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000
CXUS55 KRIW 020000
CLMP60

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF APRIL 2023...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF APRIL 2023 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

...LAKE YELLOWSTONE WAS COLDER AND DRIER THAN NORMAL IN APRIL...

AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN APRIL WAS 24.6 DEGREES
WHICH WAS 4.1 DEGREES BELOW NORMAL. IT WAS THE 4TH COLDEST APRIL ON
RECORD. THE WARMEST READING OF THE MONTH WAS 59 DEGREES ON THE 29TH.
THE HIGH OF 57 DEGREES ON THE 10 BROKE THE 2003 RECORD OF 52. THE
COLDEST READING OF THE MONTH WAS ON THE 5TH WITH 14 DEGREES BELOW
ZERO. THIS BROKE THE 2009 RECORD OF 12 BELOW. A LOW ON THE 7TH OF 7
BELOW BROKE 4 BELOW FROM 2009. THE 20TH LOW OF 1 BELOW BROKE THE
2011 RECORD OF 1 DEGREE. THE 22ND LOW OF 0 BROKE THE 2008 RECORD OF
5 DEGREES.

TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 1.9 INCHES...WHICH WAS
83 PERCENT OF NORMAL. THE WETTEST 24-HOUR PERIOD DURING THE MONTH
WAS THE 12TH-13TH WHEN 0.62 INCHES OF PRECIPITATION FELL. THE 1ST
HAD 0.55 INCHES WHICH BROKE THE 2020 RECORD OF 0.29. THE HIGHEST
WIND GUST WAS 38 MPH FROM THE NORTHWEST ON THE 1ST.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF APRIL
2023...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2023

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             65   04/29/2007
 LOW             -18   04/13/2022
HIGHEST           59   04/29
LOWEST           -14   04/05
AVG. MAXIMUM    39.3               40.9    -1.6
AVG. MINIMUM    10.0               16.6    -6.6
MEAN            24.6               28.7    -4.1
DAYS MAX >= 90     0
DAYS MAX <= 32    10
DAYS MIN <= 32    30
DAYS MIN <= 0      9

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        4.59   2011
 MINIMUM        0.76   2008
TOTALS          1.90               2.28   -0.38     3.50
DAILY AVG.      0.06               0.08   -0.02
DAYS >= .01       14
DAYS >= .10        7
DAYS >= .50        1
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.62   04/12 TO 04/13
 STORM TOTAL    0.55

DEGREE DAYS
HEATING TOTAL   1203               1088     115
 SINCE 7/1     10766              10651     115
COOLING TOTAL      0                  0       0
 SINCE 1/1         0                  0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              2.7
RESULTANT WIND SPEED/DIRECTION   0/260
HIGHEST WIND SPEED/DIRECTION    22/280    DATE  04/01
HIGHEST GUST SPEED/DIRECTION    38/300    DATE  04/01

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           30
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     67

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                2     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       3
LIGHT SNOW                8     SLEET                      0
FOG                       0     FOG W/VIS <= 1/4 MILE      0
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 2023...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 46 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 21 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 55
DEGREES AND THE AVERAGE LOW TEMPERATURE IS 30 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 2.35 INCHES.

$$