Climatological Report (Monthly)
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190
CXUS55 KRIW 011144
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
335 AM MDT MON MAY 1 2017

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE LAKE YELLOWSTONE FOR
THE MONTH OF APRIL 2017...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 2017 WILL BE
AVAILABLE APPROXIMATELY IN JUNE 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

...LAKE YELLOWSTONE WAS SLIGHTLY COOLER AND MUCH WETTER IN APRIL...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN APRIL WAS 29.5
DEGREES...WHICH WAS 1.8 DEGREES BELOW NORMAL. THE WARMEST READING OF
THE MONTH WAS 56 DEGREES ON THE 13TH...SETTING A NEW RECORD HIGH.
THIS BROKE THE PREVIOUS RECORD OF 54 DEGREES...SET IN 2004. A RECORD
HIGH OF 51 DEGREES OCCURRED ON THE 6TH...BREAKING THE PREVIOUS
RECORD OF 50 DEGREES...SET IN 2004. THE COLDEST READING WAS 5
DEGREES ON THE 10TH.

TOTAL PRECIPITATION FOR THE MONTH WAS 3.39 INCHES...WHICH WAS 163
PERCENT OF NORMAL. THIS MAKES IT THE 4TH WETTEST APRIL ON RECORD.
THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE 26TH...WHEN 0.88
INCHES FELL...AND SETTING A NEW RECORD. THIS BROKE THE PREVIOUS
RECORD OF 0.71...SET IN 2003. THE HIGHEST WIND GUST WAS 26 MPH ON
THE 17TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 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              65   04/29/2007
 LOW              -17   04/02/2008
HIGHEST            56   04/13
LOWEST              5   04/10
AVG. MAXIMUM     40.2
AVG. MINIMUM     18.9
MEAN             29.5              31.3    -1.8
DAYS MAX >= 90      0
DAYS MAX <= 32      3
DAYS MIN <= 32     30
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.59   2011
 MINIMUM         0.76   2008
TOTALS           3.39              2.08    1.31
DAILY AVG.       0.11
DAYS >= .01        22
DAYS >= .10        10
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.88   04/26 TO 04/26

DEGREE_DAYS
HEATING TOTAL    1054              1012      42
 SINCE 7/1      10214             10251     -37
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.8
HIGHEST WIND SPEED/DIRECTION    18/290    DATE  04/15
HIGHEST GUST SPEED/DIRECTION    26/250    DATE  04/17

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           30
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                2     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
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 MAY 2017...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 47 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 24 DEGREES. THE AVERAGE HIGH TEMPERATURE BY THE END OF THE MONTH
IS 56 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 32. THE AVERAGE
MONTHLY PRECIPITATION IS 2.27 INCHES.

$$



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