Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 020906 AAA
CLMGEY

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE SOUTH BIG HORN COUNTY
AIRPORT NEAR GREYBULL 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

...MAY WAS SLIGHTLY WARMER AND MUCH DRIER THAN NORMAL IN GREYBULL...

THE AVERAGE TEMPERATURE FOR GREYBULL IN APRIL WAS 57.6 DEGREES...
WHICH WAS 1.0 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH
WAS 89 DEGREES ON THE 6TH...SETTING A NEW RECORD HIGH. THIS BROKE
THE PREVIOUS RECORD OF 81...SET IN 2004. A RECORD HIGH OF 88 DEGREES
WAS SET ON THE 24TH...BREAKING THE PREVIOUS RECORD OF 86 DEGREES...
SET IN 2001. THE COLDEST READING WAS 34 DEGREES ON THE 20TH. A
RECORD LOW OF 36 DEGREES WAS SET ON THE 27TH...BREAKING THE PREVIOUS
RECORD OF 39 DEGREES...SET IN 2012.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.52...WHICH WAS 32 PERCENT OF
NORMAL.  THIS MAKES IT THE 4TH DRIEST MAY ON RECORD. THE WETTEST 24
HOUR PERIOD WAS THE 17TH...WHEN 0.17 INCHES FELL. NO PRECIPITATION
RECORDS WERE SET DURING THE MONTH. THE HIGHEST WIND GUST WAS 61 MPH
ON THE 17TH.

...THE GREYBULL 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              98   05/29/2003
 LOW               20   05/09/2002
HIGHEST            89   05/06
LOWEST             34   05/20
AVG. MAXIMUM     71.9              70.4     1.5
AVG. MINIMUM     43.2              42.7     0.5
MEAN             57.6              56.6     1.0
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.32   2010
 MINIMUM         0.19   2001
TOTALS           0.52              1.65   -1.13
DAILY AVG.       0.02              0.05   -0.03
DAYS >= .01         8
DAYS >= .10         3
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.17   05/17 TO 05/17

DEGREE_DAYS
HEATING TOTAL     233               281     -48
 SINCE 7/1       7435              7680    -245
COOLING TOTAL      12                19      -7
 SINCE 1/1         12                20      -8
.................................................

WIND (MPH)
AVERAGE WIND SPEED              8.6
HIGHEST WIND SPEED/DIRECTION    41/290    DATE  05/07
HIGHEST GUST SPEED/DIRECTION    53/270    DATE  05/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           19
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     49

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       2
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       2     FOG W/VIS <= 1/4 MILE      0
HAZE                      1

-  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 76 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 48 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 87
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 55 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 1.20 INCHES.

$$



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