Climatological Report (Monthly)
Issued by NWS

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000
CXUS55 KRIW 011152
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
251 AM MDT THU SEP 1 2016

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE LAKE YELLOWSTONE FOR
THE MONTH OF AUGUST 2016...

NOTE...THERE WERE 5 DAYS OF MISSING DATA DURING AUGUST.

...OFFICIAL CLIMATE DATA FOR THE MONTH OF AUGUST 2016 WILL BE
AVAILABLE APPROXIMATELY IN OCTOBER 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

...AUGUST WAS SLIGHTLY COOLER AND THE 2ND DRIEST ON RECORD FOR LAKE
YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN AUGUST WAS 54.0
DEGREES...WHICH WAS 1.2 DEGREE BELOW NORMAL. THE WARMEST READING OF
THE MONTH WAS 82 DEGREES ON THE 2ND...SETTING A NEW RECORD. THIS
BROKE THE PREVIOUS RECORD OF 81...SET IN 2001. A RECORD HIGH OF 78
DEGREES OCCURRED ON THE 30TH...TYING THE PREVIOUS RECORD LAST SET IN
2008. A RECORD HIGH OF 79 DEGREES WAS SET ON THE 31ST...BREAKING THE
PREVIOUS RECORD OF 76...SET IN 2013. THE COLDEST READING WAS 27
DEGREES ON THE 20TH...SETTING A NEW RECORD. THIS BROKE THE PREVIOUS
RECORD OF 32...SET IN 2006. A RECORD LOW OF 34 DEGREES WAS SET ON
THE 5TH...TYING THE PREVIOUS RECORD SET IN 2012.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.31 INCHES...WHICH WAS 20
PERCENT OF NORMAL. THIS MAKES IT THE 2ND DRIEST AUGUST ON RECORD.
THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE 18TH...WHEN 0.12 OF
AN INCH OF PRECIPITATION FELL. 0.04 OF AN INCH OF PRECIPITATION FELL
ON THE 7TH...BREAKING THE PREVIOUS RECORD OF 0.02...SET IN 2011. THE
HIGHEST WIND GUST WAS 34 MPH ON THE 15TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF AUGUST 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              84   08/14/2003
                        08/12/2003
                        08/06/2001
 LOW               25   08/31/2005
HIGHEST            82   08/02
LOWEST             27   08/20
AVG. MAXIMUM     72.4
AVG. MINIMUM     35.6
MEAN             54.0              55.2    -1.2
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      7
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.29   2014
 MINIMUM         0.13   2012
TOTALS           0.31              1.52   -1.21
DAILY AVG.       0.01
DAYS >= .01         5
DAYS >= .10         2
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.12   08/18 TO 08/18

DEGREE_DAYS
HEATING TOTAL     275               304     -29
 SINCE 7/1        583               587      -4
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.9
HIGHEST WIND SPEED/DIRECTION    21/320    DATE  08/15
HIGHEST GUST SPEED/DIRECTION    34/300    DATE  08/15

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           27
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     53

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 SEPTEMBER 2016...THE AVERAGE HIGH TEMPERATURE ON
THE FIRST OF THE MONTH IS 65 DEGREES...AND THE AVERAGE LOW
TEMPERATURE IS 35 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH
IS 59 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 29 DEGREES. THE
AVERAGE MONTHLY PRECIPITATION IS 1.37 INCHES.

$$



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