Climatological Report (Monthly)
Issued by NWS Riverton, WY

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CXUS55 KRIW 011214
CLMRIW

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON REGIONAL AIRPORT
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...

...RIVERTON WAS SLIGHTLY COOLER AND MUCH WETTER THAN NORMAL IN
APRIL...

THE AVERAGE TEMPERATURE FOR RIVERTON IN APRIL WAS 43.1 DEGREES...
WHICH WAS 1.1 DEGREES BELOW NORMAL. THE WARMEST READING OF THE MONTH
WAS 75 DEGREES ON THE 13TH...SETTING A NEW RECORD HIGH. THIS TIED
THE PREVIOUS RECORD...SET IN 2000. THE COLDEST READING WAS 21
DEGREES ON THE 29TH...SETTING A NEW RECORD. THIS BROKE THE PREVIOUS
RECORD OF 23 DEGREES...SET IN 1996. A RECORD LOW OF 24 DEGREES WAS
SET ON THE 30TH...BREAKING THE PREVIOUS RECORD OF 27 DEGREES...SET
IN 2009.

TOTAL PRECIPITATION FOR THE MONTH WAS 3.19 INCHES...MAKING IT THE
2ND WETTEST APRIL ON RECORD. THE WETTEST 24 HOUR PERIOD WAS THE
28TH...WHEN 0.87 OF AN INCH FELL. THIS EASILY SET A NEW
RECORD...BREAKING THE PREVIOUS RECORD OF 0.21...SET IN 2005. 0.03 OF
AN INCH OF PRECIPITATION FELL ON THE 3RD...BREAKING THE PREVIOUS
RECORD OF 0.01...SET IN 2010. 0.35 OF AN INCH OF PRECIPITATION FELL
ON THE 4TH...BREAKING THE PREVIOUS RECORD OF 0.10...SET IN 1998.
TOTAL SNOWFALL FOR THE MONTH WAS 14.5 INCHES...WHICH IS 238 PERCENT
OF NORMAL. THIS MAKES IT THE 4TH SNOWIEST APRIL ON RECORD. THE
HIGHEST WIND GUST WAS 45 MPH ON THE 13TH.

...THE RIVERTON WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1995 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              85   04/24/2012
 LOW                4   04/10/2013
                        04/11/1997
                        01/12/1963
HIGHEST            75   04/13
LOWEST             21   04/29
AVG. MAXIMUM     54.2              57.1    -2.9
AVG. MINIMUM     31.8              31.3     0.5
MEAN             43.1              44.2    -1.1
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     16
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.31   2016
 MINIMUM         0.10   2007
TOTALS           3.19              1.30    1.89
DAILY AVG.       0.11              0.04    0.07
DAYS >= .01        13
DAYS >= .10         9
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.87   04/28 TO 04/28

SNOWFALL (INCHES)
TOTALS           14.5                MM      MM
SINCE 7/1        62.2                MM      MM
SNOWDEPTH AVG.      0
DAYS >= 1.0         3

DEGREE_DAYS
HEATING TOTAL     627               624       3
 SINCE 7/1       7205              7396    -191
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              9.5
RESULTANT WIND SPEED/DIRECTION   3/292
HIGHEST WIND SPEED/DIRECTION    38/200    DATE  04/13
HIGHEST GUST SPEED/DIRECTION    45/200    DATE  04/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           15
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     62

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       5
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                3     SNOW                       3
LIGHT SNOW                7     SLEET                      0
FOG                      15     FOG W/VIS <= 1/4 MILE      6
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 62 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 36 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 72
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 45. THE AVERAGE MONTHLY
PRECIPITATION IS 1.72 INCHES.

$$



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