Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 012104
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
255 PM MDT TUE JUN 01 2021

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF MAY 2021...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 2021 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 WARMER AND RECORD WETTER THAN NORMAL IN
MAY...

AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN MAY WAS 39.4 DEGREES
WHICH WAS 1.0 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH
WAS 65 DEGREES ON THE 1ST AND THE COLDEST READING WAS 14 DEGREES ON
THE 9TH. THE RECORD HIGH ON THE 7TH HIT 62 DEGREES WHICH TIED THE
2004 DAILY RECORD.

TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 3.17 INCHES WHICH WAS
135 PERCENT OF NORMAL...WHICH MAKES IT THE 3RD WETTEST MAY SINCE
RECORDS STARTED IN 1998. THE WETTEST 24-HOUR PERIOD DURING THE MONTH
WAS THE 23RD WHEN 1.14 INCHES OF PRECIPITATION FELL. THE 4TH HAD
0.29 INCHES...WHICH BROKE 0.25 INCHES FROM 2003...AND THE 26TH HAD
0.5 INCHES...WHICH BROKE THE 2012 RECORD OF 0.49 INCHES. THE HIGHEST
WIND GUST WAS 37 MPH FROM THE WEST ON THE 1ST.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF MAY 2021...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             78   05/28/2003
 LOW               0   05/07/2010
HIGHEST           65   05/31
LOWEST            14   05/09
AVG. MAXIMUM    51.8               50.6     1.2
AVG. MINIMUM    27.0               26.3     0.7
MEAN            39.4               38.4     1.0
DAYS MAX >= 90     0
DAYS MAX <= 32     0
DAYS MIN <= 32    31
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        3.41   2004
 MINIMUM        0.42   2019
TOTALS          3.17               2.35    0.82     2.29
DAILY AVG.      0.10               0.08    0.02
DAYS >= .01       17
DAYS >= .10        7
DAYS >= .50        2
DAYS >= 1.00       1
GREATEST
 24 HR. TOTAL   1.14   05/23 TO 05/23
 STORM TOTAL    1.14

SNOWFALL (INCHES)
TOTALS            MM                 MM      MM
SINCE 7/1         MM                 MM      MM
SNOWDEPTH AVG.    MM
DAYS >= 1.0       MM

DEGREE DAYS
HEATING TOTAL    785                823     -38
 SINCE 7/1     10278              11473   -1195
COOLING TOTAL      0                  0       0
 SINCE 1/1         0                  0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              2.5
RESULTANT WIND SPEED/DIRECTION   1/100
HIGHEST WIND SPEED/DIRECTION    21/290    DATE  05/01
HIGHEST GUST SPEED/DIRECTION    37/270    DATE  05/01

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           31
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     68

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                0     SNOW                       0
LIGHT SNOW                4     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 JUNE 2021...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 56 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 31 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 68
DEGREES AND THE AVERAGE LOW TEMPERATURE IS 36 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 2.38 INCHES.

$$


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