Great Falls weather by month

Check out Great Falls weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Great Falls (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
28°F maximum daytime temperature in January in Great Falls28
37°F maximum daytime temperature in February in Great Falls37
43°F maximum daytime temperature in March in Great Falls43
55°F maximum daytime temperature in April in Great Falls55
64°F maximum daytime temperature in May in Great Falls64
73°F maximum daytime temperature in June in Great Falls73
82°F maximum daytime temperature in July in Great Falls82
82°F maximum daytime temperature in August in Great Falls82
70°F maximum daytime temperature in September in Great Falls70
59°F maximum daytime temperature in October in Great Falls59
45°F maximum daytime temperature in November in Great Falls45
32°F maximum daytime temperature in December in Great Falls32
Min temperature (night-time)
10°F minimum night-time temperature in January in Great Falls10
18°F minimum night-time temperature in February in Great Falls18
21°F minimum night-time temperature in March in Great Falls21
32°F minimum night-time temperature in April in Great Falls32
41°F minimum night-time temperature in May in Great Falls41
48°F minimum night-time temperature in June in Great Falls48
54°F minimum night-time temperature in July in Great Falls54
52°F minimum night-time temperature in August in Great Falls52
43°F minimum night-time temperature in September in Great Falls43
36°F minimum night-time temperature in October in Great Falls36
23°F minimum night-time temperature in November in Great Falls23
14°F minimum night-time temperature in December in Great Falls14
Heat & Humidity
No heat & humidity in January in Great Falls0
No heat & humidity in February in Great Falls0
No heat & humidity in March in Great Falls0
No heat & humidity in April in Great Falls0
No heat & humidity in May in Great Falls0
No heat & humidity in June in Great Falls0
Low heat & humidity in July in Great FallsL
Low heat & humidity in August in Great FallsL
No heat & humidity in September in Great Falls0
No heat & humidity in October in Great Falls0
No heat & humidity in November in Great Falls0
No heat & humidity in December in Great Falls0

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

Sunshine & Daylight in Great Falls

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
9 hours of daylight per day in January in Great Falls9
10 hours of daylight per day in February in Great Falls10
12 hours of daylight per day in March in Great Falls12
14 hours of daylight per day in April in Great Falls14
15 hours of daylight per day in May in Great Falls15
16 hours of daylight per day in June in Great Falls16
15 hours of daylight per day in July in Great Falls15
14 hours of daylight per day in August in Great Falls14
13 hours of daylight per day in September in Great Falls13
11 hours of daylight per day in October in Great Falls11
9 hours of daylight per day in November in Great Falls9
9 hours of daylight per day in December in Great Falls9
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Great Falls1
UV (maximum) index 2 (Low) in February in Great Falls2
UV (maximum) index 3 (Moderate) in March in Great Falls3
UV (maximum) index 5 (Moderate) in April in Great Falls5
UV (maximum) index 6 (High) in May in Great Falls6
UV (maximum) index 8 (Very High) in June in Great Falls8
UV (maximum) index 8 (Very High) in July in Great Falls8
UV (maximum) index 7 (High) in August in Great Falls7
UV (maximum) index 5 (Moderate) in September in Great Falls5
UV (maximum) index 3 (Moderate) in October in Great Falls3
UV (maximum) index 1 (Low) in November in Great Falls1
UV (maximum) index 1 (Low) in December in Great Falls1

Rainfall in Great Falls

  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 Great Falls9
7 days with some rainfall in February in Great Falls7
9 days with some rainfall in March in Great Falls9
9 days with some rainfall in April in Great Falls9
12 days with some rainfall in May in Great Falls12
11 days with some rainfall in June in Great Falls11
7 days with some rainfall in July in Great Falls7
8 days with some rainfall in August in Great Falls8
7 days with some rainfall in September in Great Falls7
5 days with some rainfall in October in Great Falls5
6 days with some rainfall in November in Great Falls6
9 days with some rainfall in December in Great Falls9
Average monthly rainfall (inches)
0.8 inches monthly rainfall in January in Great Falls0.8
0.6 inches monthly rainfall in February in Great Falls0.6
0.9 inches monthly rainfall in March in Great Falls0.9
1.2 inches monthly rainfall in April in Great Falls1.2
2.5 inches monthly rainfall in May in Great Falls2.5
2.8 inches monthly rainfall in June in Great Falls2.8
1.3 inches monthly rainfall in July in Great Falls1.3
1.4 inches monthly rainfall in August in Great Falls1.4
1.0 inches monthly rainfall in September in Great Falls1.0
0.7 inches monthly rainfall in October in Great Falls0.7
0.6 inches monthly rainfall in November in Great Falls0.6
0.7 inches monthly rainfall in December in Great Falls0.7

More about Great Falls

Great Falls by month

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

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The climate guide for Montana (Great Falls) 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.

What's the climate like in Great Falls?

Great Falls has a cold semi arid climate with warm summers.

Metric (°C)  |  Imperial (°F)

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More about the USA

Compare Great Falls with the USA

Below the Great Falls chart shows average maximum daytime temperature for Great Falls, Montana, USA and the USA (Washington).

Maximum daytime temperature (°F)

Great Falls, Montana, USA
USA (Washington)
41
37
45
43
55
55
66
64
75
73
84
82
88
82
86
70
79
59
68
45
57
32
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
28

Metric (°C)  |  Imperial (°F)

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