Climatological Report (Monthly)
Issued by NWS

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000
CXUS55 KRIW 010931
CLMCPR

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
254 AM MDT SUN OCT 1 2017

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE NATRONA COUNTY
INTERNATIONAL AIRPORT NEAR CASPER FOR THE MONTH OF SEPTEMBER 2017...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF SEPTEMBER 2017 WILL BE
AVAILABLE APPROXIMATELY IN NOVEMBER 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

...CASPER WAS WETTER THAN NORMAL IN SEPTEMBER...

THE AVERAGE TEMPERATURE FOR CASPER IN SEPTEMBER WAS 57.2
DEGREES...WHICH WAS 0.7 DEGREES BELOW NORMAL. THE WARMEST READING
OF THE MONTH WAS 95 DEGREES ON THE 3RD...BREAKING THE PREVIOUS
RECORD OF 93...SET IN 1998. A NEW RECORD HIGH OF 91 DEGREES WAS SET
ON THE 9TH...TYING THE PREVIOUS RECORD ALSO SET IN 1998. THE COLDEST
READING OF THE MONTH WAS 30 DEGREES ON THE 27TH.

TOTAL PRECIPITATION FOR THE MONTH WAS 1.42 INCHES...WHICH WAS 131
PERCENT OF NORMAL. THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS ON
THE 15TH...WHEN 0.47 INCHES OF PRECIPITATION FELL. THIS BROKE THE
PREVIOUS RECORD OF 0.27...SET IN 1965. THE HIGHEST WIND GUST WAS 47
MPH ON THE 20TH.

...THE CASPER WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1939 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              97   09/01/1995
 LOW               15   09/28/1945
HIGHEST            95   09/03
LOWEST             30   09/27
AVG. MAXIMUM     72.7              74.3    -1.6
AVG. MINIMUM     41.7              41.4     0.3
MEAN             57.2              57.9    -0.7
DAYS MAX >= 90      4
DAYS MAX <= 32      0
DAYS MIN <= 32      2
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.40   1982
 MINIMUM         0.07   1956
TOTALS           1.42              1.08    0.34
DAILY AVG.       0.05              0.04    0.01
DAYS >= .01         9
DAYS >= .10         4
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.47   09/15 TO 09/15

SNOWFALL (INCHES)
TOTALS              T               1.8    -1.8
SINCE 7/1           T               1.8    -1.8
DAYS >= 1.0         0

DEGREE_DAYS
HEATING TOTAL     278               239      39
 SINCE 7/1        299               285      14
COOLING TOTAL      54                25      29
 SINCE 1/1        448               422      26
.................................................

WIND (MPH)
AVERAGE WIND SPEED              9.3
RESULTANT WIND SPEED/DIRECTION   3/258
HIGHEST WIND SPEED/DIRECTION    37/230    DATE  09/20
HIGHEST GUST SPEED/DIRECTION    47/230    DATE  09/20

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           20
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     54

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       2
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                      12     FOG W/VIS <= 1/4 MILE      2
HAZE                      7

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

LOOKING AHEAD TO OCTOBER 2017...THE AVERAGE HIGH TEMPERATURE ON
THE FIRST OF THE MONTH IS 66 DEGREES...AND THE AVERAGE LOW
TEMPERATURE IS 35 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH
IS 53 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 27. THE AVERAGE
MONTHLY PRECIPITATION IS 1.11 INCHES.

$$


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