676
CXUS55 KRIW 021724
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1111 AM MDT MON JUN 02 2025

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF MAY 2025...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 2025 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 WETTER THAN NORMAL IN MAY...

AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN MAY WAS 41.7 DEGREES
WHICH IS 3.3 DEGREES ABOVE NORMAL. IT WAS THE 3RD WARMEST MAY SINCE
RECORDS BEGAN IN 1998. THE WARMEST READING OF THE MONTH WAS 75
DEGREES ON THE 31ST. THIS BROKE THE 2002 RECORD OF 71 DEGREES. THE
10TH HIGH OF 68 BROKE THE 2007 RECORD OF 63. THE COLDEST READING OF
THE MONTH WAS 19 DEGREES ON THE 2ND.

TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 2.45 INCHES...WHICH WAS
104 PERCENT OF NORMAL. THE WETTEST 24-HOUR PERIOD DURING THE MONTH
WAS THE 18TH-19TH WHEN 0.83 INCHES OF PRECIPITATION FELL. THE 18TH
HAD 0.82 INCHES AND BROKE THE 2013 RECORD OF 0.46. THE HIGHEST WIND
GUST WAS 31 MPH FROM THE SOUTHWEST ON THE 11TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF MAY
2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2025

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           75   05/31
LOWEST            19   05/02
AVG. MAXIMUM    55.2               50.6     4.6
AVG. MINIMUM    28.2               26.3     1.9
MEAN            41.7               38.4     3.3
DAYS MAX >= 90     0
DAYS MAX <= 32     0
DAYS MIN <= 32    30
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        4.53   2022
 MINIMUM        0.42   2019
TOTALS          2.45               2.35    0.10     2.40
DAILY AVG.      0.08               0.08    0.00
DAYS >= .01       15
DAYS >= .10        7
DAYS >= .50        1
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.83   05/18 TO 05/19
 STORM TOTAL    0.82

DEGREE DAYS
HEATING TOTAL    717                823    -106
 SINCE 7/1      8832              11473   -2641
COOLING TOTAL      0                  0       0
 SINCE 1/1         0                  0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              1.9
RESULTANT WIND SPEED/DIRECTION   0/090
HIGHEST WIND SPEED/DIRECTION    14/280    DATE  05/29
                                14/260          05/27
                                14/270          05/15
HIGHEST GUST SPEED/DIRECTION    31/240    DATE  05/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           18
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     69

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN               15     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                5     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 2025. 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.

$$