Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 012200
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CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
118 PM MDT WED OCT 1 2014

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE 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 HAD AVERAGE TEMPERATURES WITH MUCH WETTER THAN AVERAGE
CONDITIONS FOR LAKE YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN SEPTEMBER WAS 46.8
DEGREES...WHICH WAS NORMAL. THE WARMEST DAILY HIGH FOR THE MONTH WAS
A DAILY RECORD 73 DEGREES ON THE 25TH...WHICH BROKE THE PREVIOUS
DAILY RECORD FOR THE 25TH OF 72 DEGREES...WHICH WAS LAST SET IN 2009.
THE COLDEST READING FOR THE MONTH WAS A RECORD 18 DEGREES ON THE
12TH...WHICH BROKE THE PREVIOUS DAILY LOW TEMPERATURE RECORD FOR THE
12TH OF 25 DEGREES...WHICH WAS LAST SET IN 2012. THERE WERE 3 OTHER
LOW TEMPERATURE RECORDS DURING SEPTEMBER. ON THE 4TH A RECORD LOW
TEMPERATURE OF 27 DEGREES TIED THE RECORD LOW TEMPERATURE LAST SET
IN 2011. ON THE 11TH A RECORD LOW TEMPERATURE OF 22 DEGREES BROKE
THE PREVIOUS RECORD LOW TEMPERATURE OF 26 DEGREES...WHICH WAS LAST
SET IN 2010. AND ON THE 13TH A RECORD LOW TEMPERATURE OF 24 DEGREES
TIED THE RECORD LOW TEMPERATURE...WHICH WAS LAST SET IN 2012.

TOTAL PRECIPITATION FOR THE MONTH WAS 2.17 INCHES...WHICH WAS 167
PERCENT OF NORMAL. THIS MAKES IT THE 4TH WETTEST SEPTEMBER ON
RECORD. THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS ON THE
18TH...WHEN 0.47 INCHES OF PRECIPITATION FELL. 3 NEW RECORDS WERE
SET DURING THE MONTH. 0.28 OF AN INCH OF PRECIPITATION FELL ON THE
9TH...BREAKING THE PREVIOUS RECORD OF 0.19 INCHES SET IN 2013. 0.24
OF AN INCH OF PRECIPITATION FELL ON THE 10TH...BREAKING THE PREVIOUS
RECORD OF 0.22 INCHES SET IN 2003.  0.39 OF AN INCH OF PRECIPITATION
FELL ON THE 27TH...BREAKING THE PREVIOUS RECORD OF 0.27 INCHES SET
IN 2004. THE HIGHEST WIND GUST WAS 30 MPH...WHICH OCCURRED ON THE
9TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2014

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            73   09/25
LOWEST             18   09/12
AVG. MAXIMUM     61.1
AVG. MINIMUM     32.5
MEAN             46.8              46.8     0.0
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     15
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.09   2013
 MINIMUM         0.25   2008
TOTALS           2.17              1.30    0.87
DAILY AVG.       0.07
DAYS >= .01        12
DAYS >= .10         6
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.47   09/18 TO 09/18
                        09/17 TO 09/18
                        09/18 TO 09/18

DEGREE_DAYS
HEATING TOTAL     538               548     -10
 SINCE 7/1       1200              1135      65
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.6
HIGHEST WIND SPEED/DIRECTION    18/270    DATE  09/08
HIGHEST GUST SPEED/DIRECTION    30/320    DATE  09/09

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)     67

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 2014...THE AVERAGE HIGH TEMPERATURE ON
THE FIRST OF THE MONTH IS 55 DEGREES...AND THE AVERAGE LOW
TEMPERATURE IS 27 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH
IS 41 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 18. THE AVERAGE
MONTHLY PRECIPITATION IS 1.35 INCHES.

$$






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