Helena weather by month

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

Temperature in Helena (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
30°F maximum daytime temperature in January in Helena30
37°F maximum daytime temperature in February in Helena37
43°F maximum daytime temperature in March in Helena43
54°F maximum daytime temperature in April in Helena54
64°F maximum daytime temperature in May in Helena64
73°F maximum daytime temperature in June in Helena73
82°F maximum daytime temperature in July in Helena82
82°F maximum daytime temperature in August in Helena82
68°F maximum daytime temperature in September in Helena68
57°F maximum daytime temperature in October in Helena57
41°F maximum daytime temperature in November in Helena41
32°F maximum daytime temperature in December in Helena32
Min temperature (night-time)
9°F minimum night-time temperature in January in Helena9
14°F minimum night-time temperature in February in Helena14
21°F minimum night-time temperature in March in Helena21
28°F minimum night-time temperature in April in Helena28
37°F minimum night-time temperature in May in Helena37
46°F minimum night-time temperature in June in Helena46
50°F minimum night-time temperature in July in Helena50
48°F minimum night-time temperature in August in Helena48
39°F minimum night-time temperature in September in Helena39
30°F minimum night-time temperature in October in Helena30
19°F minimum night-time temperature in November in Helena19
10°F minimum night-time temperature in December in Helena10
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

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
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

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 (inches)
0.7 inches monthly rainfall in January in Helena0.7
0.5 inches monthly rainfall in February in Helena0.5
0.8 inches monthly rainfall in March in Helena0.8
1.1 inches monthly rainfall in April in Helena1.1
2.0 inches monthly rainfall in May in Helena2.0
2.2 inches monthly rainfall in June in Helena2.2
1.3 inches monthly rainfall in July in Helena1.3
1.3 inches monthly rainfall in August in Helena1.3
1.2 inches monthly rainfall in September in Helena1.2
0.7 inches monthly rainfall in October in Helena0.7
0.6 inches monthly rainfall in November in Helena0.6
0.6 inches monthly rainfall in December in Helena0.6

More about Helena

Helena by month

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

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The climate guide for Montana (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.

What's the climate like in Helena?

Helena has a cold semi arid climate with warm summers.

Metric (°C)  |  Imperial (°F)

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More about the USA

Compare Helena with the USA

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

Maximum daytime temperature (°F)

Helena, Montana, USA
USA (Washington)
41
37
45
43
55
54
66
64
75
73
84
82
88
82
86
68
79
57
68
41
57
32
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
30

Metric (°C)  |  Imperial (°F)

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