619
CXUS55 KRIW 011705
CLMP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1055 AM MDT FRI MAY 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF APRIL 2026...
...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 2026 WILL BE
AVAILABLE APPROXIMATELY IN 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
..LAKE YELLOWSTONE WAS WARMER AND WETTER THAN NORMAL IN APRIL
AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN APRIL WAS 30.9 DEGREES
WHICH IS 2.2 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH
WAS 63 DEGREES ON THE 21ST AND BROKE THE 2009 AND 2016 RECORD OF 56.
THE 20TH HIT 60 AND BROKE THE 2010 AND 2016 RECORD OF 57. THE
COLDEST READING OF THE MONTH WAS 3 DEGREES ON THE 18TH.
TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 2.81 INCHES...WHICH WAS
123 PERCENT OF NORMAL. THE WETTEST 24-HOUR PERIOD DURING THE MONTH
WAS THE 15TH-16TH WITH 0.78 INCHES. THE 16TH HAD 0.42 AND TIED 2006.
THE 23RD HAD 0.56 INCHES AND BROKE 0.46 FROM 2007. THE HIGHEST WIND
GUST WAS 33 MPH FROM THE WEST ON THE 7TH. THERE WAS ALSO A GUST OF
32 MPH FROM THE WEST ON THE 6TH.
...THE LAKE YELLOWSTONE 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 65 04/29/2007
LOW -18 04/13/2022
HIGHEST 63 04/21
LOWEST 3 04/18
AVG. MAXIMUM 42.2 40.9 1.3
AVG. MINIMUM 19.7 16.6 3.1
MEAN 30.9 28.7 2.2
DAYS MAX >= 90 0
DAYS MAX <= 32 4
DAYS MIN <= 32 30
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 4.59 2011
MINIMUM 0.76 2008
TOTALS 2.81 2.28 0.53 2.59
DAILY AVG. 0.09 0.08 0.01
DAYS >= .01 16
DAYS >= .10 7
DAYS >= .50 1
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.78 04/15 TO 04/16
STORM TOTAL 0.56
DEGREE DAYS
HEATING TOTAL 1013 1088 -75
SINCE 7/1 9042 10651 -1609
COOLING TOTAL 0 0 0
SINCE 1/1 0 0 0
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 2.7
RESULTANT WIND SPEED/DIRECTION 0/150
HIGHEST WIND SPEED/DIRECTION 20/270 DATE 04/07
HIGHEST GUST SPEED/DIRECTION 33/260 DATE 04/07
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.00
NUMBER OF DAYS FAIR 30
NUMBER OF DAYS PC 0
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 69
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 0
LIGHT RAIN 4 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 15 SLEET 0
FOG 0 FOG W/VIS <= 1/4 MILE 0
HAZE 0
- 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 46 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 21
DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 55 DEGREES AND
THE AVERAGE LOW TEMPERATURE IS 30 DEGREES. THE AVERAGE MONTHLY
PRECIPITATION IS 2.35 INCHES.
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