Climatological Report (Monthly)
Issued by NWS

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095
CXUS55 KRIW 012322
CLMP60

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE LAKE YELLOWSTONE 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

...DECEMBER FOR LAKE YELLOWSTONE WAS WETTER THAN NORMAL...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN DECEMBER WAS 13.4
DEGREES...WHICH WAS 0.3 DEGREES BELOW NORMAL. THE WARMEST READING OF
THE MONTH WAS 35 DEGREES ON THE 3RD. THE COLDEST READING WAS -22
DEGREES ON THE 24TH WHICH BROKE THE PREVIOUS RECORD OF -16 DEGREES
SET IN 2011.

TOTAL PRECIPITATION FOR THE MONTH WAS 2.25 INCHES...WHICH WAS 150
PERCENT OF NORMAL OR 0.75 INCHES ABOVE NORMAL. THIS MAKES IT THE
10TH WETTEST DECEMBER ON RECORD. THE WETTEST 24 HOUR PERIOD OF THE
MONTH WAS THE 20TH...WHEN 0.44 INCHES FELL.  THIS BREAKS THE
PREVIOUS RECORD OF 0.36 SET IN 2016. ANOTHER RECORD WAS SET ON THE
16TH WHEN 0.24 INCHES FELL BREAKING 0.12 INCHES SET IN 2009.
THE HIGHEST WIND GUST WAS 32 MPH ON THE 30TH.


...THE LAKE YELLOWSTONE 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              46   12/12/2014
 LOW              -34   12/21/1998
HIGHEST            35   12/03
LOWEST            -22   12/24
AVG. MAXIMUM     23.5
AVG. MINIMUM      3.2
MEAN             13.4              13.7    -0.3
DAYS MAX >= 90      0
DAYS MAX <= 32     29
DAYS MIN <= 32     31
DAYS MIN <= 0      15

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.15   2007
 MINIMUM         0.37   2000
TOTALS           2.25              1.50    0.75
DAILY AVG.       0.07
DAYS >= .01        16
DAYS >= .10         8
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.44   12/20 TO 12/20

DEGREE_DAYS
HEATING TOTAL    1594              1590       4
 SINCE 7/1       4963              4910      53
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.6
HIGHEST WIND SPEED/DIRECTION    18/280    DATE  12/30
HIGHEST GUST SPEED/DIRECTION    32/310    DATE  12/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           31
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     83

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                0     SNOW                       2
LIGHT SNOW                5     SLEET                      0
FOG                       0     FOG W/VIS <= 1/4 MILE      0
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 2018...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 24 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 2 DEGREES. THE AVERAGE HIGH TEMPERATURE BY THE END OF THE MONTH
IS 25 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 1. THE AVERAGE
MONTHLY PRECIPITATION IS 2.11 INCHES.

$$



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