246
CXUS55 KRIW 011337
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
637 AM MST THU JAN 01 2026

...................................

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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             46   12/12/2014
 LOW             -36   12/22/2022
HIGHEST           42   12/15
LOWEST           -15   12/28
AVG. MAXIMUM    31.3               23.3     8.0
AVG. MINIMUM    15.2                2.7    12.5
MEAN            23.2               13.0    10.2
DAYS MAX >= 90     0
DAYS MAX <= 32    16
DAYS MIN <= 32    29
DAYS MIN <= 0      3

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        5.15   2007
 MINIMUM        0.37   2000
TOTALS          5.42               2.35    3.07     1.33
DAILY AVG.      0.17               0.08    0.09
DAYS >= .01       20
DAYS >= .10       13
DAYS >= .50        4
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   1.12   12/24 TO 12/25
 STORM TOTAL    0.91

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

DEGREE DAYS
HEATING TOTAL   1287               1612    -325
 SINCE 7/1      4245               5119    -874
COOLING TOTAL      0                  0       0
 SINCE 1/1         1                  0       1
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              4.2
RESULTANT WIND SPEED/DIRECTION   1/250
HIGHEST WIND SPEED/DIRECTION    28/280    DATE  12/17
HIGHEST GUST SPEED/DIRECTION    53/260    DATE  12/17

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)     78

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                0     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW               10     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.

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