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 (°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
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 (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 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.

Helena weather in January

Expect daytime maximum temperatures of -1°C in Helena, Montana in January based on long-term weather averages. There are 4 hours of sunshine per day on average, which might fall as snow.

  • -1°C maximum daytime temperature in January in Helena-1
    -1°C max day temperature
  • 4 hours of sunshine per day
  • 9 days with some rainfall in January in Helena9
    9 days with some rainfall
  • -13°C minimum night-time temperature in January in Helena-13
    -13°C min night temperature
  • 9 hours of daylight per day in January in Helena9
    9 hours of daylight per day
  • No heat & humidity in January in Helena0
    No heat & humidity
  • 17 mm monthly rainfall in January in Helena17
    17 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Helena1
    1 (Low) UV index

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Helena weather in February

Expect daytime maximum temperatures of 3°C in Helena, Montana in February based on long-term weather averages. There are 5 hours of sunshine per day on average, which might fall as snow.

  • 3°C maximum daytime temperature in February in Helena3
    3°C max day temperature
  • 5 hours of sunshine per day
  • 7 days with some rainfall in February in Helena7
    7 days with some rainfall
  • -10°C minimum night-time temperature in February in Helena-10
    -10°C min night temperature
  • 10 hours of daylight per day in February in Helena10
    10 hours of daylight per day
  • No heat & humidity in February in Helena0
    No heat & humidity
  • 12 mm monthly rainfall in February in Helena12
    12 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in February in Helena2
    2 (Low) UV index

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Helena weather in March

Expect daytime maximum temperatures of 6°C in Helena, Montana in March based on long-term weather averages. There are 7 hours of sunshine per day on average with 10 days with some rainfall, which might fall as snow.

  • 6°C maximum daytime temperature in March in Helena6
    6°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in March in Helena10
    10 days with some rainfall
  • -6°C minimum night-time temperature in March in Helena-6
    -6°C min night temperature
  • 12 hours of daylight per day in March in Helena12
    12 hours of daylight per day
  • No heat & humidity in March in Helena0
    No heat & humidity
  • 21 mm monthly rainfall in March in Helena21
    21 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in March in Helena3
    3 (Moderate) UV index

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Helena weather in April

Expect daytime maximum temperatures of 12°C in Helena, Montana in April based on long-term weather averages. There are 8 hours of sunshine per day on average.

  • 12°C maximum daytime temperature in April in Helena12
    12°C max day temperature
  • 8 hours of sunshine per day
  • 9 days with some rainfall in April in Helena9
    9 days with some rainfall
  • -2°C minimum night-time temperature in April in Helena-2
    -2°C min night temperature
  • 14 hours of daylight per day in April in Helena14
    14 hours of daylight per day
  • No heat & humidity in April in Helena0
    No heat & humidity
  • 28 mm monthly rainfall in April in Helena28
    28 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in April in Helena5
    5 (Moderate) UV index

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Helena weather in May

Expect daytime maximum temperatures of 18°C in Helena, Montana in May based on long-term weather averages. There are 9 hours of sunshine per day on average with 11 days with some rainfall and typically 51 mm of rainfall in the month.

  • 18°C maximum daytime temperature in May in Helena18
    18°C max day temperature
  • 9 hours of sunshine per day
  • 11 days with some rainfall in May in Helena11
    11 days with some rainfall
  • 3°C minimum night-time temperature in May in Helena3
    3°C min night temperature
  • 15 hours of daylight per day in May in Helena15
    15 hours of daylight per day
  • No heat & humidity in May in Helena0
    No heat & humidity
  • 51 mm monthly rainfall in May in Helena51
    51 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Helena7
    7 (High) UV index

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Helena weather in June

Expect daytime maximum temperatures of 23°C in Helena, Montana in June based on long-term weather averages. There are 10 hours of sunshine per day on average with 10 days with some rainfall and typically 55 mm of rainfall in the month.

  • 23°C maximum daytime temperature in June in Helena23
    23°C max day temperature
  • 10 hours of sunshine per day
  • 10 days with some rainfall in June in Helena10
    10 days with some rainfall
  • 8°C minimum night-time temperature in June in Helena8
    8°C min night temperature
  • 16 hours of daylight per day in June in Helena16
    16 hours of daylight per day
  • No heat & humidity in June in Helena0
    No heat & humidity
  • 55 mm monthly rainfall in June in Helena55
    55 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in June in Helena8
    8 (Very High) UV index

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Helena weather in July

Expect daytime maximum temperatures of 28°C in Helena, Montana in July based on long-term weather averages. There are 12 hours of sunshine per day on average.

  • 28°C maximum daytime temperature in July in Helena28
    28°C max day temperature
  • 12 hours of sunshine per day
  • 7 days with some rainfall in July in Helena7
    7 days with some rainfall
  • 10°C minimum night-time temperature in July in Helena10
    10°C min night temperature
  • 15 hours of daylight per day in July in Helena15
    15 hours of daylight per day
  • Low heat & humidity in July in HelenaL
    Low heat & humidity
  • 33 mm monthly rainfall in July in Helena33
    33 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in July in Helena9
    9 (Very High) UV index

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Helena weather in August

Expect daytime maximum temperatures of 28°C in Helena, Montana in August based on long-term weather averages. There are 10 hours of sunshine per day on average.

  • 28°C maximum daytime temperature in August in Helena28
    28°C max day temperature
  • 10 hours of sunshine per day
  • 8 days with some rainfall in August in Helena8
    8 days with some rainfall
  • 9°C minimum night-time temperature in August in Helena9
    9°C min night temperature
  • 14 hours of daylight per day in August in Helena14
    14 hours of daylight per day
  • Low heat & humidity in August in HelenaL
    Low heat & humidity
  • 34 mm monthly rainfall in August in Helena34
    34 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Helena8
    8 (Very High) UV index

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Helena weather in September

Expect daytime maximum temperatures of 20°C in Helena, Montana in September based on long-term weather averages. There are 8 hours of sunshine per day on average.

  • 20°C maximum daytime temperature in September in Helena20
    20°C max day temperature
  • 8 hours of sunshine per day
  • 7 days with some rainfall in September in Helena7
    7 days with some rainfall
  • 4°C minimum night-time temperature in September in Helena4
    4°C min night temperature
  • 13 hours of daylight per day in September in Helena13
    13 hours of daylight per day
  • No heat & humidity in September in Helena0
    No heat & humidity
  • 30 mm monthly rainfall in September in Helena30
    30 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Helena5
    5 (Moderate) UV index

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Helena weather in October

Expect daytime maximum temperatures of 14°C in Helena, Montana in October based on long-term weather averages. There are 7 hours of sunshine per day on average.

  • 14°C maximum daytime temperature in October in Helena14
    14°C max day temperature
  • 7 hours of sunshine per day
  • 6 days with some rainfall in October in Helena6
    6 days with some rainfall
  • -1°C minimum night-time temperature in October in Helena-1
    -1°C min night temperature
  • 11 hours of daylight per day in October in Helena11
    11 hours of daylight per day
  • No heat & humidity in October in Helena0
    No heat & humidity
  • 19 mm monthly rainfall in October in Helena19
    19 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in October in Helena3
    3 (Moderate) UV index

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Helena weather in November

Expect daytime maximum temperatures of 5°C in Helena, Montana in November based on long-term weather averages. There are 4 hours of sunshine per day on average, which might fall as snow.

  • 5°C maximum daytime temperature in November in Helena5
    5°C max day temperature
  • 4 hours of sunshine per day
  • 8 days with some rainfall in November in Helena8
    8 days with some rainfall
  • -7°C minimum night-time temperature in November in Helena-7
    -7°C min night temperature
  • 9 hours of daylight per day in November in Helena9
    9 hours of daylight per day
  • No heat & humidity in November in Helena0
    No heat & humidity
  • 16 mm monthly rainfall in November in Helena16
    16 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in November in Helena1
    1 (Low) UV index

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Helena weather in December

Expect daytime maximum temperatures of 0°C in Helena, Montana in December based on long-term weather averages. There are 3 hours of sunshine per day on average, which might fall as snow.

  • 0°C maximum daytime temperature in December in Helena0
    0°C max day temperature
  • 3 hours of sunshine per day
  • 9 days with some rainfall in December in Helena9
    9 days with some rainfall
  • -12°C minimum night-time temperature in December in Helena-12
    -12°C min night temperature
  • 9 hours of daylight per day in December in Helena9
    9 hours of daylight per day
  • No heat & humidity in December in Helena0
    No heat & humidity
  • 16 mm monthly rainfall in December in Helena16
    16 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Helena1
    1 (Low) UV index

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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.

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

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Compare Helena with the UK

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

Maximum daytime temperature (°C)

Helena, Montana, USA
UK (London)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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

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