Climate and monthly weather forecast
Helena, MT

The State Capital building of Montana in Helena city, set on a beautiful natural park
The State Capital building of Montana in Helena city, set on a beautiful natural park

Weather in January

January, the same as December, in Helena, Montana, is another subzero cold winter month, with an average temperature ranging between max 30.4°F (-0.9°C) and min 16°F (-8.9°C). In January, the average high-temperature is essentially the same as in December - a still subzero cold 30.4°F (-0.9°C). Weather in January »

Weather in February

February, the last month of the winter in Helena, is another freezing cold month, with temperature in the range of an average low of 14.7°F (-9.6°C) and an average high of 29.7°F (-1.3°C). In Helena, the average high-temperature in February is almost the same as in January - a still freezing cold 29.7°F (-1.3°C). Weather in February »

Weather in March

March, the first month of the spring in Helena, is a wintry month, with temperature in the range of an average low of 23.2°F (-4.9°C) and an average high of 39.7°F (4.3°C). In March, the average high-temperature increases from a subzero cold 29.7°F (-1.3°C) in February to a wintry 39.7°F (4.3°C). Weather in March »

Weather in April

April in Helena, Montana, is a chilly spring month, with an average temperature ranging between min 28.8°F (-1.8°C) and max 47.8°F (8.8°C). In April, the average high-temperature marginally rises from a cold 39.7°F (4.3°C) in March to a chilly 47.8°F (8.8°C). Weather in April »

Weather in May

May, the last month of the spring in Helena, is a moderate month, with an average temperature varying between 36.9°F (2.7°C) and 59.4°F (15.2°C). In May, the average high-temperature increases from a frosty 47.8°F (8.8°C) in April to a mild 59.4°F (15.2°C). Weather in May »

Weather in June

June, the first month of the summer in Helena, is an agreeable month, with an average temperature varying between 69.4°F (20.8°C) and 44.2°F (6.8°C). In Helena, Montana, the average high-temperature in June rises from a mild 59.4°F (15.2°C) in May to an agreeable 69.4°F (20.8°C). Weather in June »

Weather in July

July in Helena, Montana, is a moderately hot summer month, with an average temperature ranging between min 50.4°F (10.2°C) and max 80.2°F (26.8°C). With an average high-temperature of 80.2°F (26.8°C) and an average low-temperature of 50.4°F (10.2°C), July is the warmest month. Weather in July »

Weather in August

August, the last month of the summer in Helena, is another warm month, with an average temperature varying between 50.2°F (10.1°C) and 78.1°F (25.6°C). In Helena, the average high-temperature in August is almost the same as in July - a still warm 78.1°F (25.6°C). Weather in August »

Weather in September

September, the first month of the autumn in Helena, is still a pleasant month, with an average temperature fluctuating between 43.9°F (6.6°C) and 68.2°F (20.1°C). In Helena, Montana, the average high-temperature in September drops from a moderately hot 78.1°F (25.6°C) in August to an agreeable 68.2°F (20.1°C). Weather in September »

Weather in October

October, the same as September, is a cool autumn month in Helena, Montana, with an average temperature fluctuating between 32.7°F (0.4°C) and 51.3°F (10.7°C). In Helena, the average high-temperature in October plummets from a pleasant 68.2°F (20.1°C) in September to a fresh 51.3°F (10.7°C). Weather in October »

Weather in November

November, the last month of the autumn in Helena, is another cold month, with an average temperature ranging between min 22.1°F (-5.5°C) and max 37.4°F (3°C). In November, the average high-temperature decreases from a cool 51.3°F (10.7°C) in October to a wintry 37.4°F (3°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Helena, Montana, with an average temperature fluctuating between 27.7°F (-2.4°C) and 14.2°F (-9.9°C). December is the coldest month, with an average high-temperature of 27.7°F (-2.4°C) and an average low-temperature of 14.2°F (-9.9°C). Weather in December »
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FAQ

What is the most humid month in Helena?

With an average relative humidity of 85%, January is the most humid month.

What is the driest month in Helena?

The months with the least rainfall in Helena are January and December Rain falls for 8.4 days and accumulates 0.63" (16mm) of rain.

How many days does it rain in Helena?

Throughout the year, in Helena, Montana, there are 123.7 rainfall days, and 12.4" (315mm) of precipitation is accumulated.

When does it snow in Helena?

Months with snowfall in Helena, Montana, are January through May, September through December.

How many days does it snow in Helena?

In Helena, during the entire year, snow falls for 80.4 days and aggregates up to 34.88" (886mm) of snow.

What is the month with the least sunshine in Helena?

The month with the least sunshine is January, with an average of 5.6h of sunshine.

When does it snow the most in Helena?

The month with the most snowfall is February, when snow falls for 16.2 days and typically aggregates up to 6.18" (157mm) of snow.

What is the month with the lowest UV index in Helena?

The month with the lowest UV index in Helena, Montana, is February, with an average maximum UV index of 1.

When is Daylight Saving Time (DST) in Helena?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Helena, Montana, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from MDT to MST.

What is the rainiest month in Helena?

June is the month with the most rainfall in Helena. Rain falls for 13.3 days and accumulates 2.01" (51mm) of precipitation.

When it does not snow in Helena?

June through August are months without snowfall in Helena.

When are the longest days in Helena?

The month with the longest days is June, with an average of 15h and 46min of daylight.

What is the warmest month in Helena?

With an average high-temperature of 80.2°F (26.8°C) and an average low-temperature of 50.4°F (10.2°C), July is the warmest month in Helena, Montana.

What are the least humid months in Helena?

The months with the lowest humidity are July and August, with an average relative humidity of 46%.

What month has the most sunshine in Helena?

July has the most sunshine of the year in Helena, Montana, with an average of 11.7h of sunshine.

When is the highest UV index in Helena?

The month with the highest UV index is July, with an average maximum UV index of 6.

What is the coldest month in Helena?

December is the coldest month, with an average high-temperature of 27.7°F (-2.4°C) and an average low-temperature of 14.2°F (-9.9°C).

What is the month with the shortest days in Helena?

December has the shortest days of the year in Helena, Montana, with an average of 8h and 38min of daylight.

Average temperature
Helena, MT

Average temperature - Helena, MT

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (27.7°F).

The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is December (14.2°F).

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Average pressure
Helena, MT

Average pressure - Helena, MT

The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed
Helena, MT

Average wind speed - Helena, MT

The windiest month (with the highest average wind speed) is November (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity
Helena, MT

Average humidity - Helena, MT

The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (46%).

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Average rainfall
Helena, MT

Average rainfall - Helena, MT

The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and December (0.63").

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Average rainfall days
Helena, MT

Average rainfall days - Helena, MT

The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is November (7 days).

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Average snowfall
Helena, MT

Average snowfall - Helena, MT

The month with the highest snowfall is February (6.18").
The months with the least snowfall are June, July and August (0").

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Average snowfall days
Helena, MT

Average snowfall days - Helena, MT

The month with the highest number of snowfall days is February (16.2 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight / Average sunshine
Helena, MT

Average daylight / Average sunshine - Helena, MT

The month with the longest days is June (Average daylight: 15h and 46min).
The month with the shortest days is December (Average daylight: 8h and 38min).

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).

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Average sunshine days
Helena, MT

Average sunshine days - Helena, MT

The month with the most sunshine days is July (20.5 days).
The month with the least sunshine days is April (9.8 days).

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Average visibility
Helena, MT

Average visibility - Helena, MT

The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).

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