790
CXUS55 KRIW 011701
CLMCPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1055 AM MDT FRI MAY 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR CASPER 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
..APRIL IN CASPER WAS WARMER AND DRIER THAN NORMAL
AVERAGE TEMPERATURE FOR CASPER IN APRIL WAS 44.1 DEGREES WHICH IS
1.8 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH WAS 81
DEGREES ON THE 21ST. THE COLDEST READING FOR THE MONTH WAS 20
DEGREES ON THE 5TH. NO TEMPERATURE RECORDS WERE BROKEN THIS MONTH.
TOTAL PRECIPITATION FOR THE MONTH WAS 1.28 INCHES...WHICH IS 91
PERCENT OF NORMAL. THE WETTEST 24-HOUR PERIOD DURING THE MONTH WAS
ON THE 16TH-17TH WITH 0.56 INCHES. NO PRECIPITATION OR SNOWFALL
RECORDS WERE BROKEN THIS MONTH.
THE SNOWFALL FOR THE MONTH WAS 9.8 INCHES WHICH IS 93 PERCENT OF
NORMAL. THE SNOWIEST 24-HOURS WAS ON THE 16TH-17TH WITH 5.5 INCHES.
THE HIGHEST WIND GUST WAS 67 MPH FROM THE SOUTHWEST ON THE 22ND.
THERE WAS ALSO A GUST OF 63 MPH FROM THE SOUTHWEST ON THE 11TH.
..THE CASPER WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 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 84 04/30/1992
LOW -6 04/12/1997
HIGHEST 81 04/21
LOWEST 20 04/05
AVG. MAXIMUM 59.3 56.3 3.0
AVG. MINIMUM 28.8 28.2 0.6
MEAN 44.0 42.3 1.8
DAYS MAX >= 90 0
DAYS MAX <= 32 1
DAYS MIN <= 32 22
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 5.75 1941
MINIMUM 0.08 1992
TOTALS 1.28 1.41 -0.13 1.59
DAILY AVG. 0.04 0.05 -0.01
DAYS >= .01 8
DAYS >= .10 5
DAYS >= .50 0
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.56 04/16 TO 04/17
STORM TOTAL 0.44
SNOWFALL (INCHES)
TOTALS 9.8 10.5 -0.7
SINCE 7/1 27.1 69.1 -42.0
SNOWDEPTH AVG. 0
DAYS >= 1.0 4
DEGREE DAYS
HEATING TOTAL 620 682 -62
SINCE 7/1 5383 6953 -1570
COOLING TOTAL 0 0 0
SINCE 1/1 0 0 0
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 12.1
RESULTANT WIND SPEED/DIRECTION 5/250
HIGHEST WIND SPEED/DIRECTION 53/220 DATE 04/22
HIGHEST GUST SPEED/DIRECTION 67/200 DATE 04/22
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.34
NUMBER OF DAYS FAIR 18
NUMBER OF DAYS PC 6
NUMBER OF DAYS CLOUDY 6
AVERAGE RH (PERCENT) 55
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 0
LIGHT RAIN 8 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 1
HEAVY SNOW 1 SNOW 2
LIGHT SNOW 10 SLEET 0
FOG 11 FOG W/VIS <= 1/4 MILE 3
HAZE 2
- 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 60 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 32
DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 73
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 42. THE AVERAGE MONTHLY
PRECIPITATION IS 2.21 INCHES. THE AVERAGE SNOWFALL IS 2.6 INCHES.
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