Climatological Report (Monthly)
Issued by NWS Riverton, WY

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CXUS55 KRIW 011011
CLMRIW

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
216 AM MDT SAT OCT 1 2016

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON REGIONAL AIRPORT
FOR THE MONTH OF SEPTEMBER 2016...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF SEPTEMBER 2016 WILL BE
AVAILABLE APPROXIMATELY IN NOVEMBER 2016 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 59.0
DEGREES...WHICH WAS 0.6 DEGREES ABOVE NORMAL. THE WARMEST READING OF
THE MONTH WAS 90 DEGREES ON THE 1ST. A RECORD HIGH OF 86 DEGREES
OCCURRED ON THE 20TH...BREAKING THE PREVIOUS RECORD OF 84...SET IN
2005. THE COLDEST READING WAS 35 DEGREES ON THE 25TH.

TOTAL PRECIPITATION FOR THE MONTH WAS 1.98 OF AN INCH...WHICH WAS 220
PERCENT OF NORMAL. THIS MAKES IT THE 2ND WETTEST SEPTEMBER ON
RECORD. THE WETTEST 24 HOUR PERIOD WAS THE 22ND AND 23RD...WHEN 0.90
OF AN INCH OF PRECIPITATION FELL. 0.38 OF AN INCH ON THE 22ND SET A
NEW RECORD...BREAKING THE PREVIOUS RECORD OF 0.16...SET IN 2006. 0.58
OF AN INCH OF PRECIPITATION FELL ON THE 23RD...BREAKING THE PREVIOUS
RECORD OF 0.22...SET IN 2005. 0.67 OF AN INCH OF PRECIPITATION ALSO
FELL ON THE 24TH...BREAKING THE PREVIOUS RECORD OF 0.34...SET IN
2007. LASTLY...0.02 OF AN INCH OF PRECIPITATION FELL ON THE
13TH...BREAKING THE PREVIOUS RECORD OF 0.01...SET IN 2004. THE
HIGHEST WIND GUST WAS 42 MPH ON THE 18TH.

...THE RIVERTON WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1995 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              94   09/05/2013
 LOW               21   09/27/1996
HIGHEST            90   09/01
LOWEST             35   09/25
AVG. MAXIMUM     72.6              72.4     0.2
AVG. MINIMUM     45.3              44.3     1.0
MEAN             59.0              58.4     0.6
DAYS MAX >= 90      1
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.01   2013
 MINIMUM         0.01   2010
TOTALS           1.98              0.90    1.08
DAILY AVG.       0.07              0.03    0.04
DAYS >= .01         8
DAYS >= .10         5
DAYS >= .50         2
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.90   09/22 TO 09/23

SNOWFALL (INCHES)
TOTALS            0.0                MM      MM
SINCE 7/1         0.0                MM      MM
SNOWDEPTH AVG.      0
DAYS >= 1.0         0

DEGREE_DAYS
HEATING TOTAL     208               226     -18
 SINCE 7/1        259               264      -5
COOLING TOTAL      35                26       9
 SINCE 1/1        605               494     111
.................................................

WIND (MPH)
AVERAGE WIND SPEED              7.9
RESULTANT WIND SPEED/DIRECTION   2/313
HIGHEST WIND SPEED/DIRECTION    31/260    DATE  09/18
HIGHEST GUST SPEED/DIRECTION    42/240    DATE  09/18

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.20
NUMBER OF DAYS FAIR           22
NUMBER OF DAYS PC              5
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     55

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       4
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       6     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 OCTOBER 2016...THE AVERAGE HIGH TEMPERATURE ON
THE FIRST OF THE MONTH IS 82 DEGREES...AND THE AVERAGE LOW
TEMPERATURE IS 42 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH
IS 72 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 28 DEGREES. THE
AVERAGE MONTHLY PRECIPITATION IS 0.86 INCHES.

$$



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