Climatological Report (Monthly)
Issued by NWS

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000
CXUS55 KRIW 011704
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1000 AM MST SAT FEB 1 2020

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF JANUARY 2020...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF JANUARY 2020 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 AND WETTER THAN NORMAL FOR LAKE YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN JANUARY WAS 15.1
DEGREES. THIS WAS 2.4 DEGREES ABOVE NORMAL...MAKING IT THE 6TH
WARMEST JANUARY ON RECORD. THE WARMEST READING OF THE MONTH WAS 31
DEGREES ON THE 21ST AND 26TH. THE COLDEST WAS 17 DEGREES BELOW ZERO
ON THE 10TH...WHICH ALSO BROKE THE 2011 DAILY RECORD OF 14 BELOW. NO
OTHER DAILY TEMPERATURE RECORDS WERE BROKEN.

TOTAL PRECIPITATION FOR THE MONTH WAS 2.81 INCHES...WHICH WAS 133
PERCENT OF NORMAL. IT WAS THE 2ND WETTEST JANUARY ON RECORD. THE
WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE 16TH WITH 0.35 INCHES.
THIS ALSO BROKE THE 1999 RECORD OF 0.33 INCHES. THE 1ST HAD 0.35
INCHES BREAKING THE 2008 RECORD OF 0.33 INCHES...AND THE 17TH HAD
0.23 INCHES BREAKING THE 2019 RECORD OF 0.2. THE HIGHEST WIND GUST
FOR THE MONTH WAS 37 MPH ON THE 13TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF JANUARY
2020...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2020

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            31   01/26
                        01/21
LOWEST            -17   01/10
AVG. MAXIMUM     23.9
AVG. MINIMUM      6.3
MEAN             15.1              12.7     2.4
DAYS MAX >= 90      0
DAYS MAX <= 32     31
DAYS MIN <= 32     31
DAYS MIN <= 0      11

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.69   2017
 MINIMUM         0.14   2009
TOTALS           2.81R             2.11    0.70
DAILY AVG.       0.09
DAYS >= .01        28
DAYS >= .10        11
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.35   01/16 TO 01/16
                        01/01 TO 01/01

DEGREE_DAYS
HEATING TOTAL    1538              1621     -83
 SINCE 7/1       6801              6531     270
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.3
HIGHEST WIND SPEED/DIRECTION    16/270    DATE  01/02
HIGHEST GUST SPEED/DIRECTION    37/250    DATE  01/13

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                7     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 2020...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 25 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 1 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 32
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 5 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 1.41 INCHES.

$$



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