Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 012206
CLMGEY

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE SOUTH BIG HORN COUNTY
AIRPORT NEAR GREYBULL FOR THE MONTH OF DECEMBER 2017...

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

...GREYBULL SAW SLIGHTLY COLDER THAN NORMAL CONDITIONS IN DECEMBER...

THE AVERAGE TEMPERATURE FOR GREYBULL FOR THE MONTH WAS 18.2
DEGREES...WHICH WAS 0.5 DEGREES ABOVE NORMAL. THE WARMEST READING
OF THE MONTH WAS 51 DEGREES ON THE 2ND. THE COLDEST READING WAS -20
DEGREES ON THE 24TH.  THIS BROKE THE PREVIOUS RECORD OF -18 SET IN
2008.  A RECORD LOW WAS ALSO SET ON THE 27TH WHEN -17 DEGREES BROKE
-13 DEGREES SET IN 2016.  THIS WAS THE 9TH COLDEST DECEMBER ON RECORD
FOR GREYBULL.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.22....WHICH WAS 79 PERCENT
OF NORMAL. THE WETTEST 24 HOUR PERIOD WAS THE 16TH...WHEN 0.19 INCHES
FELL. THIS BROKE THE PREVIOUS RECORD OF A TRACE...SET IN 2005. A
RECORD WAS ALSO SET ON THE 25TH WHEN A TRACE TIED A TRACE FROM 2009.
THE HIGHEST WIND GUST WAS 56 MPH ON THE 4TH.

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

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              63   12/11/2004
 LOW              -25   12/18/2016
HIGHEST            51   12/02
LOWEST            -20   12/24
AVG. MAXIMUM     29.8              29.1     0.7
AVG. MINIMUM      6.6               6.3     0.3
MEAN             18.2              17.7     0.5
DAYS MAX >= 90      0
DAYS MAX <= 32     15
DAYS MIN <= 32     31
DAYS MIN <= 0       7

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         0.49   1999
 MINIMUM         0.01   2015
TOTALS           0.22              0.28   -0.06
DAILY AVG.       0.01              0.01    0.00
DAYS >= .01         3
DAYS >= .10         1
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.19   12/16 TO 12/16

DEGREE_DAYS
HEATING TOTAL    1442              1466     -24
 SINCE 7/1       3219              3323    -104
COOLING TOTAL       0                 0       0
 SINCE 1/1        824               669     155
.................................................

WIND (MPH)
AVERAGE WIND SPEED              5.8
HIGHEST WIND SPEED/DIRECTION    45/330    DATE  12/04
HIGHEST GUST SPEED/DIRECTION    56/330    DATE  12/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           16
NUMBER OF DAYS PC             11
NUMBER OF DAYS CLOUDY          4

AVERAGE RH (PERCENT)     73

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                9     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      0
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 2018...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 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 0.23 INCHES.

$$



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