Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 021621
CLMGEY

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1021 AM MDT MON OCT 02 2023

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

...THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2023...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2023

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           94   09/01
LOWEST            40   09/25
                       09/29
                       09/30
AVG. MAXIMUM    79.8               76.7     3.1
AVG. MINIMUM    48.2               45.1     3.1
MEAN            64.0               60.9     3.1
DAYS MAX >= 90     3
DAYS MAX <= 32     0
DAYS MIN <= 32     0
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        3.21   2019
 MINIMUM        0.01   2021
TOTALS          1.58               0.83    0.75     1.16
DAILY AVG.      0.05               0.03    0.02
DAYS >= .01        7
DAYS >= .10        3
DAYS >= .50        1
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.86   09/04 TO 09/04
 STORM TOTAL    0.86

DEGREE DAYS
HEATING TOTAL     69                169    -100
 SINCE 7/1        74                189    -115
COOLING TOTAL     50                 46       4
 SINCE 1/1       702                742     -40
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              5.6
RESULTANT WIND SPEED/DIRECTION   1/320
HIGHEST WIND SPEED/DIRECTION    36/300    DATE  09/18
HIGHEST GUST SPEED/DIRECTION    50/300    DATE  09/18

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.16
NUMBER OF DAYS FAIR           27
NUMBER OF DAYS PC              2
NUMBER OF DAYS CLOUDY          1

AVERAGE RH (PERCENT)     53

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       4
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       7     FOG W/VIS <= 1/4 MILE      1
HAZE                      1

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

$$


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