854
CXUS55 KRIW 011705
CLMGEY

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1105 AM MDT THU OCT 01 2026

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

...THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2026...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2026

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   09/04
LOWEST            40   09/15
                       09/30
AVG. MAXIMUM    80.7               76.7     4.0
AVG. MINIMUM    48.1               45.1     3.0
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          0.17               0.83   -0.66     0.65
DAILY AVG.      0.01               0.03   -0.02
DAYS >= .01        4
DAYS >= .10        1
DAYS >= .50        0
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.12   09/20 TO 09/20
 STORM TOTAL    0.12


DEGREE DAYS
HEATING TOTAL     70                169     -99
 SINCE 7/1        72                189    -117
COOLING TOTAL     57                 46      11
 SINCE 1/1       855                742     113
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.3
RESULTANT WIND SPEED/DIRECTION   2/310
HIGHEST WIND SPEED/DIRECTION    33/320    DATE  09/11
HIGHEST GUST SPEED/DIRECTION    47/150    DATE  09/02

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.13
NUMBER OF DAYS FAIR           28
NUMBER OF DAYS PC              1
NUMBER OF DAYS CLOUDY          1

AVERAGE RH (PERCENT)     47

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                9     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      1
HAZE                      2

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

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