Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 031144 CCA
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
540 AM MDT FRI MAY 3 2019

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF APRIL 2019...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 2019 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

...APRIL WAS WETTER THAN NORMAL FOR LAKE YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN APRIL WAS 31.7
DEGREES...WHICH WAS JUST 0.4 DEGREES ABOVE NORMAL. THE WARMEST
READING OF THE MONTH WAS 55 DEGREES ON THE 19TH...AND THE COLDEST
WAS 5 DEGREES ON THE 12TH. A RECORD LOW WAS SET ON THE 29TH WITH 7
DEGREES...BREAKING THE PREVIOUS RECORD OF 8 DEGREES SET IN 2005.

TOTAL PRECIPITATION FOR THE MONTH WAS 3.51 INCHES...WHICH WAS 169
PERCENT OF NORMAL. THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE
9TH WHEN 0.61 INCHES FELL. THIS ALSO BROKE THE PREVIOUS RECORD OF
0.42 INCHES SET IN 2007. THE HIGHEST WIND GUST FOR THE MONTH WAS 38
MPH ON THE 27TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF APRIL
2019...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2019

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              65   04/29/2007
 LOW              -17   04/02/2008
HIGHEST            55   04/19
LOWEST              5   04/12
AVG. MAXIMUM     41.0
AVG. MINIMUM     22.4
MEAN             31.5              31.3     0.2
DAYS MAX >= 90      0
DAYS MAX <= 32      4
DAYS MIN <= 32     28
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.59   2011
 MINIMUM         0.76   2008
TOTALS           3.51              2.08    1.43
DAILY AVG.       0.12
DAYS >= .01        23
DAYS >= .10        12
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.61   04/09 TO 04/09

DEGREE_DAYS
HEATING TOTAL     934              1012     -78
 SINCE 7/1      10508             10251     257
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.9
HIGHEST WIND SPEED/DIRECTION    22/260    DATE  04/27
HIGHEST GUST SPEED/DIRECTION    38/260    DATE  04/27

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)     72

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                        3
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 2019...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 47 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 24. 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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