Climatological Report (Monthly)
Issued by NWS

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342
CXUS55 KRIW 020217 CCA
CLMP60

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE LAKE YELLOWSTONE 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 RECORD WET AND COLD MONTH FOR LAKE
YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN NOVEMBER WAS 8
DEGREES...WHICH WAS 5.7 DEGREES BELOW NORMAL.  THIS MAKES IT THE
SECOND COLDEST DECEMBER ON RECORD. THE WARMEST READING OF THE
MONTH WAS 30 DEGREES ON THE 15TH...AND THE COLDEST READING
WAS 28 DEGREES BELOW ZERO ON THE 17TH. THREE RECORD DAILY LOWS WERE
SET LAST MONTH...-18 DEGREES ON THE 16TH...BREAKING 15 BELOW SET IN
2006...28 DEGREES BELOW ON THE 17TH...BREAKING 19 BELOW FROM
2006...AND 23 DEGREES BELOW ON THE 18TH...BREAKING 21 SET IN 2005.

TOTAL PRECIPITATION FOR THE MONTH WAS 3.10 INCHES...WHICH WAS 1.60
INCHES ABOVE NORMAL AND 207 PERCENT OF THE NORMAL. THIS MAKES IT THE
4TH WETTEST DECEMBER ON RECORD.  THE WETTEST 24 HOUR PERIOD OF THE
MONTH WAS THE 15TH...WHEN 0.88 INCHES FELL. A NEW DAILY RECORD OF
0.39 INCHES WAS SET ON THE 4TH...BREAKING THE PREVIOUS RECORD OF
0.20 SET BACK IN 2007...AND ON THE 20TH...0.36 INCHES OF
PRECIPITATION FELL BREAKING THE 2007 RECORD OF .35 INCHES. THE
HIGHEST WIND GUST WAS 29 MPH ON THE 28TH.



...THE LAKE YELLOWSTONE 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              46   12/12/2014
 LOW              -34   12/21/1998
HIGHEST            30   12/15
LOWEST            -28   12/17
AVG. MAXIMUM     19.1
AVG. MINIMUM     -3.1
MEAN              8.0              13.7    -5.7
DAYS MAX >= 90      0
DAYS MAX <= 32     31
DAYS MIN <= 32     31
DAYS MIN <= 0      20

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.15   2007
 MINIMUM         0.37   2000
TOTALS           3.10              1.50    1.60
DAILY AVG.       0.10
DAYS >= .01        21
DAYS >= .10         8
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.90   12/14 TO 12/15

DEGREE_DAYS
HEATING TOTAL    1759              1590     169
 SINCE 7/1       4903              4910      -7
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              3.3
HIGHEST WIND SPEED/DIRECTION    18/260    DATE  12/28
HIGHEST GUST SPEED/DIRECTION    29/290    DATE  12/28

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                       1
LIGHT SNOW                6     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 2017...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 24 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 2 DEGREES.
THE AVERAGE HIGH BY THE END OF THE MONTH IS 25 DEGREES...AND THE
AVERAGE LOW TEMPERATURE IS 1 ABOVE. THE AVERAGE MONTHLY
PRECIPITATION IS 2.11 INCHES.

$$



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