Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 011727
CLMLND

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LANDER 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

...LANDER WAS DRIER AND MUCH WARMER THAN NORMAL IN DECEMBER...

THE AVERAGE TEMPERATURE FOR LANDER IN DECEMBER WAS 31.5 DEGREES
WHICH WAS 9.9 DEGREES ABOVE NORMAL. THIS WAS THE 4TH WARMEST
DECEMBER WITH RECORDS GOING BACK TO 1891. THE WARMEST READING FOR
THE MONTH WAS 65 DEGREES ON THE 2ND...WHICH BROKE THE 2012 RECORD OF
62. ONE ANCIENT HIGH TEMPERATURE RECORD FROM 1903 WAS BROKEN ON THE
1ST...WHEN THE HIGH REACHED 61 DEGREES. THE 4TH HIT 64
DEGREES...WHICH BROKE THE 1979 RECORD OF 62. THE COLDEST TEMPERATURE
WAS 0 DEGREES ON THE 18TH.

PRECIPITATION FOR THE MONTH WAS 0.37 INCHES...WHICH IS 59 PERCENT OF
NORMAL. THE WETTEST 24-HOUR PERIOD WAS ON THE 15TH WHEN 0.23 INCHES
FELL...THIS BROKE THE 1992 RECORD OF 0.22.

THE TOTAL SNOWFALL IN DECEMBER WAS 3 INCHES...WHICH IS 6.3 INCHES
BELOW NORMAL THE SNOWIEST DAY WAS ON THE 15TH WITH 1.6 INCHES OF
SNOW. THE HIGHEST  WIND GUST WAS 69 MPH FROM THE SOUTH ON THE 15TH.

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

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1891 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             65   12/11/1937
                       12/10/1933
 LOW             -40   12/19/1924
HIGHEST           65R  12/02
LOWEST             0   12/18
AVG. MAXIMUM    44.0               32.9    11.1
AVG. MINIMUM    19.0               10.2     8.8
MEAN            31.5               21.6     9.9
DAYS MAX >= 90     0
DAYS MAX <= 32     8
DAYS MIN <= 32    27
DAYS MIN <= 0      1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        2.06   1909
 MINIMUM           T   1933
TOTALS          0.37               0.63   -0.26     0.59
DAILY AVG.      0.01               0.02   -0.01
DAYS >= .01        5
DAYS >= .10        1
DAYS >= .50        0
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.23   12/15 TO 12/15
 STORM TOTAL    0.23

SNOWFALL (INCHES)
TOTALS           3.0                9.3    -6.3
SINCE 7/1       12.4               31.9   -19.5
SNOWDEPTH AVG.     0
DAYS >= 1.0        1

DEGREE DAYS
HEATING TOTAL   1032               1347    -315
 SINCE 7/1      2480               3177    -697
COOLING TOTAL      0                  0       0
 SINCE 1/1       697                485     212
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.0
RESULTANT WIND SPEED/DIRECTION   4/230
HIGHEST WIND SPEED/DIRECTION    54/200    DATE  12/15
HIGHEST GUST SPEED/DIRECTION    69/190    DATE  12/15

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.21
NUMBER OF DAYS FAIR           24
NUMBER OF DAYS PC              5
NUMBER OF DAYS CLOUDY          2

AVERAGE RH (PERCENT)     54

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                       4
LIGHT SNOW                7     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      3
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 0.51 INCHES. THE AVERAGE MONTHLY SNOWFALL IS 8.2
INCHES.

$$


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