Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 011957 AAA
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1250 PM MST THU JAN 1 2015

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF DECEMBER 2014...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF DECEMBER 2014 WILL BE
AVAILABLE APPROXIMATELY IN FEBRUARY 2015 FROM THE NATIONAL CLIMATIC
DATA CENTER (HTTP://WWW.NCDC.NOAA.GOV/OL/CLIMATEDATA.HTML).
UNOFFICIAL ASOS DAILY SUMMARIES ARE AVAILABLE ON THE INTERNET AT
HTTP://WWW.CRH.NOAA.GOV/RIW/CLIMATE/...

...LAKE YELLOWSTONE WAS WARMER AND WETTER THAN AVERAGE FOR
DECEMBER...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN DECEMBER WAS 18.0
DEGREES...WHICH WAS 4.3 DEGREES ABOVE NORMAL. THIS MAKES IT THE
WARMEST DECEMBER SINCE RECORDS STARTED IN 1998. THE WARMEST DAILY
HIGH FOR THE MONTH WAS 46 DEGREES ON THE 12TH...WHICH IS NOT ONLY A
DAILY RECORD...BUT ALSO THE WARMEST DECEMBER DAILY TEMPERATURE SINCE
1998. THE COLDEST READING WAS 27 BELOW ON THE 30TH. THERE WERE EIGHT
DAILY HIGH RECORDS BROKEN IN DECEMBER...WITH 36 DEGREES ON THE
4TH...37 ON THE 5TH...34 DEGREES ON THE 6TH...38 DEGREES ON THE
8TH...39 ON THE 9TH...36 DEGREES ON THE 10TH...41 DEGREES ON THE
11TH...AND 26 DEGREES ON THE 12TH. THERE WERE ALSO THREE RECORD LOW
TEMPERATURES SET...WITH 16 BELOW ON THE 29TH...27 BELOW ON THE
30TH...AND 22 BELOW TYING THE RECORD ON THE 31ST.

TOTAL PRECIPITATION FOR THE MONTH WAS 2.50 INCHES...WHICH WAS 167
PERCENT OF NORMAL. THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE
24TH AND 25TH...WHEN 0.64 OF AN INCH OF PRECIPITATION FELL. THE
HIGHEST WIND GUST WAS 34 MPH...WHICH OCCURRED ON THE 21ST.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER
2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2014

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              46   12/12/2014
 LOW              -34   12/21/1998
HIGHEST            46R  12/12
LOWEST            -27   12/30
AVG. MAXIMUM     27.0
AVG. MINIMUM      9.0
MEAN             18.0              13.7     4.3
DAYS MAX >= 90      0
DAYS MAX <= 32     21
DAYS MIN <= 32     31
DAYS MIN <= 0       7

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.15   2007
 MINIMUM         0.37   2000
TOTALS           2.50              1.50    1.00
DAILY AVG.       0.08
DAYS >= .01        21
DAYS >= .10        10
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.64   12/24 TO 12/25

DEGREE_DAYS
HEATING TOTAL    1448              1590    -142
 SINCE 7/1       4775              4910    -135
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.3
HIGHEST WIND SPEED/DIRECTION    21/270    DATE  12/21
HIGHEST GUST SPEED/DIRECTION    34/310    DATE  12/21

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)     80

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                       0
LIGHT SNOW                0     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 2015...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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