Helena climate guide

Temperature in Helena (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
-1°C maximum daytime temperature in January in Helena-1
3°C maximum daytime temperature in February in Helena3
6°C maximum daytime temperature in March in Helena6
12°C maximum daytime temperature in April in Helena12
18°C maximum daytime temperature in May in Helena18
23°C maximum daytime temperature in June in Helena23
28°C maximum daytime temperature in July in Helena28
28°C maximum daytime temperature in August in Helena28
20°C maximum daytime temperature in September in Helena20
14°C maximum daytime temperature in October in Helena14
5°C maximum daytime temperature in November in Helena5
0°C maximum daytime temperature in December in Helena0
Min temperature (night-time)
-13°C minimum night-time temperature in January in Helena-13
-10°C minimum night-time temperature in February in Helena-10
-6°C minimum night-time temperature in March in Helena-6
-2°C minimum night-time temperature in April in Helena-2
3°C minimum night-time temperature in May in Helena3
8°C minimum night-time temperature in June in Helena8
10°C minimum night-time temperature in July in Helena10
9°C minimum night-time temperature in August in Helena9
4°C minimum night-time temperature in September in Helena4
-1°C minimum night-time temperature in October in Helena-1
-7°C minimum night-time temperature in November in Helena-7
-12°C minimum night-time temperature in December in Helena-12

Sunshine & Daylight in Helena

  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 Helena9
10 hours of daylight per day in February in Helena10
12 hours of daylight per day in March in Helena12
14 hours of daylight per day in April in Helena14
15 hours of daylight per day in May in Helena15
16 hours of daylight per day in June in Helena16
15 hours of daylight per day in July in Helena15
14 hours of daylight per day in August in Helena14
13 hours of daylight per day in September in Helena13
11 hours of daylight per day in October in Helena11
9 hours of daylight per day in November in Helena9
9 hours of daylight per day in December in Helena9

Rainfall in Helena

  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 Helena9
7 days with some rainfall in February in Helena7
10 days with some rainfall in March in Helena10
9 days with some rainfall in April in Helena9
11 days with some rainfall in May in Helena11
10 days with some rainfall in June in Helena10
7 days with some rainfall in July in Helena7
8 days with some rainfall in August in Helena8
7 days with some rainfall in September in Helena7
6 days with some rainfall in October in Helena6
8 days with some rainfall in November in Helena8
9 days with some rainfall in December in Helena9
Average monthly rainfall (mm)
17 mm monthly rainfall in January in Helena17
12 mm monthly rainfall in February in Helena12
21 mm monthly rainfall in March in Helena21
28 mm monthly rainfall in April in Helena28
51 mm monthly rainfall in May in Helena51
55 mm monthly rainfall in June in Helena55
33 mm monthly rainfall in July in Helena33
34 mm monthly rainfall in August in Helena34
30 mm monthly rainfall in September in Helena30
19 mm monthly rainfall in October in Helena19
16 mm monthly rainfall in November in Helena16
16 mm monthly rainfall in December in Helena16

More climate for Helena

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Helena1
UV (maximum) index 2 (Low) in February in Helena2
UV (maximum) index 3 (Moderate) in March in Helena3
UV (maximum) index 5 (Moderate) in April in Helena5
UV (maximum) index 7 (High) in May in Helena7
UV (maximum) index 8 (Very High) in June in Helena8
UV (maximum) index 9 (Very High) in July in Helena9
UV (maximum) index 8 (Very High) in August in Helena8
UV (maximum) index 5 (Moderate) in September in Helena5
UV (maximum) index 3 (Moderate) in October in Helena3
UV (maximum) index 1 (Low) in November in Helena1
UV (maximum) index 1 (Low) in December in Helena1
Heat & Humidity
No heat & humidity in January in Helena0
No heat & humidity in February in Helena0
No heat & humidity in March in Helena0
No heat & humidity in April in Helena0
No heat & humidity in May in Helena0
No heat & humidity in June in Helena0
Low heat & humidity in July in HelenaL
Low heat & humidity in August in HelenaL
No heat & humidity in September in Helena0
No heat & humidity in October in Helena0
No heat & humidity in November in Helena0
No heat & humidity in December in Helena0

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

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

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

Helena

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More about Helena

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

The climate guide for Helena, Montana 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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