244
CXUS55 KRIW 031755 CCA
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1045 AM MST MON NOV 03 2025

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

...OFFICIAL CLIMATE DATA FOR THE MONTH OF OCTOBER 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 OCTOBER...

AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN OCTOBER WAS 35.4 DEGREES
WHICH IS 1.8 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH
WAS 64 DEGREES ON THE 9TH. THE COLDEST READING OF THE MONTH WAS 4
DEGREES ON THE 28TH. NO TEMPERATURE RECORDS WERE BROKEN THIS MONTH.

TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 3.48 INCHES...WHICH WAS
188 PERCENT OF NORMAL. IT WAS THE 2ND WETTEST OCTOBER SINCE RECORDS
BEGAN IN 1998. THE WETTEST 24-HOUR PERIOD DURING THE MONTH WAS THE
11TH-12TH WHEN 0.85 INCHES OF PRECIPITATION FELL. THE 11TH HAD 0.74
INCHES AND BROKE THE 2021 RECORD OF 0.48. THE 12TH HAD 0.17 INCHES
AND TIED 200 AND 2001. THE 4TH HAD 0.84 INCHES AND BROKE THE 2018
RECORD OF 0.66. THE HIGHEST WIND GUST WAS 38 MPH FROM THE WEST ON
THE 19TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF OCTOBER
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             74   10/02/2010
 LOW             -16   10/26/2020
HIGHEST           64   10/09
LOWEST             4   10/28
AVG. MAXIMUM    46.6               45.5     1.1
AVG. MINIMUM    24.2               21.8     2.4
MEAN            35.4               33.6     1.8
DAYS MAX >= 90     0
DAYS MAX <= 32     2
DAYS MIN <= 32    25
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        5.78   2016
 MINIMUM        0.36   1998
TOTALS          3.48               1.85    1.63     0.60
DAILY AVG.      0.11               0.06    0.05
DAYS >= .01       14
DAYS >= .10        8
DAYS >= .50        2
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.85   10/11 TO 10/12
 STORM TOTAL    0.84

DEGREE DAYS
HEATING TOTAL    909                972     -63
 SINCE 7/1      1909               2201    -292
COOLING TOTAL      0                  0       0
 SINCE 1/1         1                  0       1
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              2.3
RESULTANT WIND SPEED/DIRECTION   0/320
HIGHEST WIND SPEED/DIRECTION    20/270    DATE  10/19
HIGHEST GUST SPEED/DIRECTION    38/280    DATE  10/19

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)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                4     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 NOVEMBER 2025. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 38 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 16 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 26
DEGREES AND THE AVERAGE LOW TEMPERATURE IS 6 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 2.06 INCHES.

$$