Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 010855
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
201 AM MDT MON JUN 1 2015

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF MAY 2015...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 2015 WILL BE
AVAILABLE APPROXIMATELY IN JULY 2015 FROM THE NATIONAL CLIMATIC
DATA CENTER (WWW.NCDC.NOAA.GOV). UNOFFICIAL ASOS DAILY SUMMARIES ARE
ONLINE AT WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW..

...MAY WAS WARMER AND WETTER THAN AVERAGE AT LAKE YELLOWSTONE...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN MAY WAS 41.1
DEGREES...WHICH WAS 1.1 DEGREES ABOVE NORMAL. THIS WOULD MAKE IT THE
2ND WARMEST MAY SINCE RECORDS BEGAN IN 1998. THE WARMEST MAY WAS IN
2007...WITH AN AVERAGE TEMPERATURE OF 41.6 DEGREES. THE WARMEST
READING FOR THE MONTH WAS 65 DEGREES ON THE 31ST. NEW DAILY RECORD
HIGH TEMPERATURES FOR THE MONTH INCLUDE 61 DEGREES ON THE 2ND...AND
59 DEGREES ON THE 3RD. THE COLDEST READING WAS 18 DEGREES ON THE
11TH. THERE WERE NO RECORD LOW TEMPERATURES DURING THE MONTH. DAILY
RECORDS FOR THIS SITE ONLY DATE BACK TO 1998.

TOTAL PRECIPITATION FOR THE MONTH WAS 3.11 INCHES...WHICH WAS 137
PERCENT OF NORMAL. THIS MAKES IT THE 3RD WETTEST MAY SINCE RECORDS
BEGAN IN 1998. THE WETTEST OCCURRED IN 2004...WHEN 3.41 INCHES OF
PRECIPITATION FELL. THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS ON
THE 15TH WHEN 0.64 INCHES OF PRECIPITATION FELL. NEW DAILY RECORD
PRECIPITATION FOR THE MONTH INCLUDE...0.39 INCHES ON THE 12TH...0.10
INCHES ON THE 13TH...0.64 INCHES ON THE 15TH...AND 0.54 INCHES ON
THE 28TH. THE HIGHEST WIND GUST WAS 32 MPH ON THE 2ND.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF MAY 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              78   05/28/2003
 LOW                0   05/07/2010
HIGHEST            65   05/31
LOWEST             18   05/11
AVG. MAXIMUM     52.1
AVG. MINIMUM     29.8
MEAN             41.1              40.0     1.1
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     25
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.41   2004
 MINIMUM         0.72   2001
TOTALS           3.11              2.27    0.84
DAILY AVG.       0.10
DAYS >= .01        19
DAYS >= .10        11
DAYS >= .50         2
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.64   05/15 TO 05/15

DEGREE_DAYS
HEATING TOTAL     710               777     -67
 SINCE 7/1      10436             11028    -592
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0
.................................................

WIND (MPH)
AVERAGE WIND SPEED              2.3
HIGHEST WIND SPEED/DIRECTION    20/290    DATE  05/02
HIGHEST GUST SPEED/DIRECTION    32/300    DATE  05/02

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)     69

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 JUNE 2015...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 55 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 32 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 71
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 39 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 2.00 INCHES.

$$






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