Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 012101
CLMCPR

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
255 PM MDT TUE JUN 01 2021

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR CASPER-NATRONA COUNTY
INTERNATIONAL AIRPORT NEAR CASPER FOR THE MONTH OF MAY 2021...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 2021 WILL BE AVAILABLE
IN APPROXIMATELY 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

...CASPER WAS DRIER AND SLIGHTLY COOLER THAN NORMAL IN MAY...

THE AVERAGE TEMPERATURE FOR CASPER IN MAY WAS 51.3 DEGREES. THIS WAS
0.7 DEGREES BELOW NORMAL. THE WARMEST READING OF THE MONTH WAS 83
DEGREES ON THE 7TH AND 20TH. THE COLDEST READING OF THE MONTH WAS 25
DEGREES ON THE 9TH. NO TEMPERATURE RECORDS WERE BROKEN IN MAY.

TOTAL PRECIPITATION AT CASPER FOR THE MONTH WAS 0.60 INCHES...WHICH
WAS 30 PERCENT OF NORMAL AND MAKES IT THE 8TH DRIEST MAY ON RECORD
SINCE 1948. THE WETTEST 24-HOUR PERIOD DURING THE MONTH WAS THE
15TH... WHEN 0.29 INCHES FELL. THERE WERE NO PRECIPITATION OR
SNOWFALL RECORDS BROKEN IN MAY.

THE MONTHLY SNOWFALL TOTAL WAS A TRACE. THIS IS 2.6 INCHES BELOW
NORMAL. THIS DID BRING THE SEASONAL SNOWFALL TO 100.3 INCHES...SINCE
JULY 1ST. THE HIGHEST WIND GUST WAS 60 MPH FROM THE WEST ON THE 28TH.

...THE CASPER WY CLIMATE SUMMARY FOR THE MONTH OF MAY 2021...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1939 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             95   05/29/2003
 LOW              16   05/12/1953
HIGHEST           83   05/07
                       05/20
LOWEST            25   05/09
AVG. MAXIMUM    66.7               66.8    -0.1
AVG. MINIMUM    35.9               37.1    -1.2
MEAN            51.3               52.0    -0.7
DAYS MAX >= 90     0
DAYS MAX <= 32     0
DAYS MIN <= 32    10
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        6.46   1978
 MINIMUM        0.30   2020
TOTALS          0.60               2.21   -1.61     0.30
DAILY AVG.      0.02               0.07   -0.05
DAYS >= .01        9
DAYS >= .10        1
DAYS >= .50        0
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.29   05/15 TO 05/15
 STORM TOTAL    0.29

SNOWFALL (INCHES)
TOTALS             T                2.6    -2.6
SINCE 7/1      100.3               71.7    28.6
SNOWDEPTH AVG.     0
DAYS >= 1.0        0

DEGREE DAYS
HEATING TOTAL    416                409       7
 SINCE 7/1      7666               7361     305
COOLING TOTAL      0                  4      -4
 SINCE 1/1         0                  4      -4
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              11.3
RESULTANT WIND SPEED/DIRECTION   2/030
HIGHEST WIND SPEED/DIRECTION    43/240    DATE  05/24
HIGHEST GUST SPEED/DIRECTION    60/280    DATE  05/28

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.37
NUMBER OF DAYS FAIR           17
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     58

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN               17     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       1
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      1
HAZE                      1

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

LOOKING AHEAD TO JUNE 2021...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 74 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 42 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 85
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 49. THE AVERAGE MONTHLY
PRECIPITATION IS 1.34 INCHES AND THE AVERAGE MONTHLY SNOWFALL 0.1
INCHES.

$$



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