Climatological Report (Monthly)
Issued by NWS

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866
CXUS55 KRIW 020006
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
606 PM MDT FRI MAY 1 2015

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF APRIL 2015...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 2015 WILL BE
AVAILABLE APPROXIMATELY IN JUNE 2015 FROM THE NATIONAL CLIMATIC
DATA CENTER (WWW.NCDC.NOAA.GOV). UNOFFICIAL ASOS DAILY SUMMARIES ARE
ONLINE AT WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW..

...APRIL WAS MUCH DRIER AND SLIGHTLY WARMER THAN AVERAGE AT LAKE
YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN APRIL WAS 31.8
DEGREES...WHICH WAS 0.5 DEGREES ABOVE NORMAL. THE WARMEST READING
FOR THE MONTH WAS 62 DEGREES ON THE 29TH. THE COLDEST READING WAS
ZERO ON THE 3RD. ON THE 14TH...THE RECORD DAILY HIGH TEMPERATURE OF
54 DEGREES SET IN 2008 WAS TIED. DAILY RECORDS FOR THIS SITE ONLY
DATE BACK TO 1998.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.99 INCHES...WHICH WAS
48 PERCENT OF NORMAL. THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS ON
THE 5TH AND 6TH WHEN 0.27 INCHES OF PRECIPITATION FELL. THE HIGHEST
WIND GUST WAS 32 MPH FROM THE SOUTHWEST ON THE 11TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              65   04/29/2007
 LOW              -17   04/02/2008
HIGHEST            62   04/29
LOWEST              0   04/03
AVG. MAXIMUM     44.4
AVG. MINIMUM     19.2
MEAN             31.8              31.3     0.5
DAYS MAX >= 90      0
DAYS MAX <= 32      1
DAYS MIN <= 32     30
DAYS MIN <= 0       1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.59   2011
 MINIMUM         0.76   2008
TOTALS           0.99              2.08   -1.09
DAILY AVG.       0.03
DAYS >= .01        14
DAYS >= .10         4
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.27   04/05 TO 04/06

DEGREE_DAYS
HEATING TOTAL     988              1012     -24
 SINCE 7/1       9726             10251    -525
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.6
HIGHEST WIND SPEED/DIRECTION    17/280    DATE  04/12
HIGHEST GUST SPEED/DIRECTION    32/230    DATE  04/11

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)     63

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 MAY 2015...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 44 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 22 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 55
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 31. MAY IS THE WETTEST
MONTH OF THE YEAR WITH AVERAGE MONTHLY PRECIPITATION OF 2.27 INCHES.

$$







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