Climatological Report (Monthly)
Issued by NWS

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377
CXUS55 KRIW 020153
CLMGEY

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
653 PM MST SUN JAN 1 2017

..PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE SOUTH BIG HORN COUNTY
AIRPORT NEAR GREYBULL 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 WAS A COLD AND RECORD DRY MONTH FOR GREYBULL...

THE AVERAGE TEMPERATURE FOR GREYBULL IN NOVEMBER WAS 11.6 DEGREES...
WHICH WAS 6.1 DEGREES BELOW NORMAL.  THE WARMEST READING OF THE MONTH
WAS 40 DEGREES ON THE 3RD AND 4TH...AND THE COLDEST WAS 25 DEGREES
BELOW ZERO ON THE 18TH. SIX RECORD LOWS OCCURRED LAST MONTH...23
DEGREES BELOW ZERO ON THE 17TH...BREAKING 14 BELOW SET BACK IN
2008...25 DEGREES BELOW ZERO ON THE 18TH...BREAKING 10 BELOW SET
BACK IN 2008...16 DEGREES BELOW ZERO ON THE 19TH...BREAKING 12 BELOW
SET BACK IN 2005...13 DEGREES BELOW ZERO ON THE 27TH...BREAKING 8
BELOW SET BACK IN 2009...10 DEGREES BELOW ZERO ON THE 28TH...BREAKING
8 BELOW SET BACK IN 2009...13 DEGREES BELOW ZERO ON THE
29TH...BREAKING 11 BELOW SET BACK IN 2012.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.03...WHICH WAS 0.25 INCHES
BELOW NORMAL FOR THE MONTH OR ONLY 11 PERCENT OF NORMAL. THE WETTEST
24 HOUR PERIOD WAS THE 16TH...WHEN 0.02 INCHES FELL...THE HIGHEST
WIND GUST WAS 48 MPH ON THE 5TH.


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

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              63   12/11/2004
 LOW              -25   12/18/2016
HIGHEST            40   12/04
                        12/03
LOWEST            -25R  12/18
AVG. MAXIMUM     22.3              29.1    -6.8
AVG. MINIMUM      0.9               6.3    -5.4
MEAN             11.6              17.7    -6.1
DAYS MAX >= 90      0
DAYS MAX <= 32     23
DAYS MIN <= 32     31
DAYS MIN <= 0      15

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         0.49   1999
 MINIMUM         0.01   2015
TOTALS           0.03              0.28   -0.25
DAILY AVG.       0.00              0.01   -0.01
DAYS >= .01         2
DAYS >= .10         0
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.02   12/16 TO 12/16
                        12/15 TO 12/16
                        12/16 TO 12/16

DEGREE_DAYS
HEATING TOTAL    1649              1466     183
 SINCE 7/1       3024              3323    -299
COOLING TOTAL       0                 0       0
 SINCE 1/1        887               669     218
.................................................

WIND (MPH)
AVERAGE WIND SPEED              5.8
HIGHEST WIND SPEED/DIRECTION    37/330    DATE  12/25
HIGHEST GUST SPEED/DIRECTION    48/320    DATE  12/05

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           20
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     71

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                       2
LIGHT SNOW                8     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      2
HAZE                      4

-  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 28 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 4 DEGREES.
THE AVERAGE HIGH BY THE END OF THE MONTH IS 30 DEGREES...AND THE
AVERAGE LOW TEMPERATURE IS 7 ABOVE. THE AVERAGE MONTHLY
PRECIPITATION IS 0.23 INCHES.

$$



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