Climatological Report (Monthly)
Issued by NWS Riverton, WY

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CXUS55 KRIW 012326
CLMRIW

CYSCLMRIW 000
TTAA00 KRIW 011919


CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
118 PM MDT WED OCT 1 2014

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON REGIONAL AIRPORT
FOR THE MONTH OF SEPTEMBER 2014...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF SEPTEMBER 2014 WILL BE
AVAILABLE APPROXIMATELY IN NOVEMBER 2014 FROM THE NATIONAL CLIMATIC
DATA CENTER (HTTP://WWW.NCDC.NOAA.GOV/OL/CLIMATEDATA.HTML).
UNOFFICIAL ASOS DAILY SUMMARIES ARE AVAILABLE ON THE INTERNET AT
HTTP://WWW.CRH.NOAA.GOV/RIW/CLIMATE/...

...SEPTEMBER WAS WARMER AND SLIGHTLY DRIER THAN NORMAL IN
RIVERTON....

THE AVERAGE TEMPERATURE FOR RIVERTON IN SEPTEMBER WAS 60.1
DEGREES...WHICH WAS 1.7 DEGREES ABOVE NORMAL. THIS MAKES IT THE 9TH
WARMEST SEPTEMBER ON RECORD FOR THE RIVERTON AIRPORT SITE. THE
WARMEST READING FOR THE MONTH WAS 90 DEGREES ON THE 18TH...WHICH SET
A NEW DAILY RECORD FOR THE 18TH...BREAKING THE OLD RECORD OF 85
DEGREES...WHICH WAS LAST SET IN 2004. 2 OTHER RECORD HIGH
TEMPERATURES WERE SET DURING THE MONTH. ON THE 24TH A RECORD HIGH
TEMPERATURE OF 84 DEGREES BROKE THE PREVIOUS RECORD OF 83
DEGREES...WHICH WAS LAST SET IN 2001. AND ON THE 25TH A RECORD HIGH
TEMPERATURE OF 88 DEGREES BROKE THE PREVIOUS RECORD OF 85
DEGREES...WHICH WAS LAST SET IN 2011. THE COLDEST READING FOR THE
MONTH WAS 28 DEGREES ON THE 12TH...WHICH BROKE THE DAILY RECORD LOW
TEMPERATURE FOR THE 12TH...BREAKING THE PREVIOUS LOW OF 38
DEGREES...WHICH LAST OCCURRED IN 2003. 3 OTHER RECORD LOW
TEMPERATURES WERE SET DURING THE MONTH. ON THE 11TH A RECORD LOW
TEMPERATURE OF 32 DEGREES BROKE THE PREVIOUS RECORD LOW OF 39
DEGREES...WHICH WAS LAST SET IN 2010. ON THE 13TH A RECORD LOW
TEMPERATURE OF 31 DEGREES BROKE THE PREVIOUS RECORD LOW OF 32
DEGREES...WHICH WAS LAST SET IN 1999. AND ON THE 15TH A RECORD LOW
TEMPERATURE OF 37 DEGREES TIED THE PREVIOUS RECORD LOW...WHICH WAS
LAST SET IN 2004. IN ADDITION THERE WERE 2 RECORD LOW HIGH
TEMPERATURES SET THIS MONTH. ON THE 11TH RECORD LOW HIGH TEMPERATURE
OF 46 DEGREES BROKE THE PREVIOUS RECORD LOW HIGH OF 55
DEGREES...WHICH WAS LAST SET IN 2008. AND ON THE 12TH A RECORD LOW
HIGH TEMPERATURE OF 58 DEGREES BROKE THE PREVIOUS RECORD LOW HIGH OF
59 DEGREES...WHICH WAS LAST SET IN 2013.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.81 OF AN INCH...WHICH WAS 90
PERCENT OF NORMAL. THIS MAKES IT THE 3RD WETTEST SEPTEMBER ON
RECORD. THE WETTEST 24 HOUR PERIOD OCCURRED ON THE 27TH AND
28TH...WHEN 0.59 OF AN INCH OF PRECIPITATION FELL. 0.07 OF AN INCH
OF PRECIPITATION FELL ON THE 11TH...BREAKING THE PREVIOUS RECORD OF
A TRACE SET IN 2011. 0.56 OF AN INCH OF PRECIPITATION FELL ON THE
28TH...BREAKING THE PREVIOUS RECORD OF A TRACE SET IN 2012. 0.3
INCHES OF SNOW ALSO FELL DURING THE MONTH OF SEPTEMBER...ALL OF IT
ON THE 11TH...SETTING A NEW DAILY RECORD OF SNOWFALL FOR SEPTEMBER
11TH AT THE RIVERTON AIRPORT SITE. THE HIGHEST WIND GUST WAS 51
MPH...WHICH OCCURRED ON THE 7TH.



...THE RIVERTON WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1995 TO 2014

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   09/18
LOWEST             28   09/12
AVG. MAXIMUM     74.7              72.4     2.3
AVG. MINIMUM     45.4              44.3     1.1
MEAN             60.1              58.4     1.7
DAYS MAX >= 90      1
DAYS MAX <= 32      0
DAYS MIN <= 32      3
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.01   2013
 MINIMUM         0.01   2010
TOTALS           0.81              0.90   -0.09
DAILY AVG.       0.03              0.03    0.00
DAYS >= .01        10
DAYS >= .10         1
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.59   09/27 TO 09/28
 STORM TOTAL       MM
 (MM/DD(HH))

SNOWFALL (INCHES)
TOTALS            0.3                MM      MM
SINCE 7/1         0.3                MM      MM
SNOWDEPTH AVG.      0
DAYS >= 1.0         0

DEGREE_DAYS
HEATING TOTAL     172               226     -54
 SINCE 7/1        222               264     -42
COOLING TOTAL      31                26       5
 SINCE 1/1        431               494     -63
.................................................

WIND (MPH)
AVERAGE WIND SPEED              9.0
RESULTANT WIND SPEED/DIRECTION   3/337
HIGHEST WIND SPEED/DIRECTION    38/250    DATE  09/03
HIGHEST GUST SPEED/DIRECTION    51/300    DATE  09/07

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.20
NUMBER OF DAYS FAIR           25
NUMBER OF DAYS PC              3
NUMBER OF DAYS CLOUDY          2

AVERAGE RH (PERCENT)     49

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       2
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                1     SLEET                      0
FOG                       3     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 OCTOBER 2014...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. THE AVERAGE MONTHLY SNOW IS
3.9 INCHES.

$$






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