Climatological Report (Monthly)
Issued by NWS Riverton, WY

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CXUS55 KRIW 020915 AAA
CLMRIW

CLIMATE REPORT...AMENDED
NATIONAL WEATHER SERVICE RIVERTON WY
600 PM MDT THU JUN 1 2017

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON REGIONAL AIRPORT
FOR THE MONTH OF MAY 2017...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 2017 WILL BE
AVAILABLE APPROXIMATELY IN JULY 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 DRIER THAN NORMAL IN MAY...

THE AVERAGE TEMPERATURE FOR RIVERTON IN MAY WAS 53.0 DEGREES...
WHICH WAS 0.8 DEGREES BELOW NORMAL. THE WARMEST READING OF THE MONTH
WAS 81 DEGREES ON THE 31ST. THE COLDEST READING WAS 32 DEGREES ON
THE 18TH...SETTING A NEW RECORD. THIS BROKE THE PREVIOUS RECORD OF
35 DEGREES...SET IN 2011.

TOTAL PRECIPITATION FOR THE MONTH WAS 1.4 INCHES...WHICH WAS 81
PERCENT OF NORMAL. THE WETTEST 24 HOUR PERIOD WAS THE 18TH...WHEN
0.74 OF AN INCH FELL. THIS SET A NEW RECORD...BREAKING THE PREVIOUS
RECORD OF 0.54...SET IN 2011. 0.28 OF AN INCH OF PRECIPITATION FELL
ON THE 9TH...BREAKING THE PREVIOUS RECORD OF 0.20...SET IN 2008.
TOTAL SNOWFALL FOR THE MONTH WAS 4.2 INCHES...WHICH BREAKS THE
PREVIOUS RECORD OF 0 INCHES. THE HIGHEST WIND GUST WAS 48 MPH ON THE
24TH.

...THE RIVERTON WY CLIMATE SUMMARY FOR THE MONTH OF MAY 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              93   05/29/2003
 LOW               19   05/09/2002
HIGHEST            81   05/31
LOWEST             32   05/18
AVG. MAXIMUM     65.8              67.2    -1.4
AVG. MINIMUM     40.1              40.5    -0.4
MEAN             53.0              53.8    -0.8
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      1
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.32   2011
 MINIMUM         0.18   2006
TOTALS           1.40              1.72   -0.32
DAILY AVG.       0.05              0.06   -0.01
DAYS >= .01         7
DAYS >= .10         4
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.74   05/18 TO 05/18

SNOWFALL (INCHES)
TOTALS            4.2                MM      MM
SINCE 7/1        66.4                MM      MM
SNOWDEPTH AVG.      0
DAYS >= 1.0         1

DEGREE_DAYS
HEATING TOTAL     367               355      12
 SINCE 7/1       7572              7751    -179
COOLING TOTAL       0                 9      -9
 SINCE 1/1          0                 9      -9
.................................................

WIND (MPH)
AVERAGE WIND SPEED              8.2
RESULTANT WIND SPEED/DIRECTION   2/323
HIGHEST WIND SPEED/DIRECTION    39/280    DATE  05/13
HIGHEST GUST SPEED/DIRECTION    48/250    DATE  05/24

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           18
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY          4

AVERAGE RH (PERCENT)     57

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       4
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                2     SLEET                      0
FOG                       4     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 JUNE 2017...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 72 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 45 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 83
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 53. THE AVERAGE MONTHLY
PRECIPITATION IS 1.28 INCHES.

$$



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