640
CXUS55 KRIW 011643
CLMGEY
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1032 AM MDT MON JUN 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR GREYBULL FOR THE MONTH OF
MAY 2026...
...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 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 MAY WAS DRIER AND WARMER THAN NORMAL.
THE AVERAGE TEMPERATURE FOR GREYBULL IN MAY WAS 58.1 DEGREES WHICH
IS 1.1 DEGREES ABOVE NORMAL. THE WARMEST TEMPERATURE FOR THE MONTH
WAS 96 DEGREES ON THE 13TH. THIS BROKE THE 2001 RECORD OF 94. THE
27TH HIT 89 DEGREES AND BROKE THE 2010 RECORD OF 87. THE COLDEST
TEMPERATURE WAS 25 DEGREES ON THE 6TH AND BROKE 28 FROM 2010. . THE
18TH LOW OF 35 BROKE 37 FROM 2024. THE LOW ON THE 19TH WAS 27
DEGREES AND BROKE THE 2003 RECORD OF 31.
PRECIPITATION FOR THE MONTH WAS 0.48 INCHES...WHICH IS 36 PERCENT OF
NORMAL. IT WAS THE 5TH DRIEST MAY ON RECORD. THE WETTEST 24-HOUR
PERIOD HAD 0.12 INCHES ON THE 21ST. NO PRECIPITATION RECORDS WERE
BROKEN THIS MONTH. THE HIGHEST WIND GUST WAS 63 MPH. IT OCCURRED ON
THE 13TH FROM THE NORTHWEST.
..THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF MAY 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 98 05/29/2003
LOW 20 05/09/2002
HIGHEST 96 05/13
LOWEST 25 05/06
AVG. MAXIMUM 73.7 70.4 3.3
AVG. MINIMUM 42.5 43.6 -1.1
MEAN 58.1 57.0 1.1
DAYS MAX >= 90 3
DAYS MAX <= 32 0
DAYS MIN <= 32 5
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 3.32 2010
MINIMUM 0.19 2001
TOTALS 0.48 1.33 -0.85 1.58
DAILY AVG. 0.02 0.04 -0.02
DAYS >= .01 6
DAYS >= .10 2
DAYS >= .50 0
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.12 05/21 TO 05/21
STORM TOTAL 0.12
DEGREE DAYS
HEATING TOTAL 252 271 -19
SINCE 7/1 5759 7486 -1727
COOLING TOTAL 46 23 23
SINCE 1/1 46 24 22
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 9.3
RESULTANT WIND SPEED/DIRECTION 3/320
HIGHEST WIND SPEED/DIRECTION 41/290 DATE 05/13
HIGHEST GUST SPEED/DIRECTION 63/290 DATE 05/13
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.19
NUMBER OF DAYS FAIR 23
NUMBER OF DAYS PC 8
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 44
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 1
LIGHT RAIN 6 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 5 FOG W/VIS <= 1/4 MILE 0
HAZE 1
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
LOOKING AHEAD TO JUNE 2026. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 76 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 49 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 87
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 56 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 1.08 INCHES.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page