426
CXUS55 KMSO 012228
CLMMSO

CLIMATE REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
428 PM MDT THU OCT 01 2026

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...THE MISSOULA MT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2026...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1893 TO 2026

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             99   09/01/1967
 LOW              15   09/25/1926
HIGHEST           88   09/01         MM      MM       96
LOWEST            30   09/27         MM      MM       36
AVG. MAXIMUM    70.9               72.6    -1.7     81.2
AVG. MINIMUM    43.2               42.4     0.8     47.1
MEAN            57.1               57.5    -0.4     64.2
DAYS MAX >= 90     0                1.4    -1.4        3
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     1                1.7    -0.7        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        3.60   1985
 MINIMUM           T   2012
TOTALS          2.13               0.96    1.17     0.41
DAILY AVG.      0.07               0.03    0.04     0.01
DAYS >= .01       11                7.3     3.7        6
DAYS >= .10        6                3.0     3.0        1
DAYS >= .50        2                0.3     1.7        0
DAYS >= 1.00       0                0.0     0.0        0
GREATEST
 24 HR. TOTAL   1.09   09/06 TO 09/07               0.22

SNOWFALL (INCHES)
TOTALS           0.0                0.1    -0.1      0.0
SINCE 7/1        0.0                0.1    -0.1       MM
DAYS >= TRACE      0                0.0     0.0        0
DAYS >= 1.0        0                0.0     0.0        0
GREATEST
 SNOW DEPTH        0                                   0
 24 HR TOTAL      MM                                 0.0

DEGREE DAYS
HEATING TOTAL    229                240     -11
 SINCE 7/1       256                325     -69
COOLING TOTAL      2                 15     -13
 SINCE 1/1       390                307      83
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              4.9
HIGHEST WIND SPEED/DIRECTION    33/110    DATE  09/06
                                33/300          09/25
HIGHEST GUST SPEED/DIRECTION    47/260    DATE  09/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.31
NUMBER OF DAYS FAIR           18
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              5     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       5
LIGHT RAIN               14     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      1
HAZE                      1

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$