Montana climate guide

Temperature in Montana (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
-1°C maximum daytime temperature in January in Montana (Helena)-1
3°C maximum daytime temperature in February in Montana (Helena)3
6°C maximum daytime temperature in March in Montana (Helena)6
12°C maximum daytime temperature in April in Montana (Helena)12
18°C maximum daytime temperature in May in Montana (Helena)18
23°C maximum daytime temperature in June in Montana (Helena)23
28°C maximum daytime temperature in July in Montana (Helena)28
28°C maximum daytime temperature in August in Montana (Helena)28
20°C maximum daytime temperature in September in Montana (Helena)20
14°C maximum daytime temperature in October in Montana (Helena)14
5°C maximum daytime temperature in November in Montana (Helena)5
0°C maximum daytime temperature in December in Montana (Helena)0
Min temperature (night-time)
-13°C minimum night-time temperature in January in Montana (Helena)-13
-10°C minimum night-time temperature in February in Montana (Helena)-10
-6°C minimum night-time temperature in March in Montana (Helena)-6
-2°C minimum night-time temperature in April in Montana (Helena)-2
3°C minimum night-time temperature in May in Montana (Helena)3
8°C minimum night-time temperature in June in Montana (Helena)8
10°C minimum night-time temperature in July in Montana (Helena)10
9°C minimum night-time temperature in August in Montana (Helena)9
4°C minimum night-time temperature in September in Montana (Helena)4
-1°C minimum night-time temperature in October in Montana (Helena)-1
-7°C minimum night-time temperature in November in Montana (Helena)-7
-12°C minimum night-time temperature in December in Montana (Helena)-12

Sunshine & Daylight in Montana

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
4 hours of sunshine per day (43% of daylight hours) in January in Montana4
5 hours of sunshine per day (51% of daylight hours) in February in Montana5
7 hours of sunshine per day (60% of daylight hours) in March in Montana7
8 hours of sunshine per day (59% of daylight hours) in April in Montana8
9 hours of sunshine per day (60% of daylight hours) in May in Montana9
10 hours of sunshine per day (65% of daylight hours) in June in Montana10
12 hours of sunshine per day (77% of daylight hours) in July in Montana12
10 hours of sunshine per day (73% of daylight hours) in August in Montana10
8 hours of sunshine per day (66% of daylight hours) in September in Montana8
7 hours of sunshine per day (60% of daylight hours) in October in Montana7
4 hours of sunshine per day (42% of daylight hours) in November in Montana4
3 hours of sunshine per day (37% of daylight hours) in December in Montana3
Daily hours of daylight
9 hours of daylight per day in January in Montana (Helena)9
10 hours of daylight per day in February in Montana (Helena)10
12 hours of daylight per day in March in Montana (Helena)12
14 hours of daylight per day in April in Montana (Helena)14
15 hours of daylight per day in May in Montana (Helena)15
16 hours of daylight per day in June in Montana (Helena)16
15 hours of daylight per day in July in Montana (Helena)15
14 hours of daylight per day in August in Montana (Helena)14
13 hours of daylight per day in September in Montana (Helena)13
11 hours of daylight per day in October in Montana (Helena)11
9 hours of daylight per day in November in Montana (Helena)9
9 hours of daylight per day in December in Montana (Helena)9

Rainfall in Montana

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
9 days with some rainfall in January in Montana (Helena)9
7 days with some rainfall in February in Montana (Helena)7
10 days with some rainfall in March in Montana (Helena)10
9 days with some rainfall in April in Montana (Helena)9
11 days with some rainfall in May in Montana (Helena)11
10 days with some rainfall in June in Montana (Helena)10
7 days with some rainfall in July in Montana (Helena)7
8 days with some rainfall in August in Montana (Helena)8
7 days with some rainfall in September in Montana (Helena)7
6 days with some rainfall in October in Montana (Helena)6
8 days with some rainfall in November in Montana (Helena)8
9 days with some rainfall in December in Montana (Helena)9
Average monthly rainfall (mm)
17 mm monthly rainfall in January in Montana (Helena)17
12 mm monthly rainfall in February in Montana (Helena)12
21 mm monthly rainfall in March in Montana (Helena)21
28 mm monthly rainfall in April in Montana (Helena)28
51 mm monthly rainfall in May in Montana (Helena)51
55 mm monthly rainfall in June in Montana (Helena)55
33 mm monthly rainfall in July in Montana (Helena)33
34 mm monthly rainfall in August in Montana (Helena)34
30 mm monthly rainfall in September in Montana (Helena)30
19 mm monthly rainfall in October in Montana (Helena)19
16 mm monthly rainfall in November in Montana (Helena)16
16 mm monthly rainfall in December in Montana (Helena)16

More climate for Montana

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Montana (Helena)1
UV (maximum) index 2 (Low) in February in Montana (Helena)2
UV (maximum) index 3 (Moderate) in March in Montana (Helena)3
UV (maximum) index 5 (Moderate) in April in Montana (Helena)5
UV (maximum) index 7 (High) in May in Montana (Helena)7
UV (maximum) index 8 (Very High) in June in Montana (Helena)8
UV (maximum) index 9 (Very High) in July in Montana (Helena)9
UV (maximum) index 8 (Very High) in August in Montana (Helena)8
UV (maximum) index 5 (Moderate) in September in Montana (Helena)5
UV (maximum) index 3 (Moderate) in October in Montana (Helena)3
UV (maximum) index 1 (Low) in November in Montana (Helena)1
UV (maximum) index 1 (Low) in December in Montana (Helena)1
Heat & Humidity
No heat & humidity in January in Montana (Helena)0
No heat & humidity in February in Montana (Helena)0
No heat & humidity in March in Montana (Helena)0
No heat & humidity in April in Montana (Helena)0
No heat & humidity in May in Montana (Helena)0
No heat & humidity in June in Montana (Helena)0
Low heat & humidity in July in Montana (Helena)L
Low heat & humidity in August in Montana (Helena)L
No heat & humidity in September in Montana (Helena)0
No heat & humidity in October in Montana (Helena)0
No heat & humidity in November in Montana (Helena)0
No heat & humidity in December in Montana (Helena)0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Going to Montana? Find the best month to visit Montana based on the weather.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Check climate guides for Montana showing average temperature, rainfall & sunshine figures for each month of the year. The climate guide shown above is for Helena.

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More about Montana

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

The climate guide for Montana, represented by Helena, shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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