Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 012033
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1433 PM MDT SUN JUL 1 2018

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE LAKE YELLOWSTONE FOR
THE MONTH OF JUNE 2018...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF JUNE 2018 WILL BE
AVAILABLE APPROXIMATELY IN 60 DAYS FROM THE NATIONAL CENTERS FOR
ENVIRONMENTAL INFORMATION (HTTP://WWW.NCDC.NOAA.GOV/CDO-
WEB/DATASETS). UNOFFICIAL ASOS DAILY SUMMARIES ARE AVAILABLE ON THE
INTERNET AT HTTP://WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW

...JUNE WAS COOLER AND MUCH WETTER THAN NORMAL FOR LAKE
YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN JUNE WAS 47.4
DEGREES...WHICH WAS 1.2 DEGREES BELOW NORMAL. THE WARMEST READING OF
THE MONTH WAS 75 DEGREES ON THE 9TH AND 28TH...AND THE COLDEST
READING WAS 24 DEGREES ON THE 12TH. A FEW TEMPERATURE RECORDS WERE
SET THIS MONTH...26 DEGREES ON THE 2ND BROKE A RECORD LOW OF 28 FROM
2004...75 DEGREES ON THE 9TH BROKE A RECORD HIGH OF 73 FROM
2016...AND 24 DEGREES ON THE 12TH BROKE A RECORD LOW OF 27 FROM 2012.

TOTAL PRECIPITATION FOR THE MONTH WAS 4.02 INCHES...WHICH WAS 201
PERCENT OF NORMAL.  THIS MADE IT THE 4TH WETTEST JUNE ON RECORD
SINCE 1998. THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE 17TH
WHEN 0.79 INCHES FELL. THIS BREAKS THE PREVIOUS DAILY RECORD OF 0.27
SET IN 2003. A FEW OTHER RECORDS WERE BROKEN...0.57 INCHES ON THE
18TH BROKE A RECORD OF 0.38 FROM 2009...0.15 INCHES ON THE 19TH
BROKE A RECORD OF 0.05 FROM 2011...AND 0.48 INCHES ON THE 23RD BROKE
A RECORD OF 0.12 FROM 2005. THE HIGHEST WIND GUST WAS 37 MPH ON THE
21ST.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF JUNE
2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              83   06/29/2015
 LOW               21   06/04/2011
HIGHEST            75   06/28
                        06/09
LOWEST             24   06/12
AVG. MAXIMUM     61.8
AVG. MINIMUM     33.0
MEAN             47.4              48.6    -1.2
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     11
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.34   2010
 MINIMUM         0.35   2007
TOTALS           4.02              2.00    2.02
DAILY AVG.       0.13
DAYS >= .01        11
DAYS >= .10         9
DAYS >= .50         4
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.79   06/17 TO 06/17

DEGREE_DAYS
HEATING TOTAL     519               493      26
 SINCE 7/1      11660             11521     139
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              3.1
HIGHEST WIND SPEED/DIRECTION    23/280    DATE  06/21
HIGHEST GUST SPEED/DIRECTION    37/310    DATE  06/21

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)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              M     MIXED PRECIP               M
HEAVY RAIN                9     RAIN                      11
LIGHT RAIN               11     FREEZING RAIN              M
LT FREEZING RAIN          M     HAIL                       M
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      M
FOG                       M     FOG W/VIS <= 1/4 MILE      M
HAZE                      M

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

LOOKING AHEAD TO JULY 2018...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 69 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 38. THE AVERAGE HIGH TEMPERATURE BY THE END OF THE MONTH IS 74
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 41. THE AVERAGE MONTHLY
PRECIPITATION IS 1.47 INCHES.

$$



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