462
CXUS55 KRIW 012026
CLMLND
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
212 PM MDT WED OCT 01 2025
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LANDER FOR THE MONTH OF
SEPTEMBER 2025...
...OFFICIAL CLIMATE DATA FOR THE MONTH OF SEPTEMBER 2025 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
..LANDER WAS WARMER AND WETTER THAN NORMAL IN SEPTEMBER.
THE AVERAGE TEMPERATURE FOR LANDER IN SEPTEMBER WAS 62.9 DEGREES
WHICH WAS 3.3 DEGREES ABOVE NORMAL. THE WARMEST READING FOR THE
MONTH WAS 89 DEGREES ON THE 10TH. THE COLDEST TEMPERATURE WAS 38
DEGREES ON THE 16TH. NO TEMPERATURE RECORDS WERE BROKEN THIS MONTH.
PRECIPITATION FOR THE MONTH WAS 1.20 INCHES...WHICH IS 122 PERCENT
OF NORMAL. THE WETTEST 24-HOUR PERIOD WAS THE 22ND WHEN 0.79 INCHES
OF PRECIPITATION FELL. NO PRECIPITATION RECORDS WERE BROKEN THIS
MONTH. THE HIGHEST WIND GUST WAS 69 MPH AND OCCURRED ON THE 10TH
FROM THE SOUTHWEST.
..THE LANDER WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1891 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
RECORD
HIGH 99 09/04/2022
LOW 7 09/22/1895
HIGHEST 89 09/10
LOWEST 38 09/16
AVG. MAXIMUM 77.3 74.6 2.7
AVG. MINIMUM 48.6 44.6 4.0
MEAN 62.9 59.6 3.3
DAYS MAX >= 90 0
DAYS MAX <= 32 0
DAYS MIN <= 32 0
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 5.64 1923
MINIMUM T 2010
TOTALS 1.20 0.98 0.22 0.40
DAILY AVG. 0.04 0.03 0.01
DAYS >= .01 7
DAYS >= .10 2
DAYS >= .50 1
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.79 09/22 TO 09/22
STORM TOTAL 0.79
SNOWFALL (INCHES)
TOTALS 0.0 1.5 -1.5
SINCE 7/1 0.0 1.5 -1.5
SNOWDEPTH AVG. 0
DAYS >= 1.0 0
DEGREE DAYS
HEATING TOTAL 99 195 -96
SINCE 7/1 104 233 -129
COOLING TOTAL 42 32 10
SINCE 1/1 569 484 85
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 6.0
RESULTANT WIND SPEED/DIRECTION 1/260
HIGHEST WIND SPEED/DIRECTION 54/180 DATE 09/11
HIGHEST GUST SPEED/DIRECTION 69/220 DATE 09/10
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.17
NUMBER OF DAYS FAIR 26
NUMBER OF DAYS PC 3
NUMBER OF DAYS CLOUDY 1
AVERAGE RH (PERCENT) 47
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 3 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 2
LIGHT RAIN 13 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 2 FOG W/VIS <= 1/4 MILE 0
HAZE 4
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
LOOKING AHEAD TO OCTOBER 2025. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 67 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 38 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 52
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 26. THE AVERAGE MONTHLY
PRECIPITATION IS 1.40 INCHES. THE AVERAGE SNOWFALL IS 10.5 INCHES.
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