Climatological Report (Monthly)
Issued by NWS Riverton, WY

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000
CXUS55 KRIW 130514 CCA
CLMRIW

CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE RIVERTON WY
318 PM MST SUN JAN 1 2017

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON REGIONAL AIRPORT
FOR THE MONTH OF DECEMBER 2016...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF DECEMBER 2016 WILL BE
AVAILABLE APPROXIMATELY IN FEBRUARY 2017 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

...DECEMBER SET RECORD SNOW AND PRECIPITATION AMOUNTS...

THE AVERAGE TEMPERATURE FOR RIVERTON IN DECEMBER WAS 15.4 DEGREES...
WHICH WAS 4.4 DEGREES BELOW NORMAL. THE WARMEST READING OF THE MONTH
WAS 44 DEGREES ON THE 4TH...AND THE COLDEST WAS 23 DEGREES BELOW
ZERO ON THE 17TH. TWO NEW DAILY RECORD LOWS WERE SET...23 DEGREES
BELOW ZERO ON THE 17TH...BREAKING 5 BELOW SET BACK IN 2008...AND 18
DEGREES BELOW ZERO ON THE 18TH...BREAKING 11 BELOW SET BACK IN 1996.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.77 OF AN INCH...WHICH WAS
0.45 INCHES ABOVE NORMAL FOR THE MONTH OR 241 PERCENT OF THE NORMAL.
THIS MAKES IT THE WETTEST DECEMBER ON RECORD SINCE 1996. THE WETTEST
24 HOUR PERIOD WAS THE 25TH...WHEN 0.49 OF AN INCH FELL. TWO DAILY
PRECIPITATION RECORDS FELL LAST MONTH...0.22 INCHES ON THE
16TH...BREAKING A TRACE THAT FELL BACK IN 2005...AND 0.49 INCHES
THAT FELL ON THE 25TH...BREAKING 0.15 THAT FELL IN 2014. TOTAL
SNOWFALL FOR THE MONTH WAS 12.6 INCHES...WHICH IS 263 PERCENT OF
NORMAL. MAKING IT THE SECOND SNOWIEST DECEMBER ON RECORD...ALSO
SINCE 1996.

THE HIGHEST WIND GUST WAS 49 MPH ON THE 3RD.

...THE RIVERTON WY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1995 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              60   12/02/2012
 LOW              -29   12/21/1998
HIGHEST            44   12/04
LOWEST            -23   12/17
AVG. MAXIMUM     26.6              31.8    -5.2
AVG. MINIMUM      4.1               7.8    -3.7
MEAN             15.4              19.8    -4.4
DAYS MAX >= 90      0
DAYS MAX <= 32     20
DAYS MIN <= 32     31
DAYS MIN <= 0      10

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         0.65   2014
 MINIMUM            T   1998
                        2001
TOTALS           0.77R             0.32    0.45
DAILY AVG.       0.02              0.01    0.01
DAYS >= .01         6
DAYS >= .10         2
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.49   12/25 TO 12/25
                        12/24 TO 12/25
                        12/25 TO 12/25
 STORM TOTAL       MM
 (MM/DD(HH))

SNOWFALL (INCHES)
TOTALS           12.6                MM      MM
SINCE 7/1        17.0                MM      MM
SNOW DEPTH AVG.      2
DAYS >= 1.0         2

DEGREE_DAYS
HEATING TOTAL    1530              1401     129
 SINCE 7/1       3126              3317    -191
COOLING TOTAL       0                 0       0
 SINCE 1/1        605               494     111
.................................................

WIND (MPH)
AVERAGE WIND SPEED              7.2
RESULTANT WIND SPEED/DIRECTION   3/295
HIGHEST WIND SPEED/DIRECTION    40/300    DATE  12/03
HIGHEST GUST SPEED/DIRECTION    49/300    DATE  12/03

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.20
NUMBER OF DAYS FAIR           26
NUMBER OF DAYS PC              2
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     67

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                2     SNOW                       2
LIGHT SNOW                9     SLEET                      0
FOG                       7     FOG W/VIS <= 1/4 MILE      3
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 2017...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 31 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 10 ABOVE. THE AVERAGE
MONTHLY PRECIPITATION IS 0.24 INCHES.

$$



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