Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 012034 AAA
CLMP60

CLIMATE REPORT...AMENDED
NATIONAL WEATHER SERVICE RIVERTON WY
1137 AM MDT FRI SEP 1 2017

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE LAKE YELLOWSTONE FOR
THE MONTH OF AUGUST 2017...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF AUGUST 2017 WILL BE
AVAILABLE APPROXIMATELY IN OCTOBER 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

...LAKE YELLOWSTONE WAS SLIGHTLY COOLER AND SLIGHTLY DRIER IN
AUGUST...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN AUGUST WAS 54.2
DEGREES...WHICH WAS 1.0 DEGREES BELOW NORMAL. THIS MAKES IT THE 11TH
COLDEST AUGUST ON RECORD. THE WARMEST READING OF THE MONTH WAS 79
DEGREES ON THE 1ST AND 27TH...SETTING A NEW RECORD ON THE 27TH. THIS
TIED THE PREVIOUS RECORD SET IN 2012. A RECORD HIGH OF 78 DEGREES
WAS SET ON THE 4TH...BREAKING THE PREVIOUS RECORD OF 77...SET IN
2013. THE COLDEST READING WAS 33 DEGREES ON THE 7TH...10TH AND 16TH.
A NEW RECORD LOW OCCURRED ON THE 7TH...BREAKING THE PREVIOUS RECORD
OF 35...SET IN 2013.

TOTAL PRECIPITATION FOR THE MONTH WAS 1.31 INCHES...WHICH WAS 86
PERCENT OF NORMAL. THIS MAKES IT THE 7TH WETTEST AUGUST ON RECORD.
THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE 9TH...WHEN 0.52
INCHES FELL...AND SETTING A NEW RECORD. THIS BROKE THE PREVIOUS
RECORD OF 0.24...SET IN 2010. 0.14 OF AN INCH OF PRECIPITATION FELL
ON THE 24TH...BREAKING THE PREVIOUS RECORD OF 0.12...SET IN 2004.
0.29 OF AN INCH OF PRECIPITATION FELL ON THE 31ST...BREAKING THE
PREVIOUS RECORD OF 0.26...WHICH WAS SET IN 2014. THE HIGHEST WIND
GUST WAS 30 MPH ON THE 29TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF AUGUST 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              84   08/14/2003
                        08/12/2003
                        08/06/2001
 LOW               25   08/31/2005
HIGHEST            79   08/27
                        08/01
LOWEST             33   08/16
                        08/10
                        08/07
AVG. MAXIMUM     70.7
AVG. MINIMUM     37.7
MEAN             54.2              55.2    -1.0
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.29   2014
 MINIMUM         0.13   2012
TOTALS           1.31              1.52   -0.21
DAILY AVG.       0.04
DAYS >= .01         9
DAYS >= .10         4
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.52   08/09 TO 08/09

DEGREE_DAYS
HEATING TOTAL     327               304      23
 SINCE 7/1        553               587     -34
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.4
HIGHEST WIND SPEED/DIRECTION    18/280    DATE  08/30
HIGHEST GUST SPEED/DIRECTION    30/270    DATE  08/29

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           31
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     63

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                1     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 AUGUST 2017...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 68 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 35 DEGREES. THE AVERAGE HIGH TEMPERATURE BY THE END OF THE MONTH
IS 55 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 28. THE AVERAGE
MONTHLY PRECIPITATION IS 1.30 INCHES.

$$



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