHES)
TOTALS 0.0 0.0 0.0
SINCE 7/1 0.0 0.0 0.0
SNOWDEPTH AVG. 0
DAYS >= 1.0 0
DEGREE DAYS
HEATING TOTAL 5 31 -26
SINCE 7/1 5 42 -37
COOLING TOTAL 215 157 58
SINCE 1/1 593 412 181
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 10.0
RESULTANT WIND SPEED/DIRECTION 3/270
HIGHEST WIND SPEED/DIRECTION 51/270 DATE 08/27
HIGHEST GUST SPEED/DIRECTION 78/210 DATE 08/10
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.11
NUMBER OF DAYS FAIR 29
NUMBER OF DAYS PC 1
NUMBER OF DAYS CLOUDY 1
AVERAGE RH (PERCENT) 46
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 10 MIXED PRECIP 0
HEAVY RAIN 2 RAIN 4
LIGHT RAIN 15 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 2 FOG W/VIS <= 1/4 MILE 0
HAZE 6
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
LOOKING AHEAD TO SEPTEMBER 2026. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 82 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 47 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 68
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 37. THE AVERAGE MONTHLY
PRECIPITATION IS 0.95 INCHES. THE AVERAGE SNOWFALL IS 1.5 INCHES.
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