Climatological Report (Monthly)
Issued by NWS

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793
CXUS55 KRIW 021806
CLMGEY

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1014 AM MST THU JAN 02 2025

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR GREYBULL FOR THE MONTH OF
DECEMBER 2024...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF DECEMBER 2024 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

...GREYBULL IN DECEMBER WAS WARMER AND WETTER THAN NORMAL....

THE AVERAGE TEMPERATURE FOR GREYBULL IN DECEMBER WAS 29 DEGREES
WHICH WAS 9.7 DEGREES ABOVE NORMAL. IT WAS THE 1ST WARMEST DECEMBER
SINCE RECORDS BEGAN IN 1998. THE PREVIOUS RECORD WAS 25.8 DEGREES IN
2023. THE WARMEST TEMPERATURE FOR THE MONTH WAS 53 DEGREES ON THE
8TH. THIS BROKE THE 2004 RECORD OF 47. THE 6TH HIGH OF 47 TIED 2003.
THE 18TH HIT 50 AND BROKE THE 1999 RECORD OF 48. THE 19TH SAW 49
DEGREES AND BROKE 46 FROM 2004. THE 20TH HIGH OF 50 TIED 2020. THE
COLDEST TEMPERATURE WAS 9 DEGREES ON THE 1ST AND 28TH.

PRECIPITATION FOR THE MONTH WAS 0.23 INCHES...WHICH IS 209 PERCENT
OF NORMAL. IT WAS THE 4TH WETTEST DECEMBER ON RECORD. THE WETTEST 24-
HOUR PERIOD OCCURRED ON THE 26TH WITH 0.13 INCHES. THE 14TH HAD A
TRACE OF PRECIPITATION AND TIED SEVERAL PREVIOUS YEARS. THE HIGHEST
WIND GUST WAS 48 MPH FROM THE NORTH ON THE 29TH.

...THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2024...

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             63   12/11/2004
 LOW             -36   12/22/2022
HIGHEST           53   12/08
LOWEST             9   12/01
                       12/28
AVG. MAXIMUM    41.5               30.8    10.7
AVG. MINIMUM    16.5                7.9     8.6
MEAN            29.0               19.3     9.7
DAYS MAX >= 90     0
DAYS MAX <= 32     3
DAYS MIN <= 32    31
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        0.49   1999
 MINIMUM           T   2023
TOTALS          0.23               0.11    0.12        T
DAILY AVG.      0.01               0.00    0.01
DAYS >= .01        4
DAYS >= .10        1
DAYS >= .50        0
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.13   12/26 TO 12/26
 STORM TOTAL    0.13

DEGREE DAYS
HEATING TOTAL   1109               1415    -306
 SINCE 7/1      2504               3194    -690
COOLING TOTAL      0                  0       0
 SINCE 1/1       832                744      88
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              4.1
RESULTANT WIND SPEED/DIRECTION   1/300
HIGHEST WIND SPEED/DIRECTION    32/350    DATE  12/29
HIGHEST GUST SPEED/DIRECTION    48/360    DATE  12/29

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.29
NUMBER OF DAYS FAIR           20
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     66

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                2     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                7     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      2
HAZE                      2

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

LOOKING AHEAD TO JANUARY 2025. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 29 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 7 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 30
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 0 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 0.15 INCHES.

$$