Climatological Report (Monthly)
Issued by NWS Riverton, WY

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CXUS55 KRIW 010922
CLMRIW

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
201 AM MDT MON JUN 1 2015

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON REGIONAL AIRPORT
FOR THE MONTH OF MAY 2015...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 2015 WILL BE
AVAILABLE APPROXIMATELY IN JULY 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..

...MAY WAS COOLER AND MUCH WETTER THAN NORMAL IN RIVERTON....

THE AVERAGE MAY TEMPERATURE IN RIVERTON WAS 50.9 DEGREES...WHICH WAS
2.9 DEGREES BELOW NORMAL. THIS MAKES IT THE 4TH COLDEST MAY SINCE
RECORDS BEGAN IN 1996. THE COLDEST CAME IN 2010...WITH AN AVERAGE OF
47.0 DEGREES. THE WARMEST READING OF THE MONTH WAS 79 DEGREES ON THE
31ST...AND THE COLDEST READING WAS 29 ON THE 11TH. THERE WERE NO
TEMPERATURE RECORDS DURING THE MONTH OF MAY.

TOTAL PRECIPITATION FOR THE MONTH WAS 4.55 INCHES...WHICH WAS 265
PERCENT OF NORMAL. THIS MAKES IT THE 3RD WETTEST MAY SINCE RECORDS
BEGAN IN 1996. THE WETTEST CAME IN 2011...WHEN 5.32 INCHES FELL. THE
WETTEST 24 HOUR PERIOD OCCURRED ON THE 24TH AND 25TH WHEN 1.09
INCHES OF PRECIPITATION FELL. NEW DAILY PRECIPITATION RECORDS FOR
THE MONTH INCLUDE...0.18 INCHES ON THE 14TH...0.18 INCHES ON THE
21ST...0.63 INCHES ON THE 23RD...AND 1.06 INCHES ON THE 24TH. TOTAL
SNOWFALL FOR THE MONTH OF MAY WAS 0.5 INCHES. A DAILY SNOWFALL
RECORD OF 0.2 INCHES WAS TIED ON THE 9TH. THE HIGHEST WIND GUST WAS
44 MPH ON THE 3RD.

...THE RIVERTON WY CLIMATE SUMMARY FOR THE MONTH OF MAY 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1995 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              93   05/29/2003
 LOW               19   05/09/2002
HIGHEST            79   05/31
LOWEST             29   05/11
AVG. MAXIMUM     61.5              67.2    -5.7
AVG. MINIMUM     40.3              40.5    -0.2
MEAN             50.9              53.8    -2.9
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      3
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.32   2011
 MINIMUM         0.18   2006
TOTALS           4.55              1.72    2.83
DAILY AVG.       0.15              0.06    0.09
DAYS >= .01        18
DAYS >= .10        12
DAYS >= .50         3
DAYS >= 1.00        2
GREATEST
 24 HR. TOTAL    1.09   05/24 TO 05/25
 STORM TOTAL       MM
 (MM/DD(HH))

SNOWFALL (INCHES)
TOTALS            0.5                MM      MM
SINCE 7/1        39.1                MM      MM
SNOWDEPTH AVG.      0
DAYS >= 1.0         0

DEGREE_DAYS
HEATING TOTAL     428               355      73
 SINCE 7/1       7186              7751    -565
COOLING TOTAL       0                 9      -9
 SINCE 1/1          0                 9      -9
.................................................

WIND (MPH)
AVERAGE WIND SPEED              8.2
RESULTANT WIND SPEED/DIRECTION   3/020
HIGHEST WIND SPEED/DIRECTION    35/230    DATE  05/27
HIGHEST GUST SPEED/DIRECTION    44/240    DATE  05/03

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           14
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY         11

AVERAGE RH (PERCENT)     66

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              7     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       4
LIGHT RAIN               18     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       1
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                      12     FOG W/VIS <= 1/4 MILE      1
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 2015...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 74 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 44 DEGREES. BY THE END OF THE MONTH...THE AVERAGE HIGH
TEMPERATURE IS 88 DEGREES AND THE AVERAGE LOW TEMPERATURE IS 56. THE
AVERAGE MONTHLY PRECIPITATION IS 1.28 INCHES.

$$






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