Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 012137
CLMCPR

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
237 PM MST MON JAN 1 2018

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE NATRONA COUNTY
INTERNATIONAL AIRPORT NEAR CASPER FOR THE MONTH OF DECEMBER 2017...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF DECEMBER 2017 WILL BE
AVAILABLE APPROXIMATELY IN JANUARY 2018 FROM THE NATIONAL CENTER FOR
ENVIRONMENTAL INFORMATION HTTP://WWW.NCEI.NOAA.GOV/OL/
CLIMATEDATA.HTML). UNOFFICIAL ASOS DAILY SUMMARIES ARE AVAILABLE ON
THE INTERNET AT HTTP://WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW

...CASPER WAS MUCH WETTER THAN NORMAL IN DECEMBER...

THE AVERAGE TEMPERATURE FOR CASPER IN DECEMBER WAS 22.5 DEGREES.
THIS WAS 1.3 DEGREES BELOW NORMAL. THE WARMEST READING OF THE MONTH
WAS 57 DEGREES ON THE 3RD.  THE COLDEST READING OF THE MONTH WAS -18
DEGREES ON THE 31ST. A RECORD WAS SET ON THE 26TH WHEN -17 DEGREES
BROKE -8 SET IN 1996.

TOTAL PRECIPITATION FOR THE MONTH WAS 1.37 INCHES...WHICH WAS 280
PERCENT OF NORMAL. IT WAS THE 2ND WETTEST DECEMBER ON RECORD. THE
WETTEST 24 HOUR PERIOD OF THE MONTH WAS ON THE 21ST...WHEN 0.35
INCHES OF PRECIPITATION FELL. THIS BROKE THE PREVIOUS RECORD OF 0.21
INCHES SET IN 2003. 0.26 INCHES FELL ON THE 4TH BREAKING THE PREVIOUS
RECORD OF 0.19 SET IN 1983. TOTAL SNOWFALL FOR DECEMBER WAS 19.4
INCHES...WHICH IS 8.4 INCHES ABOVE NORMAL...OR 176 PERCENT OF NORMAL,
MAKING IT THE 6TH SNOWIEST DECEMBER ON RECORD. THE SNOWIEST DAY WAS
THE 21ST...WITH 6 INCHES FALLING. THIS BROKE THE PREVIOUS RECORD OF
3.8 INCHES THAT FELL IN 2011. A RECORD WAS ALSO BROKEN ON THE 4TH
WHEN 4.8 INCHES FELL BREAKING THE PREVIOUS RECORD OF 3.4 THE HIGHEST
SET IN 1977.
THE HIGHEST WIND GUST WAS 51 MPH ON THE 3RD.

...THE CASPER WY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1939 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              65   12/05/1939
 LOW              -41   12/21/1939
HIGHEST            57   12/03
LOWEST            -18   12/31
AVG. MAXIMUM     33.0              34.2    -1.2
AVG. MINIMUM     12.1              13.5    -1.4
MEAN             22.5              23.8    -1.3
DAYS MAX >= 90      0
DAYS MAX <= 32     12
DAYS MIN <= 32     30
DAYS MIN <= 0       8

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.71   1982
 MINIMUM         0.03   1952
TOTALS           1.37              0.49    0.88
DAILY AVG.       0.04              0.02    0.02
DAYS >= .01        11
DAYS >= .10         6
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.35   12/21 TO 12/21

SNOWFALL (INCHES)
TOTALS           19.4              11.0     8.4
SINCE 7/1        28.6              30.5    -1.9
DAYS >= 1.0         5

DEGREE_DAYS
HEATING TOTAL    1310              1275      35
 SINCE 7/1       3054              3129     -75
COOLING TOTAL       0                 0       0
 SINCE 1/1        448               422      26
.................................................

WIND (MPH)
AVERAGE WIND SPEED              13.3
RESULTANT WIND SPEED/DIRECTION   9/233
HIGHEST WIND SPEED/DIRECTION    41/210    DATE  12/15
HIGHEST GUST SPEED/DIRECTION    51/230    DATE  12/03

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           20
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY          4

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                1     SNOW                       3
LIGHT SNOW               14     SLEET                      0
FOG                      14     FOG W/VIS <= 1/4 MILE      3
HAZE                      6

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

LOOKING AHEAD TO JANUARY 2018...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 35 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 14 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 35
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 14. THE AVERAGE MONTHLY
PRECIPITATION IS 0.51 INCHES.

$$


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