Annual mean 12°C · wettest around November · prevailing wind N
Warmest
27.7 °C
Coldest
0.6 °C
Wettest
38%
Windiest
6.0 m/s
Prevailing
N
3.3 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Montana over the whole year is 12°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about -2°C. The rainy (wet) season in Montana runs from October to May, peaking in November with a 33% chance of rain on a given day. The dry season is June to September; August is the driest month, at 14%. Winds in Montana are highest in February, averaging 3.5 m/s (13 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the N. The clearest skies in Montana come in August, when the sky is typically 36% covered; November is the cloudiest month, at 74%.
Month by month Montana climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
2°C
-2°C
-3°C
26%
68%
3.3 m/s
0
0
8
February
7°C
1°C
1°C
24%
65%
3.5 m/s
2
0
22
March
11°C
3°C
5°C
33%
63%
3.3 m/s
8
0
44
April
16°C
8°C
12°C
24%
59%
3.1 m/s
47
1
72
May
20°C
11°C
17°C
29%
63%
2.9 m/s
65
10
67
June
26°C
16°C
24°C
23%
51%
2.5 m/s
51
50
29
July
28°C
18°C
26°C
16%
38%
2.9 m/s
48
49
28
August
29°C
17°C
27°C
14%
36%
2.4 m/s
40
61
21
September
23°C
12°C
20°C
17%
46%
2.6 m/s
68
31
52
October
16°C
8°C
13°C
24%
49%
2.7 m/s
44
1
74
November
8°C
4°C
5°C
33%
74%
3.0 m/s
6
0
40
December
4°C
1°C
-1°C
30%
71%
3.3 m/s
0
0
10
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Montana weather by season
Year round, Montana has days of about 2°C at their warmest in January, its coolest month, and 29°C in August, its warmest; the coolest hours of the day run from -2°C to 18°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around November and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Montana weather in winterDecember to February
High 4°CLow -0°CRain 27%
Winter in Montana has typical daily highs of about 4°C and lows of about -0°C, with a 27% chance of rain on a given day.
Montana weather in springMarch to May
High 16°CLow 7°CRain 29%
Spring in Montana has typical daily highs of about 16°C and lows of about 7°C, with a 29% chance of rain on a given day.
Montana weather in summerJune to August
High 28°CLow 17°CRain 18%
Summer in Montana has typical daily highs of about 28°C and lows of about 17°C, with a 18% chance of rain on a given day.
Montana weather in autumnSeptember to November
High 16°CLow 8°CRain 25%
Autumn in Montana has typical daily highs of about 16°C and lows of about 8°C, with a 25% chance of rain on a given day.
When is the rainy season in Montana?
The rainy (wet) season in Montana runs from October to May, peaking in November with a 33% chance of rain on a given day. The dry season is June to September; August is the driest month, at 14%.
What time of year is Montana windiest?
Winds in Montana are highest in February, averaging 3.5 m/s (13 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the N.
What is the average temperature in Montana year round?
The average temperature in Montana over the whole year is 12°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about -2°C.