Climatological Report (Monthly)
Issued by NWS

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281
CXUS55 KRIW 011138
CLMGEY

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
335 AM MDT MON MAY 1 2017

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE SOUTH BIG HORN COUNTY
AIRPORT NEAR GREYBULL FOR THE MONTH OF APRIL 2017...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 2017 WILL BE
AVAILABLE APPROXIMATELY IN JUNE 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

...APRIL WAS SLIGHTLY WARMER AND DRIER THAN NORMAL IN GREYBULL...

THE AVERAGE TEMPERATURE FOR GREYBULL IN APRIL WAS 47.6 DEGREES...
WHICH WAS 1.1 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH
WAS 80 DEGREES ON THE 13TH...SETTING A NEW RECORD HIGH. THIS BROKE
THE PREVIOUS RECORD OF 79...SET IN 2002. THE COLDEST READING WAS 27
DEGREES ON THE 5TH.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.51...WHICH WAS 72 PERCENT OF
NORMAL. THE WETTEST 24 HOUR PERIOD WAS THE 21ST...WHEN 0.19 INCHES
FELL...AND SETTING A NEW RECORD. THIS BROKE THE PREVIOUS RECORD OF
0.17...SET IN 2005. 0.08 OF AN INCH OF PRECIPITATION FELL ON THE
2ND...BREAKING THE PREVIOUS RECORD OF 0.07...SET IN 2014. 0.15 OF AN
INCH OF PRECIPITATION FELL ON THE 9TH...TYING THE PREVIOUS RECORD
SET IN 2005. THE HIGHEST WIND GUST WAS 61 MPH ON THE 17TH.

...THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 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              88   04/23/2012
                        04/29/2007
 LOW                5   04/21/2008
HIGHEST            80   04/13
LOWEST             27   04/05
AVG. MAXIMUM     59.5              60.6    -1.1
AVG. MINIMUM     35.7              32.3     3.4
MEAN             47.6              46.5     1.1
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     10
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         1.19   1999
 MINIMUM         0.10   2004
TOTALS           0.51              0.71   -0.20
DAILY AVG.       0.02              0.02    0.00
DAYS >= .01         6
DAYS >= .10         2
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.19   04/21 TO 04/21

DEGREE_DAYS
HEATING TOTAL     517               557     -40
 SINCE 7/1       7202              7399    -197
COOLING TOTAL       0                 1      -1
 SINCE 1/1          0                 1      -1
.................................................

WIND (MPH)
AVERAGE WIND SPEED              10.4
HIGHEST WIND SPEED/DIRECTION    51/330    DATE  04/17
HIGHEST GUST SPEED/DIRECTION    61/330    DATE  04/17

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           14
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY          4

AVERAGE RH (PERCENT)     54

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN               14     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                       4     FOG W/VIS <= 1/4 MILE      1
HAZE                      0

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

LOOKING AHEAD TO MAY 2017...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 66 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 38 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 75
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 47 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 1.65 INCHES.

$$



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