400
CXUS55 KRIW 011707
CLMRIW
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1055 AM MDT FRI MAY 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON 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
..RIVERTON WAS WARMER AND DRIER THAN NORMAL IN APRIL.
THE AVERAGE TEMPERATURE FOR RIVERTON IN APRIL WAS 45.4 DEGREES WHICH
WAS 1.9 DEGREES ABOVE NORMAL. THE WARMEST READING FOR THE MONTH WAS
80 DEGREES ON THE 21ST AND BROKE THE 2009 RECORD OF 74. THE 20TH
HIGH OF 77 BROKE 74 FROM 2019. THE COLDEST READING WAS 22 DEGREES ON
THE 4TH. THE LOW OF 26 DEGREES ON THE 26TH TIED 2008.
PRECIPITATION FOR THE MONTH WAS 0.42 INCHES...WHICH IS 35 PERCENT OF
NORMAL. IT WAS THE 4TH DRIEST APRIL ON RECORD. THE WETTEST 24-HOURS
WAS THE 26TH WHEN 0.21 INCHES FELL. NO PRECIPITATION OR SNOWFALL
RECORDS WERE BROKEN THIS MONTH.
SNOWFALL FOR THE MONTH WAS 4.3 INCHES. THE SNOWIEST 24-HOURS WAS ON
THE 26TH WHEN 2.2 INCHES FELL. THE HIGHEST WIND GUST WAS 60 MPH FROM
THE SOUTHWEST AND OCCURRED ON THE 11TH. THERE WAS ALSO A GUST OF 58
MPH FROM THE WEST ON THE 22ND.
..THE RIVERTON WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 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 85 04/24/2012
LOW 2 04/03/2020
HIGHEST 80 04/21
LOWEST 22 04/04
AVG. MAXIMUM 59.5 56.8 2.7
AVG. MINIMUM 31.3 30.1 1.2
MEAN 45.4 43.5 1.9
DAYS MAX >= 90 0
DAYS MAX <= 32 0
DAYS MIN <= 32 18
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 3.31 2016
MINIMUM 0.10 2007
TOTALS 0.42 1.20 -0.78 1.16
DAILY AVG. 0.01 0.04 -0.03
DAYS >= .01 7
DAYS >= .10 1
DAYS >= .50 0
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.21 04/26 TO 04/26
STORM TOTAL 0.21
SNOWFALL (INCHES)
TOTALS 4.3 MM MM
SINCE 7/1 15.6 MM MM
SNOWDEPTH AVG. 0
DAYS >= 1.0 3
DEGREE DAYS
HEATING TOTAL 582 647 -65
SINCE 7/1 5418 7435 -2017
COOLING TOTAL 0 0 0
SINCE 1/1 0 0 0
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 10.3
RESULTANT WIND SPEED/DIRECTION 5/290
HIGHEST WIND SPEED/DIRECTION 46/260 DATE 04/22
HIGHEST GUST SPEED/DIRECTION 60/250 DATE 04/11
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.34
NUMBER OF DAYS FAIR 11
NUMBER OF DAYS PC 6
NUMBER OF DAYS CLOUDY 2
AVERAGE RH (PERCENT) 48
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 0
LIGHT RAIN 6 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 3
LIGHT SNOW 7 SLEET 0
FOG 5 FOG W/VIS <= 1/4 MILE 1
HAZE 1
- 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 61 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 34
DEGREES. THE AVERAGE HIGH AT THE END OF THE MONTH IS 73 DEGREES AND
THE AVERAGE LOW TEMPERATURE IS 44. THE AVERAGE MONTHLY PRECIPITATION
IS 1.92 INCHES.
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