Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 030016
CLMGEY

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
616 PM MDT THU MAY 2 2019

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE SOUTH BIG HORN COUNTY
AIRPORT NEAR GREYBULL FOR THE MONTH OF APRIL 2019...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 2019 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 RECORD WARMER AND DRIER THAN NORMAL FOR GREYBULL...

THE AVERAGE TEMPERATURE FOR GREYBULL FOR THE MONTH OF APRIL WAS
47.9 DEGREES. THIS WAS 1.4 DEGREES ABOVE NORMAL...MAKING IT THE 9TH
WARMEST APRIL ON RECORD SINCE 1998. THE WARMEST READING OF THE MONTH
WAS 78 DEGREES ON THE 19TH...AND THE COLDEST WAS 18 DEGREES ON THE
12TH...WHICH SET A NEW DAILY RECORD BEATING 22 FROM 1999. THREE
OTHER RECORDS WERE ALSO SET...78 DEGREES ON THE 19TH BREAKING 77
FROM 2008...76 DEGREES ON THE 20TH TIED THE RECORD FROM 2009...AND 24
DEGREES ON THE 29TH ALSO TYING THE RECORD...THIS ONE FROM 2005.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.49 INCHES....WHICH WAS 69
PERCENT OF NORMAL. THIS MAKES IT THE 9TH DRIEST APRIL SINCE 1998.
THE WETTEST 24 HOUR PERIOD WAS ON THE 21ST...WHEN 0.27 INCHES FELL.
THIS BROKE THE PREVIOUS RECORD OF 0.19 SET IN 2017.
THE HIGHEST WIND GUST WAS 61 MPH ON THE 28TH.

...THE GREYBULL WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 2019...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2019

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            78   04/19
LOWEST             18   04/12
AVG. MAXIMUM     61.1              60.6     0.5
AVG. MINIMUM     34.8              32.3     2.5
MEAN             47.9              46.5     1.4
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      8
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         1.19   1999
 MINIMUM         0.10   2004
TOTALS           0.49              0.71   -0.22
DAILY AVG.       0.02              0.02    0.00
DAYS >= .01         7
DAYS >= .10         1
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.27   04/21 TO 04/21

DEGREE_DAYS
HEATING TOTAL     505               557     -52
 SINCE 7/1       7503              7399     104
COOLING TOTAL       0                 1      -1
 SINCE 1/1          0                 1      -1
.................................................

WIND (MPH)
AVERAGE WIND SPEED              9.5
HIGHEST WIND SPEED/DIRECTION    48/330    DATE  04/28
HIGHEST GUST SPEED/DIRECTION    61/340    DATE  04/28

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           13
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     55

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP                0
HEAVY RAIN                0     RAIN                        1
LIGHT RAIN               10     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       0
HAZE                      2

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

LOOKING AHEAD TO MAY 2019...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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