Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 020909 AAA
CLMP60

CLIMATE REPORT...AMENDED
NATIONAL WEATHER SERVICE RIVERTON WY
352 PM MDT THU JUN 1 2017

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

...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 2017 WILL BE
AVAILABLE APPROXIMATELY IN JULY 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 MUCH DRIER IN MAY...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN MAY WAS 39.4
DEGREES...WHICH WAS 0.6 DEGREES BELOW NORMAL. THE WARMEST READING OF
THE MONTH WAS 70 DEGREES ON THE 31ST. A RECORD HIGH OF 63 DEGREES
WAS SET ON THE 6TH...TYING THE PREVIOUS RECORD SET IN 2004. THE
COLDEST READING WAS 18 DEGREES ON THE 3RD.  A RECORD LOW OF 27
DEGREES OCCURRED ON THE 28TH...TYING THE PREVIOUS RECORD...SET IN
2005.

TOTAL PRECIPITATION FOR THE MONTH WAS 1.09 INCHES...WHICH WAS 48
PERCENT OF NORMAL. THIS MAKES IT THE 3RD DRIEST MAY ON RECORD. THE
WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE 17TH...WHEN 0.50 INCHES
FELL...AND SETTING A NEW RECORD. THIS BROKE THE PREVIOUS RECORD OF
0.16...SET IN 2013. THE HIGHEST WIND GUST WAS 36 MPH ON THE 24TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF MAY
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              78   05/28/2003
 LOW                0   05/07/2010
HIGHEST            70   05/31
LOWEST             18   05/03
AVG. MAXIMUM     52.8
AVG. MINIMUM     26.0
MEAN             39.4              40.0    -0.6
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     31
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.41   2004
 MINIMUM         0.72   2001
TOTALS           1.09              2.27   -1.18
DAILY AVG.       0.04
DAYS >= .01        10
DAYS >= .10         3
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.50   05/17 TO 05/17

DEGREE_DAYS
HEATING TOTAL     785               777       8
 SINCE 7/1      10999             11028     -29
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.3
HIGHEST WIND SPEED/DIRECTION    17/250    DATE  05/24
HIGHEST GUST SPEED/DIRECTION    36/230    DATE  05/24

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)     68

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                2     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 JUNE 2017...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 57 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 32 DEGREES. THE AVERAGE HIGH TEMPERATURE BY THE END OF THE MONTH
IS 68 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 38. THE AVERAGE
MONTHLY PRECIPITATION IS 2.00 INCHES.

$$



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