Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 011031
CLMRKS

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE SWEETWATER COUNTY
AIRPORT NEAR ROCK SPRINGS 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...

...SEPTEMBER WAS SLIGHTLY COOLER AND SLIGHTLY DRIER THAN NORMAL
IN ROCK SPRINGS...

THE AVERAGE TEMPERATURE FOR ROCK SPRINGS IN SEPTEMBER WAS 55.3
DEGREES...WHICH WAS 1.2 DEGREES BELOW NORMAL. THE WARMEST READING
OF THE MONTH WAS 88 DEGREES ON THE 3RD. THE COLDEST READING WAS 29
DEGREES ON THE 26TH. NO TEMPERATURE RECORDS WERE SET DURING THE
MONTH.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.77 INCHES...WHICH WAS 84
PERCENT OF NORMAL. THE WETTEST 24 HOUR PERIOD WAS THE 22ND...WHEN
0.22 OF AN INCH FELL. NO PRECIPITATION RECORDS WERE SET DURING
THE MONTH. THE HIGHEST WIND GUST WAS 48 MPH ON THE 21ST.

...THE ROCK SPRINGS WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1948 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              89   09/04/1995
                        09/03/1950
 LOW                5   09/18/1965
HIGHEST            88   09/03
LOWEST             29   09/26
AVG. MAXIMUM     67.8              70.3    -2.5
AVG. MINIMUM     42.9              42.7     0.2
MEAN             55.3              56.5    -1.2
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      2
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.67   1965
 MINIMUM            T   2012
TOTALS           0.77              0.92   -0.15
DAILY AVG.       0.03              0.03    0.00
DAYS >= .01         6
DAYS >= .10         4
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.22   09/22 TO 09/22

DEGREE_DAYS
HEATING TOTAL     309               264      45
 SINCE 7/1        326               328      -2
COOLING TOTAL      26                 9      17
 SINCE 1/1        394               286     108
.................................................

WIND (MPH)
AVERAGE WIND SPEED              9.2
RESULTANT WIND SPEED/DIRECTION   2/243
HIGHEST WIND SPEED/DIRECTION    36/060    DATE  09/24
HIGHEST GUST SPEED/DIRECTION    48/190    DATE  09/21

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           20
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY          4

AVERAGE RH (PERCENT)     52

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       6
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      2
HAZE                      6

-  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 63 DEGREES... AND THE AVERAGE LOW
TEMPERATURE IS 37 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH
IS 49 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 28 DEGREES. THE
AVERAGE MONTHLY PRECIPITATION IS 0.87 INCHES.

$$


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