Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 082222 CCA
CLMGEY

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
156 PM MDT WED MAY 2 2018

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE SOUTH BIG HORN COUNTY
AIRPORT NEAR GREYBULL FOR THE MONTH OF APRIL 2018...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 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

...APRIL WAS COOLER AND WETTER THAN NORMAL FOR GREYBULL...

THE AVERAGE TEMPERATURE FOR GREYBULL FOR THE MONTH OF APRIL WAS 44
DEGREES. THIS WAS 2.5 DEGREES BELOW NORMAL. THE WARMEST READING
OF THE MONTH WAS 83 DEGREES ON THE 28TH...AND THE COLDEST READING
WAS 12 DEGREES ON THE 3RD. TWO DAILY RECORD FOR LOW TEMPERATURE WERE
BROKEN...ONE ON THE 6TH WITH 18 DEGREES... TYING THE PREVIOUS RECORD
FROM 2009.  THEN ON THE 7TH...16 DEGREES BROKE THE PREVIOUS RECORD
OF 21 DEGREES SET IN 2008.  ONE HIGH RECORD WAS BROKEN...80 DEGREES
ON THE 16TH BROKE THE PREVIOUS RECORD HIGH OF 77 SET IN 2006.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.87....WHICH WAS 123 PERCENT
OF NORMAL. THIS MAKES IT THE 5TH WETTEST APRIL SINCE 1998. THE
WETTEST 24 HOUR PERIOD WAS THE 30TH...WHEN 0.31 INCHES FELL. THERE
WERE THREE NEW DAILY PRECIPITATION RECORDS SET THIS MONTH. THE 6TH
HAD 0.05 BREAKING 0.02 FROM 1999...THE 12TH HAD 0.13 INCHES FALL
TYING THE 2014 RECORD AND THE 17TH RECEIVED 0.18 INCHES
BREAKING THE 2006 RECORD OF 0.09. THE HIGHEST WIND GUST WAS 57 MPH
ON THE 17TH.

...THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 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              88   04/23/2012
                        04/29/2007
 LOW                5   04/21/2008
HIGHEST            83   04/28
LOWEST             12   04/03
AVG. MAXIMUM     57.4              60.6    -3.2
AVG. MINIMUM     30.8              32.3    -1.5
MEAN             44.0              46.5    -2.5
DAYS MAX >= 90      0
DAYS MAX <= 32      1
DAYS MIN <= 32     17
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         1.19   1999
 MINIMUM         0.10   2004
TOTALS           0.87              0.71    0.16
DAILY AVG.       0.03              0.02    0.01
DAYS >= .01         8
DAYS >= .10         4
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.31   04/30 TO 04/30

DEGREE_DAYS
HEATING TOTAL     604               557      47
 SINCE 7/1       7667              7399     268
COOLING TOTAL       0                 1      -1
 SINCE 1/1          0                 1      -1
.................................................

WIND (MPH)
AVERAGE WIND SPEED              8.3
HIGHEST WIND SPEED/DIRECTION    41/340    DATE  04/17
HIGHEST GUST SPEED/DIRECTION    57/330    DATE  04/17

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           19
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     62

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                7     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       3
LIGHT SNOW                4     SLEET                      0
FOG                       6     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 2018...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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