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CXUS55 KRIW 012012
CLMGEY

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

...................................

...THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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            103   09/04/2022
 LOW              27   09/18/2003
                       09/29/1999
HIGHEST           93   09/02
LOWEST            39   09/06
AVG. MAXIMUM    81.4               76.7     4.7
AVG. MINIMUM    47.4               45.1     2.3
MEAN            64.4               60.9     3.5
DAYS MAX >= 90     4
DAYS MAX <= 32     0
DAYS MIN <= 32     0
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        3.21   2019
 MINIMUM        0.01   2021
TOTALS          0.65               0.83   -0.18     0.38
DAILY AVG.      0.02               0.03   -0.01
DAYS >= .01        4
DAYS >= .10        1
DAYS >= .50        1
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.53   09/22 TO 09/22
 STORM TOTAL    0.53

DEGREE DAYS
HEATING TOTAL     61                169    -108
 SINCE 7/1        61                189    -128
COOLING TOTAL     50                 46       4
 SINCE 1/1       791                742      49
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              5.5
RESULTANT WIND SPEED/DIRECTION   1/320
HIGHEST WIND SPEED/DIRECTION    35/340    DATE  09/04
HIGHEST GUST SPEED/DIRECTION    45/330    DATE  09/04
                                45/310          09/07

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.12
NUMBER OF DAYS FAIR           26
NUMBER OF DAYS PC              4
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     50

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                6     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       5     FOG W/VIS <= 1/4 MILE      1
HAZE                      0

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$