Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 011012 AAA
CLMGEY

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE SOUTH BIG HORN COUNTY
AIRPORT NEAR GREYBULL 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 MUCH WETTER THAN NORMAL IN GREYBULL...

THE AVERAGE TEMPERATURE FOR GREYBULL IN SEPTEMBER WAS 59.2
DEGREES...WHICH WAS 0.0 DEGREES ABOVE NORMAL. THE WARMEST READING
OF THE MONTH WAS 95 DEGREES ON THE 3RD. A NEW RECORD HIGH OF 91
DEGREES WAS SET ON THE 11TH...BREAKING THE PREVIOUS RECORD OF
89...SET IN 2004. A NEW RECORD HIGH OF 93 DEGREES WAS SET ON THE
12TH...BREAKING THE PREVIOUS RECORD OF 91...SET IN 2015. THE
COLDEST READING WAS 37 DEGREES ON THE 17TH...20TH...AND 27TH.

TOTAL PRECIPITATION FOR THE MONTH WAS 2.00...WHICH WAS 227 PERCENT
OF NORMAL. THIS MAKES IT THE 2ND WETTEST SEPTEMBER ON RECORD. THE
WETTEST 24 HOUR PERIOD WAS THE 15TH...WHEN 0.74 INCHES FELL. THIS
BROKE THE PREVIOUS RECORD OF 0.41...SET IN 2006. SEVERAL OTHER
RECORDS WERE SET DURING THE MONTH:
NEW RECORD (DATE)                          OLD RECORD (YEAR)
0.60 INCHES ON THE 14TH...                 0.57 INCHES (2011)
0.09 INCHES ON THE 18TH...                 0.07 INCHES (2013)
0.13 INCHES ON THE 25TH...                 0.04 INCHES (2015)

THE HIGHEST WIND GUST WAS 41 MPH ON THE 13TH.

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

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              98   09/04/2007
                        09/03/2007
 LOW               27   09/18/2003
                        09/29/1999
HIGHEST            95   09/03
LOWEST             37   09/27
                        09/20
                        09/17
AVG. MAXIMUM     73.0              75.2    -2.2
AVG. MINIMUM     45.3              43.2     2.1
MEAN             59.2              59.2     0.0
DAYS MAX >= 90      5
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.76   2016
 MINIMUM         0.01   2015
TOTALS           2.00              0.88    1.12
DAILY AVG.       0.07              0.03    0.04
DAYS >= .01        10
DAYS >= .10         5
DAYS >= .50         2
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.74   09/15 TO 09/15

DEGREE_DAYS
HEATING TOTAL     231               210      21
 SINCE 7/1        231               231       0
COOLING TOTAL      62                36      26
 SINCE 1/1        824               669     155
.................................................

WIND (MPH)
AVERAGE WIND SPEED              6.1
HIGHEST WIND SPEED/DIRECTION    33/310    DATE  09/04
HIGHEST GUST SPEED/DIRECTION    41/350    DATE  09/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           18
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     58

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       3
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      1
HAZE                      8

-  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 37 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH
IS 53 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 27 DEGREES. THE
AVERAGE MONTHLY PRECIPITATION IS 0.60 INCHES.

$$



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