Climatological Report (Monthly)
Issued by NWS

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000
CXUS55 KRIW 010945
CLMP60

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE LAKE YELLOWSTONE 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

...SEPTEMBER WAS MUCH WETTER THAN NORMAL FOR LAKE YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN SEPTEMBER WAS 46.0
DEGREES...WHICH WAS 0.8 DEGREE BELOW NORMAL. THE WARMEST READING OF
THE MONTH WAS 75 DEGREES ON THE 1ST. THE COLDEST READING WAS 25
DEGREES ON THE 10TH AND THE 25TH. A RECORD LOW OF 27 DEGREES WAS
SET ON THE 16TH...TYING THE PREVIOUS RECORD SET IN 2007.

TOTAL PRECIPITATION FOR THE MONTH WAS 2.65 INCHES...WHICH WAS 204
PERCENT OF NORMAL. THIS MAKES IT THE 2ND WETTEST SEPTEMBER ON RECORD.
THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE 12TH...WHEN 0.76 OF
AN INCH OF PRECIPITATION FELL. THIS ALSO SET A NEW
RECORD...BREAKING THE PREVIOUS RECORD OF 0.57 SET IN 1998. 0.68 OF AN
INCH OF PRECIPITATION FELL ON THE 22ND...BREAKING THE PREVIOUS RECORD
OF 0.38...SET IN 2007. 0.37 OF AN INCH OF PRECIPITATION FELL ON THE
23RD...BREAKING THE PREVIOUS RECORD OF 0.12...SET IN 2005. THE
HIGHEST WIND GUST WAS 31 MPH ON THE 2ND.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              79   09/02/2007
                        09/05/1998
 LOW               13   09/24/2000
HIGHEST            75   09/01
LOWEST             25   09/25
                        09/10
AVG. MAXIMUM     59.5
AVG. MINIMUM     32.4
MEAN             46.0              46.8    -0.8
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     20
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.09   2013
 MINIMUM         0.25   2008
TOTALS           2.65              1.30    1.35
DAILY AVG.       0.09
DAYS >= .01        10
DAYS >= .10         5
DAYS >= .50         3
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.76   09/12 TO 09/12

DEGREE_DAYS
HEATING TOTAL     563               548      15
 SINCE 7/1       1146              1135      11
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              3.0
HIGHEST WIND SPEED/DIRECTION    18/260    DATE  09/11
HIGHEST GUST SPEED/DIRECTION    31/290    DATE  09/02

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           30
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     66

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                0     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       0     FOG W/VIS <= 1/4 MILE      0
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 56 DEGREES...AND THE AVERAGE LOW
TEMPERATURE IS 28 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH
IS 38 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 20 DEGREES. THE
AVERAGE MONTHLY PRECIPITATION IS 1.57 INCHES.

$$


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