987
CXUS55 KRIW 011703
CLMGEY
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1055 AM MDT FRI MAY 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR GREYBULL FOR THE MONTH OF
APRIL 2026...
...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 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 MARCH WAS WETTER AND WARMER THAN NORMAL.
THE AVERAGE TEMPERATURE FOR GREYBULL IN APRIL WAS 46.9 DEGREES WHICH
IS 0.2 DEGREES ABOVE NORMAL. THE WARMEST TEMPERATURE FOR THE MONTH
WAS 85 DEGREES ON THE 21ST. THIS BROKE THE 2009 RECORD OF 80. THE
20TH HIGH OF 80 BROKE 76 FROM 2009. THE COLDEST TEMPERATURE WAS 25
DEGREES ON THE 17TH AND 18TH. THE LOW ON THE 19TH WAS 26 DEGREES AND
BROKE THE 2002 RECORD OF 27. THE 26TH LOW OF 26 DEGREES BROKE 28
FROM 2002 AND 2010. THE 28TH DROPPED TO 27 DEGREES BREAKING 28 FROM
2005.
PRECIPITATION FOR THE MONTH WAS 0.65 INCHES...WHICH IS 123 PERCENT
OF NORMAL. THE WETTEST 24-HOUR PERIOD HAD 0.51 INCHES ON THE 2ND AND
BROKE 0.08 FROM 2017. THE 1ST HAD 0.02 AND TIED 2010. THE 3RD HAD
0.07 INCHES AND BROKE THE 2009 RECORD OF 0.06. THE HIGHEST WIND GUST
WAS 63 MPH. IT OCCURRED ON THE 22ND FROM THE SOUTHWEST.
..THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 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 88 04/23/2012
04/29/2007
LOW 5 04/21/2008
HIGHEST 85 04/21
LOWEST 25 04/17
04/18
AVG. MAXIMUM 61.2 60.0 1.2
AVG. MINIMUM 32.6 33.4 -0.8
MEAN 46.9 46.7 0.2
DAYS MAX >= 90 0
DAYS MAX <= 32 0
DAYS MIN <= 32 16
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 1.55 2022
MINIMUM 0.04 2023
TOTALS 0.65 0.53 0.12 0.45
DAILY AVG. 0.02 0.02 0.00
DAYS >= .01 6
DAYS >= .10 1
DAYS >= .50 1
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.51 04/02 TO 04/02
STORM TOTAL 0.51
DEGREE DAYS
HEATING TOTAL 536 550 -14
SINCE 7/1 5507 7213 -1706
COOLING TOTAL 0 1 -1
SINCE 1/1 0 1 -1
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 8.4
RESULTANT WIND SPEED/DIRECTION 3/320
HIGHEST WIND SPEED/DIRECTION 41/250 DATE 04/22
HIGHEST GUST SPEED/DIRECTION 63/250 DATE 04/22
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.33
NUMBER OF DAYS FAIR 18
NUMBER OF DAYS PC 7
NUMBER OF DAYS CLOUDY 5
AVERAGE RH (PERCENT) 52
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 1 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 1
LIGHT RAIN 12 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 1
LIGHT SNOW 6 SLEET 0
FOG 6 FOG W/VIS <= 1/4 MILE 0
HAZE 3
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
LOOKING AHEAD TO MAY 2026. THE AVERAGE HIGH TEMPERATURE ON THE FIRST
OF THE MONTH IS 65 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 38
DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 76 DEGREES AND
THE AVERAGE LOW TEMPERATURE IS 49 DEGREES. THE AVERAGE MONTHLY
PRECIPITATION IS 1.33 INCHES.
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