688
CXUS55 KRIW 011736
CLMRIW
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1107 AM MDT TUE SEP 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON 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
..RIVERTON WAS WARMER AND WETTER THAN NORMAL IN AUGUST
THE AVERAGE TEMPERATURE FOR RIVERTON IN AUGUST WAS 72.7 DEGREES
WHICH WAS 3.1 DEGREES ABOVE NORMAL. IT WAS THE 5TH WARMEST AUGUST ON
RECORD. THE WARMEST READING FOR THE MONTH WAS 101 DEGREES ON THE 2ND
AND BROKE THE 2024 RECORD OF 97. IT ALSO SET A NEW RECORD FOR ALL-
TIME MONTHLY HIGH. PREVIOUS RECORD WAS 99 SET ON AUGUST 20TH 2025.
THE FIRST HIGH OF 100 BROKE 99 FROM 2008. THE 7TH HIT 97 AND BROKE
95 FROM 2025. THE 8TH HIGH OF 99 BROKE 94 FROM 2005. THE 9TH HIT 98
AND BROKE 94 FROM 2007. THE 21ST HIGH OF 98 BROKE THE 1010, 2023 AND
2024 RECORD OF 94. THE COLDEST READING WAS 47 DEGREES ON THE 4TH.
PRECIPITATION FOR THE MONTH WAS 0.68 INCHES...WHICH IS 162 PERCENT
OF NORMAL. THE WETTEST 24-HOURS WAS THE 24TH WHEN 0.36 INCHES FELL.
THIS BROKE THE 2016 RECORD OF 0.13. THE 13TH HAD 0.15 INCHES AND
BROKE 0.14 FROM 2024. THE HIGHEST WIND GUST WAS 58 MPH FROM THE
NORTHWEST ON THE 23RD.
..THE RIVERTON WY CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2026
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1995 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
RECORD
HIGH 101 08/02/2026
LOW 36 08/31/2020
HIGHEST 101R 08/02
LOWEST 47 08/04
AVG. MAXIMUM 87.8 85.5 2.3
AVG. MINIMUM 57.6 53.7 3.9
MEAN 72.7 69.6 3.1
DAYS MAX >= 90 13
DAYS MAX <= 32 0
DAYS MIN <= 32 0
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 1.36 2023
MINIMUM 0.01 2020
TOTALS 0.68 0.42 0.26 0.52
DAILY AVG. 0.02 0.01 0.01
DAYS >= .01 6
DAYS >= .10 2
DAYS >= .50 0
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.36 08/24 TO 08/24
STORM TOTAL 0.36
SNOWFALL (INCHES)
TOTALS 0.0 MM MM
SINCE 7/1 0.0 MM MM
SNOWDEPTH AVG. 0
DAYS >= 1.0 0
DEGREE DAYS
HEATING TOTAL 2 26 -24
SINCE 7/1 2 34 -32
COOLING TOTAL 250 169 81
SINCE 1/1 713 468 245
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 8.3
RESULTANT WIND SPEED/DIRECTION 3/340
HIGHEST WIND SPEED/DIRECTION 46/310 DATE 08/23
HIGHEST GUST SPEED/DIRECTION 58/310 DATE 08/23
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.09
NUMBER OF DAYS FAIR 30
NUMBER OF DAYS PC 1
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 40
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 5 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 2
LIGHT RAIN 14 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 4 FOG W/VIS <= 1/4 MILE 1
HAZE 5
- 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 81 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 50 DEGREES. THE AVERAGE HIGH AT THE END OF THE MONTH IS 66
DEGREES AND THE AVERAGE LOW TEMPERATURE IS 39. THE AVERAGE MONTHLY
PRECIPITATION IS 0.77 INCHES.
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