482
CXUS55 KRIW 291804
CLAP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1034 AM MST THU JAN 29 2026

...PRELIMINARY ANNUAL CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR
2025...

...1ST WARMEST YEAR AT 36.7 DEGREES (4.7 DEGREES ABOVE NORMAL)
(PREVIOUS RECORD WAS 2012 AT 35.4 DEGREES)
...7TH WARMEST SUMMER AT 54.3 DEGREES
...9TH WETTEST YEAR WITH 25.56 INCHES. (110.7% OF NORMAL)

...HOT AND COLD MONTHS: 5TH COLDEST JAN, 6TH WARMEST MAR, 9TH
WARMEST APR, 3RD WARMEST MAY, 7TH WARMEST JUN, 9TH WARMEST AUGUST,
5TH WARMEST SEPTEMBER, 1ST WARMEST NOVEMBER, AND 1ST WARMEST
DECEMBER.

...WET AND DRY MONTHS: 10TH WETTEST APRIL, 3RD DRIEST JUN, 10TH
DRIEST JUN, 2ND WETTEST OCTOBER, 5TH DRIEST NOVEMBER, AND 2ND
WETTEST DECEMBER.

...HOT DAYS: APR 11TH 58F, APR 15TH 54F, APR 16TH 53F, MAY 10TH 68F,
MAY 31ST 73F, JUN 1ST 75F, JUN 19TH 78F, JUL 8TH 81F, AUG 23RD 80F,
SEP 20TH 69 (T 2012), NOV 21ST 43 (T 2006); DEC 10TH 36F (T 2004,
2014), DEC 13TH 40F, DEC 14TH 40F, DEC 15TH 42F, DEC 16TH 39F, DEC
23RD 39F, DEC 24TH 39F, AND DEC 25TH 37F.

...COLD DAYS: JAN 19TH -21F, JAN 20TH -34F, JAN 23RD -16F, JAN 25TH -
20F, JAN 26TH -26F, FEB 13TH -30F, JUN 6TH 27 (T 2003), JUN 23RD 27F
(T 2003), JUN 24TH 26F, AND JUL 6TH 31F.

...WET DAYS: JAN 3RD 0.23 (T 2001) JAN 24TH 0.09, FEB 2ND 0.74,
MAY 18TH 0.82, JUL 30TH 0.25, AUG 28TH 0.68, SEP 7TH 0.76, OCT
4TH 0.84, OCT 11TH 0.74, OCT 12TH 0.17, DEC 21ST 0.65, DEC 22ND
0.64, DEC 24TH 0.45, AND DEC 25TH 0.91.

...PEAK WIND: APRIL 12TH 230/47 MPH. DECEMBER 17TH 260/53 MPH.


...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE YEAR OF 2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2026

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             86   07/14/2002
                       08/01/2000
                       07/31/2000
 LOW             -42   01/30/2023
HIGHEST           82                 MM
LOWEST           -34                 MM
AVG. MAXIMUM    50.2                        5.1
AVG. MINIMUM    25.9                        7.0
MEAN            36.7

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       27.97   2022
 MINIMUM       19.71   2024
TOTALS         25.56              23.09    2.47


DEGREE DAYS
HEATING TOTAL  10167
COOLING TOTAL      1
..............................................................

WIND (MPH)
HIGHEST WIND SPEED/DIRECTION    28/280    DATE  12/17
HIGHEST GUST SPEED/DIRECTION    53/260    DATE  12/17


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              7     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       4
LIGHT RAIN               69     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       2
LIGHT SNOW               69     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.

$$