Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 012356
CLMCPR

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
533 PM MDT MON MAY 01 2023

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR CASPER FOR THE MONTH OF
APRIL 2023..

...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 2023 WILL BE
AVAILABLE IN APPROXIMATELY 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 COLDER AND MUCH SNOWIER THAN NORMAL FOR CASPER...

THE IMPORTANT TOPIC FOR APRIL IS THE AMOUNT OF SNOW THAT FELL SO IT
IS LISTED FIRST. SNOWFALL FOR THE MONTH WAS 39.0 INCHES WHICH IS
28.5 INCHES ABOVE NORMAL AND MAKING IT TIED FOR 2ND SNOWIEST APRIL.
THE SNOWIEST DAY WAS ON THE 3RD WITH 26.7 INCHES. THIS CRUSHED THE
1981 RECORD OF 9.1 INCHES. IT ALSO SET AN ALL-TIME HIGH DAILY
SNOWFALL RECORD EXCEEDING THE DEC 24TH 1982 AMOUNT OF 24.3 INCHES.
THE 4TH ALSO HAD RECORD SNOW WITH 9.3 INCHES BREAKING 4.9 INCHES
FROM 2009. APRIL 3RD-4TH ALSO SAW THE BIGGEST SNOWSTORM EVER ON
RECORD WITH A TOTAL OF 37.4 INCHES. THIS BROKE THE PREVIOUS RECORD
OF 31.3 INCHES FROM DEC 23RD-24TH 1982.

THE AVERAGE TEMPERATURE FOR CASPER IN APRIL WAS 39.3 DEGREES WHICH
WAS 3 DEGREES BELOW NORMAL. THE WARMEST READING FOR THE MONTH WAS 72
DEGREES ON THE 12TH. THE COLDEST TEMPERATURE WAS 3 DEGREES ON THE
5TH...WHICH BROKE THE 1982 RECORD OF 7. NO OTHER TEMPERATURE RECORDS
WERE BROKEN.

PRECIPITATION FOR THE MONTH WAS 1.49 INCHES...WHICH IS 106 PERCENT
OF NORMAL THE WETTEST 24-HOUR PERIOD WAS ON THE 3RD WHEN 0.9 INCHES
FELL. THIS BROKE THE 1981 RECORD OF 0.73 INCHES. THE 4TH HAD 0.37
INCHES AND BROKE THE 1958 RECORD OF 0.29 INCHES. THE HIGHEST WIND
GUST WAS 70 MPH FROM THE NORTHWEST ON THE 27TH

...THE CASPER WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 2023...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1939 TO 2023

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             84   04/30/1992
 LOW              -6   04/12/1997
HIGHEST           72   04/12
LOWEST             3   04/05
AVG. MAXIMUM    51.7               56.3    -4.6
AVG. MINIMUM    26.9               28.2    -1.3
MEAN            39.3               42.3    -3.0
DAYS MAX >= 90     0
DAYS MAX <= 32     4
DAYS MIN <= 32    23
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        5.75   1941
 MINIMUM        0.08   1992
TOTALS          1.49               1.41    0.08     1.98
DAILY AVG.      0.05               0.05    0.00
DAYS >= .01        9
DAYS >= .10        2
DAYS >= .50        1
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.90   04/03 TO 04/03
 STORM TOTAL    0.90

SNOWFALL (INCHES)
TOTALS          39.0               10.5    28.5
SINCE 7/1      134.2               69.1    65.1
SNOWDEPTH AVG.     2
DAYS >= 1.0        4

DEGREE DAYS
HEATING TOTAL    762                682      80
 SINCE 7/1      7643               6953     690
COOLING TOTAL      0                  0       0
 SINCE 1/1         0                  0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              13.4
RESULTANT WIND SPEED/DIRECTION   7/240
HIGHEST WIND SPEED/DIRECTION    54/350    DATE  04/27
HIGHEST GUST SPEED/DIRECTION    70/350    DATE  04/27

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.34
NUMBER OF DAYS FAIR           20
NUMBER OF DAYS PC              4
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     59

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       0
LIGHT RAIN                3     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                2     SNOW                       2
LIGHT SNOW               11     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      2
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 2023...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 60 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 32 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 73
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 42. THE AVERAGE MONTHLY
PRECIPITATION IS 2.21 INCHES. THE AVERAGE MONTHLY SNOWFALL IS 2.6
INCHES.

$$


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