Climatological Report (Monthly)
Issued by NWS

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000
CXUS55 KRIW 012004
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1257 PM MST THU FEB 1 2018

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE LAKE YELLOWSTONE FOR
THE MONTH OF JANUARY 2018...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF JANUARY 2018 WILL BE
AVAILABLE APPROXIMATELY IN 60 DAYS FROM THE NATIONAL CENTERS FOR
ENVIRONMENTAL INFORMATION (HTTP://WWW.NCDC.NOAA.GOV/CDO-
WEB/DATASETS). UNOFFICIAL ASOS DAILY SUMMARIES ARE AVAILABLE ON THE
INTERNET AT HTTP://WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW

...JANUARY WAS WARMER THAN NORMAL FOR LAKE YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN JANUARY WAS 15.8
DEGREES...WHICH WAS 3.1 DEGREES ABOVE NORMAL. THIS MAKES IT THE 4TH
WARMEST JANUARY SINCE 1998. THE WARMEST READING OF THE MONTH WAS 36
DEGREES ON THE 18TH...AND THE COLDEST READING WAS -17 DEGREES ON THE
21ST. FOUR DAILY HIGH TEMPERATURE RECORDS FELL DURING THE MONTH
INCLUDING...31 DEGREES ON THE 10TH...36 DEGREES ON THE 18TH...35
DEGREES ON THE 29TH...AND 34 DEGREES ON THE 30TH.

TOTAL PRECIPITATION FOR THE MONTH WAS 2.11 INCHES...WHICH WAS 100
PERCENT OF NORMAL. THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE
19TH...WHEN 0.60 INCHES FELL. THIS ALSO BREAKS THE PREVIOUS DAILY
RECORD OF 0.28 SET BACK IN 1998. ANOTHER PRECIPITATION RECORD WAS
SET ON THE 25TH WHEN 0.11 INCHES FELL BREAKING 0.10 INCHES SET IN
2011.  THE HIGHEST WIND GUST WAS 35 MPH ON THE 30TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF JANUARY
2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              42   01/27/2015
                        01/20/2005
                        01/16/1974
 LOW              -36   01/12/2007
HIGHEST            36   01/18
LOWEST            -17   01/21
AVG. MAXIMUM     26.6
AVG. MINIMUM      5.1
MEAN             15.8              12.7     3.1
DAYS MAX >= 90      0
DAYS MAX <= 32     24
DAYS MIN <= 32     31
DAYS MIN <= 0      11

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.69   2017
 MINIMUM         0.14   2009
TOTALS           2.11              2.11    0.00
DAILY AVG.       0.07
DAYS >= .01        17
DAYS >= .10         5
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.60   01/19 TO 01/19

DEGREE_DAYS
HEATING TOTAL    1514              1621    -107
 SINCE 7/1       6477              6531     -54
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.2
HIGHEST WIND SPEED/DIRECTION    18/250    DATE  01/30
HIGHEST GUST SPEED/DIRECTION    35/260    DATE  01/30

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                       0
LIGHT SNOW                3     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 FEBRUARY 2018...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 25 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 1 ABOVE. THE AVERAGE HIGH TEMPERATURE BY THE END OF THE MONTH IS
32 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 5 ABOVE. THE AVERAGE
MONTHLY PRECIPITATION IS 1.41 INCHES.

$$



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