Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 011720
CLMGEY

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1020 AM MST SAT JAN 01 2022

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR GREYBULL FOR THE MONTH OF
DECEMBER 2021...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF DECEMBER 2021 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 WAS MUCH WARMER THAN NORMAL AND DRIEST DECEMBER...

THE AVERAGE TEMPERATURE FOR GREYBULL IN DECEMBER WAS 25.5 DEGREES
WHICH WAS 6.2 DEGREES ABOVE NORMAL. THIS WAS THE 3RD WARMEST
DECEMBER WITH RECORDS GOING BACK TO 1998. THE WARMEST READING FOR
THE MONTH WAS 60 DEGREES ON THE 2ND...WHICH TIED THE 1998 DAILY
RECORD. THE 13TH HAD A HIGH OF 51...WHICH BROKE THE 2014 RECORD OF
50...AND THE 14TH HIT 59 DEGREES...WHICH BROKE THE 2003 RECORD OF
52. THE COLDEST TEMPERATURE WAS 6 BELOW ZERO ON THE 31ST.

PRECIPITATION FOR THE MONTH WAS A 0.01 INCHES...WHICH IS JUST 9
PERCENT OF NORMAL. THIS TIES WITH 2 OTHER YEARS AS THE DRIEST
DECEMBER ON RECORD. THE WETTEST 24-HOUR PERIOD OCCURRED ON THE 10TH
WITH 0.01 INCHES. TWO DAILY RECORDS WERE TIED. THE 17TH HAD A
TRACE...WHICH TIED 2012 AND THE 25TH HAD A TRACE...WHICH TIED 2007
AND 2014. THE HIGHEST WIND GUST WAS 58 MPH FROM THE NORTH ON THE 5TH.

...THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2021...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             63   12/11/2004
 LOW             -25   12/18/2016
HIGHEST           60   12/02
LOWEST            -6   12/31
AVG. MAXIMUM    38.3               30.8     7.5
AVG. MINIMUM    12.7                7.9     4.8
MEAN            25.5               19.3     6.2
DAYS MAX >= 90     0
DAYS MAX <= 32    11
DAYS MIN <= 32    30
DAYS MIN <= 0      2

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        0.49   1999
 MINIMUM        0.01   2019
TOTALS          0.01R              0.11   -0.10     0.04
DAILY AVG.      0.00               0.00   -0.00
DAYS >= .01        1
DAYS >= .10        0
DAYS >= .50        0
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.01   12/10 TO 12/10
 STORM TOTAL    0.01


DEGREE DAYS
HEATING TOTAL   1217               1415    -198
 SINCE 7/1      2636               3194    -558
COOLING TOTAL      0                  0       0
 SINCE 1/1       967                744     223
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.9
RESULTANT WIND SPEED/DIRECTION   1/260
HIGHEST WIND SPEED/DIRECTION    44/330    DATE  12/15
HIGHEST GUST SPEED/DIRECTION    58/360    DATE  12/05

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.26
NUMBER OF DAYS FAIR           23
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY          2

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                1     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                7     SLEET                      0
FOG                       6     FOG W/VIS <= 1/4 MILE      0
HAZE                      1

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

LOOKING AHEAD TO JANUARY 2022...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 29 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 6 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 30
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 7 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 0.15 INCHES.

$$


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