086
CXUS55 KRIW 011729
CLMGEY
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1107 AM MDT TUE SEP 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR GREYBULL 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
..GREYBULL IN AUGUST WAS DRIER AND WARMER THAN NORMAL.
THE AVERAGE TEMPERATURE FOR GREYBULL IN AUGUST WAS 72.8 DEGREES
WHICH IS 0.5 DEGREES ABOVE NORMAL. THE WARMEST TEMPERATURE FOR THE
MONTH WAS 105 DEGREES ON THE 1ST. THIS BROKE THE 2008 RECORD OF 104.
THIS ALSO TIED THE ALL-TIME AUGUST HIGH TEMPERATURE. THE COLDEST
TEMPERATURE WAS 42 DEGREES ON THE 31ST. THE LOW OF 49 ON THE 5TH
TIED 2012.
PRECIPITATION FOR THE MONTH WAS 0.18 INCHES...WHICH IS 78 PERCENT OF
NORMAL. THE WETTEST 24-HOUR PERIOD HAD 0.08 INCHES ON THE 14TH. THE
17TH HAD 0.02 INCHES AND TIED 2003. THE HIGHEST WIND GUST WAS 55
MPH. IT OCCURRED ON THE 23RD FROM THE NORTHWEST.
..THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2026
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
RECORD
HIGH 105 08/12/2018
08/03/2001
07/16/2005
LOW 36 08/31/2005
HIGHEST 105R 08/01
LOWEST 42 08/31
AVG. MAXIMUM 89.3 88.8 0.5
AVG. MINIMUM 56.3 55.8 0.5
MEAN 72.8 72.3 0.5
DAYS MAX >= 90 16
DAYS MAX <= 32 0
DAYS MIN <= 32 0
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 1.29 2022
MINIMUM T 2013
TOTALS 0.18 0.23 -0.05 0.17
DAILY AVG. 0.01 0.01 0.00
DAYS >= .01 5
DAYS >= .10 0
DAYS >= .50 0
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.08 08/14 TO 08/14
STORM TOTAL 0.08
DEGREE DAYS
HEATING TOTAL 2 15 -13
SINCE 7/1 2 16 -14
COOLING TOTAL 252 241 11
SINCE 1/1 798 696 102
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 5.8
RESULTANT WIND SPEED/DIRECTION 1/330
HIGHEST WIND SPEED/DIRECTION 41/330 DATE 08/23
HIGHEST GUST SPEED/DIRECTION 55/330 DATE 08/23
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.12
NUMBER OF DAYS FAIR 25
NUMBER OF DAYS PC 4
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 44
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 4 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 1
LIGHT RAIN 10 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 1 FOG W/VIS <= 1/4 MILE 0
HAZE 7
- 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 84 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 51 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 69
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 40 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 0.83 INCHES.
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