Climatological Report (Monthly)
Issued by NWS Riverton, WY

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CXUS55 KRIW 011024
CLMRIW

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

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

...RIVERTON WAS MUCH WETTER THAN NORMAL IN SEPTEMBER...

THE AVERAGE TEMPERATURE FOR RIVERTON IN SEPTEMBER WAS 57.5
DEGREES...WHICH WAS 0.9 DEGREES BELOW NORMAL. THE WARMEST READING
OF THE MONTH WAS 92 DEGREES ON THE 3RD. THIS SET A NEW
RECORD...TYING THE PREVIOUS RECORD SET IN 2007. A NEW RECORD HIGH OF
87 DEGREES WAS SET ON THE 11TH...TYING THE PREVIOUS RECORD SET IN
2004. A NEW RECORD HIGH OF 88 DEGREES WAS SET ON THE 12TH...BREAKING
THE PREVIOUS RECORD OF 87...SET IN 2004. THE COLDEST READING WAS 34
DEGREES ON THE 26TH.

TOTAL PRECIPITATION FOR THE MONTH WAS 1.73 INCHES...WHICH WAS 192
PERCENT OF NORMAL. THIS MAKES IT THE 3RD WETTEST SEPTEMBER ON
RECORD. THE WETTEST 24 HOUR PERIOD WAS ON THE 15TH...WHEN 0.68 OF AN
INCH FELL AND SET A NEW RECORD. THIS BROKE THE PREVIOUS RECORD OF
0.54...SET IN 2013. 0.43 OF AN INCH OF PRECIPITATION FELL ON THE
22ND...BREAKING THE PREVIOUS RECORD OF 0.38...SET IN 2016. THE
HIGHEST WIND GUST WAS 46 MPH ON THE 14TH.

...THE RIVERTON WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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              94   09/05/2013
 LOW               21   09/27/1996
HIGHEST            92   09/03
LOWEST             34   09/26
AVG. MAXIMUM     69.4              72.4    -3.0
AVG. MINIMUM     45.6              44.3     1.3
MEAN             57.5              58.4    -0.9
DAYS MAX >= 90      2
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.01   2013
 MINIMUM         0.01   2010
TOTALS           1.73              0.90    0.83
DAILY AVG.       0.06              0.03    0.03
DAYS >= .01         8
DAYS >= .10         5
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.68   09/15 TO 09/15

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

DEGREE_DAYS
HEATING TOTAL     284               226      58
 SINCE 7/1        291               264      27
COOLING TOTAL      67                26      41
 SINCE 1/1        547               494      53
.................................................

WIND (MPH)
AVERAGE WIND SPEED              8.0
RESULTANT WIND SPEED/DIRECTION   3/331
HIGHEST WIND SPEED/DIRECTION    33/250    DATE  09/19
HIGHEST GUST SPEED/DIRECTION    46/290    DATE  09/14

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           20
NUMBER OF DAYS PC              5
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     55

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       3
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                1     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      1
HAZE                      2

-  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 65 DEGREES...AND THE AVERAGE LOW
TEMPERATURE IS 38 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH
IS 50 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 27. THE AVERAGE
MONTHLY PRECIPITATION IS 0.89 INCHES.

$$



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