868
CXUS55 KRIW 012028
CLMRKS

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
212 PM MDT WED OCT 01 2025

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR ROCK SPRINGS 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

...ROCK SPRINGS WAS WARMER AND DRIER THAN NORMAL IN SEPTEMBER...

THE AVERAGE TEMPERATURE FOR ROCK SPRINGS IN SEPTEMBER WAS 60 DEGREES
WHICH WAS 2.7 DEGREES ABOVE NORMAL. THE WARMEST READING FOR THE
MONTH WAS 86 DEGREES ON THE 3RD. THE COLDEST TEMPERATURE WAS 34
DEGREES ON THE 24TH. NO TEMPERATURE RECORDS WERE BROKEN THIS MONTH.

PRECIPITATION FOR THE MONTH WAS 0.54 INCHES...WHICH WAS 68 PERCENT
OF NORMAL. THE WETTEST 24-HOUR PERIOD WAS ON THE 22ND-23RD WITH 0.30
INCHES. NO PRECIPITATION RECORDS WERE BROKEN THIS MONTH. THE HIGHEST
WIND GUST WAS 51 MPH FROM THE SOUTHWEST ON THE 10TH.

...THE ROCK SPRINGS WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER
2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1948 TO 2025

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           86   09/03
LOWEST            34   09/24
AVG. MAXIMUM    74.2               70.7     3.5
AVG. MINIMUM    45.8               43.9     1.9
MEAN            60.0               57.3     2.7
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          0.54               0.79   -0.25     0.39
DAILY AVG.      0.02               0.03   -0.01
DAYS >= .01        8
DAYS >= .10        1
DAYS >= .50        0
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.30   09/22 TO 09/23
 STORM TOTAL    0.22

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    163                242     -79
 SINCE 7/1       181                301    -120
COOLING TOTAL     19                 11       8
 SINCE 1/1       441                320     121
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.3
RESULTANT WIND SPEED/DIRECTION   2/210
HIGHEST WIND SPEED/DIRECTION    38/230    DATE  09/12
HIGHEST GUST SPEED/DIRECTION    51/210    DATE  09/10
                                51/240          09/12

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.25
NUMBER OF DAYS FAIR           22
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY          1

AVERAGE RH (PERCENT)     48

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              6     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       3
LIGHT RAIN               15     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 2025. 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.

$$