066
CXUS55 KRIW 011719
CLMRKS
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1105 AM MDT THU OCT 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR ROCK SPRINGS FOR THE
MONTH OF SEPTEMBER 2026...
...OFFICIAL CLIMATE DATA FOR THE MONTH OF SEPTEMBER 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
..ROCK SPRINGS WAS DRIER AND WARMER THAN NORMAL IN SEPTEMBER
THE AVERAGE TEMPERATURE FOR ROCK SPRINGS IN SEPTEMBER WAS 61 DEGREES
WHICH WAS 3.7 DEGREES ABOVE NORMAL. IT WAS THE 6TH WARMEST SEPTEMBER
ON RECORD. THE WARMEST READING FOR THE MONTH WAS 85 DEGREES ON THE
13TH. THE COLDEST TEMPERATURE WAS 36 DEGREES ON THE 20TH. NO
TEMPERATURE RECORDS WERE BROKEN THIS MONTH.
PRECIPITATION FOR THE MONTH WAS 0.31 INCHES...WHICH WAS 39 PERCENT
OF NORMAL. THE WETTEST 24-HOUR PERIOD WAS ON THE 18TH-19TH WITH 0.19
INCHES. NO PRECIPITATION RECORDS WERE BROKEN THIS MONTH. THE HIGHEST
WIND GUST WAS 62 MPH FROM THE SOUTH ON THE 17TH.
...THE ROCK SPRINGS WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER
2026...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1948 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
RECORD
HIGH 93 09/04/2022
LOW 5 09/18/1965
HIGHEST 85 09/13
LOWEST 36 09/20
AVG. MAXIMUM 74.4 70.7 3.7
AVG. MINIMUM 47.6 43.9 3.7
MEAN 61.0 57.3 3.7
DAYS MAX >= 90 0
DAYS MAX <= 32 0
DAYS MIN <= 32 0
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 3.67 1965
MINIMUM T 2018
TOTALS 0.31 0.79 -0.48 0.54
DAILY AVG. 0.01 0.03 -0.02
DAYS >= .01 8
DAYS >= .10 1
DAYS >= .50 0
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.19 09/18 TO 09/19
STORM TOTAL 0.12
SNOWFALL (INCHES)
TOTALS MM 1.2 MM
SINCE 7/1 MM 1.2 MM
SNOWDEPTH AVG. MM
DAYS >= 1.0 MM
DEGREE DAYS
HEATING TOTAL 133 242 -109
SINCE 7/1 147 301 -154
COOLING TOTAL 21 11 10
SINCE 1/1 558 320 238
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 9.7
RESULTANT WIND SPEED/DIRECTION 5/230
HIGHEST WIND SPEED/DIRECTION 47/160 DATE 09/17
HIGHEST GUST SPEED/DIRECTION 62/170 DATE 09/17
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.19
NUMBER OF DAYS FAIR 24
NUMBER OF DAYS PC 6
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 45
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 6 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 3
LIGHT RAIN 11 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 4 FOG W/VIS <= 1/4 MILE 1
HAZE 2
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
LOOKING AHEAD TO OCTOBER 2026. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 64 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 38 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 49
DEGREES AND THE AVERAGE LOW TEMPERATURE IS 28. THE AVERAGE MONTHLY
PRECIPITATION IS 0.81 INCHES.
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