311
CXUS55 KRIW 012110
CLMP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
258 PM MDT MON SEP 01 2025
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF AUGUST 2025...
...OFFICIAL CLIMATE DATA FOR THE MONTH OF AUGUST 2025 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 DRIER THAN NORMAL IN AUGUST
AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN AUGUST WAS 55.5 DEGREES
WHICH IS 1.6 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH
WAS 80 DEGREES ON THE 21ST AND 23RD. THE 23RD BROKE THE RECORD OF 79
DEGREES FROM 2006 AND 2020. THE COLDEST READING OF THE MONTH WAS 30
DEGREES ON THE 9TH.
TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 1.09 INCHES...WHICH WAS
81 PERCENT OF NORMAL. THE WETTEST 24-HOUR PERIOD DURING THE MONTH
WAS THE 27TH-28TH WHEN 0.83 INCHES OF PRECIPITATION FELL. THE 28TH
HAD 0.68 INCHES AND BROKE THE 2013 RECORD OF 0.23. THE HIGHEST WIND
GUST WAS 42 MPH FROM THE SOUTHEAST ON THE 4TH.
...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF AUGUST
2025...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
RECORD
HIGH 85 08/17/2020
LOW 25 08/31/2005
HIGHEST 80 08/13
08/21
08/23
LOWEST 30 08/09
AVG. MAXIMUM 72.6 70.7 1.9
AVG. MINIMUM 38.5 37.0 1.5
MEAN 55.5 53.9 1.6
DAYS MAX >= 90 0
DAYS MAX <= 32 0
DAYS MIN <= 32 1
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 4.37 2023
MINIMUM 0.13 2012
TOTALS 1.09 1.34 -0.25 1.25
DAILY AVG. 0.04 0.04 -0.00
DAYS >= .01 8
DAYS >= .10 2
DAYS >= .50 1
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.83 08/27 TO 08/28
STORM TOTAL 0.68
DEGREE DAYS
HEATING TOTAL 285 346 -61
SINCE 7/1 516 641 -125
COOLING TOTAL 0 0 0
SINCE 1/1 1 0 1
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 2.3
RESULTANT WIND SPEED/DIRECTION 0/320
HIGHEST WIND SPEED/DIRECTION 20/280 DATE 08/04
HIGHEST GUST SPEED/DIRECTION 42/140 DATE 08/04
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.00
NUMBER OF DAYS FAIR 31
NUMBER OF DAYS PC 0
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 55
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 4 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 0
LIGHT RAIN 8 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 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 SEPTEMBER 2025. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 67 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 33 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 53
DEGREES AND THE AVERAGE LOW TEMPERATURE IS 27 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 1.57 INCHES.
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