Climatological Report (Monthly)
Issued by NWS Riverton, WY

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CXUS55 KRIW 011736 CCA
CLMRIW

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1030 AM MST SAT JAN 01 2022

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON 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

...RIVERTON WAS MUCH DRIER AND WARMEST EVER DECEMBER...

THE AVERAGE TEMPERATURE FOR RIVERTON IN DECEMBER WAS 29.8 DEGREES
WHICH WAS 10.2 DEGREES ABOVE NORMAL. THIS WAS THE WARMEST DECEMBER
WITH RECORDS GOING BACK TO 1995. THE WARMEST READING FOR THE MONTH
WAS 61 DEGREES ON THE 1ST...WHICH TIED THE 1995 RECORD...AND THE
2ND...WHICH BROKE THE 2012 RECORD OF 60. SEVERAL OTHER HIGH
TEMPERATURE RECORDS WERE SET THIS MONTH. THE 8TH HIT 51...WHICH
BROKE THE1996 RECORD OF 46...THE 14TH HIGH OF 54 DEGREES...TIED
2010...AND THE 21ST HIT 51...WHICH BROKE THE 2020 RECORD OF 50. THE
24TH HIT 47 DEGREES...WHICH BROKE THE 2005 RECORD OF 44...AND THE
25TH TIED THE 2005 RECORD OF 41 DEGREES. THE COLDEST TEMPERATURE WAS
1 DEGREE BELOW ZERO ON THE 18TH.

PRECIPITATION FOR THE MONTH WAS 0.07 INCHES...WHICH IS 27 PERCENT OF
NORMAL. THIS IS THE 5TH DRIEST DECEMBER ON RECORD. THE WETTEST 24-
HOUR PERIOD OCCURRED ON 3 DIFFERENT DAYS...ON THE 15TH...THE 26TH
AND THE 27TH...WHEN 0.02 INCHES FELL. THE 10TH HAD 0.01
INCHES...WHICH TIED THE 2007 RECORD.

TOTAL SNOWFALL FOR DECEMBER WAS 1.7 INCHES. THE SNOWIEST 24-HOUR
PERIOD WAS ON THE 15TH...WITH 0.6 INCHES OF SNOW. THE HIGHEST WIND
GUST WAS 60 MPH FROM THE NORTH ON THE 15TH.


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

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1995 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             61   12/01/1995
 LOW             -29   12/21/1998
                       12/21/1998
HIGHEST           61R  12/01
                       12/02
LOWEST             -1  12/18
AVG. MAXIMUM    42.1               30.8    11.3
AVG. MINIMUM    17.5                8.4     9.1
MEAN            29.8               19.6    10.2
DAYS MAX >= 90     0
DAYS MAX <= 32     6
DAYS MIN <= 32    28
DAYS MIN <= 0      1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        0.77   2016
 MINIMUM           T   2001
TOTALS          0.07               0.26   -0.19     0.36
DAILY AVG.      0.00               0.01   -0.01
DAYS >= .01        4
DAYS >= .10        0
DAYS >= .50        0
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.02   12/15 TO 12/15
                       12/26 TO 12/26
                       12/27 TO 12/27
 STORM TOTAL    0.02

SNOWFALL (INCHES)
TOTALS           1.7                 MM      MM
SINCE 7/1        4.5                 MM      MM
SNOWDEPTH AVG.     T
DAYS >= 1.0        0

DEGREE DAYS
HEATING TOTAL   1081               1407    -326
 SINCE 7/1      2571               3306    -735
COOLING TOTAL      0                  0       0
 SINCE 1/1       707                499     208
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              10.4
RESULTANT WIND SPEED/DIRECTION   5/250
HIGHEST WIND SPEED/DIRECTION    39/010    DATE  12/15
HIGHEST GUST SPEED/DIRECTION    60/010    DATE  12/15

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.12
NUMBER OF DAYS FAIR           26
NUMBER OF DAYS PC              5
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     55

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                0     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       1
LIGHT SNOW                7     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.

LOOKING AHEAD TO JANUARY 2022...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 30 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 7 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 32 DEGREES
AND THE AVERAGE LOW TEMPERATURE IS 9. THE AVERAGE MONTHLY
PRECIPITATION IS 0.29 INCHES.

$$


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