Monthly weather forecast and climate
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
January, the same as December, in Helena, Montana, is another subzero cold winter month, with temperature in the range of an average high of 30.4°F (-0.9°C) and an average low of 16°F (-8.9°C). In Helena, the average high-temperature is almost the same as in December - a still freezing cold 30.4°F (-0.9°C). Weather in January »

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

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

April is a chilly spring month in Helena, Montana, with average temperature fluctuating between 28.8°F (-1.8°C) and 47.8°F (8.8°C). In Helena, the average high-temperature in April 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 »

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

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

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

August, the last month of the summer, in Helena, is also a moderately hot month, with temperature in the range of an average low of 50.2°F (10.1°C) and an average high of 78.1°F (25.6°C). In August, the average high-temperature is relatively the same as in July - a still warm 78.1°F (25.6°C). Weather in August »

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

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

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

The first month of the winter, December, is also a subzero cold month in Helena, Montana, with average temperature fluctuating between 14.2°F (-9.9°C) and 27.7°F (-2.4°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 »

What is the most humid month in Helena?

The most humid month in Helena is January, with an average relative humidity of 85%.

How much does it rain in Helena?

In Helena, during the entire year, the rain falls for 123.7 days and collects up to 12.4" (315mm) of precipitation.

What is the driest month in Helena?

January and December are months with the least rain when the rain falls for 8.4 days and typically aggregates up to 0.63" (16mm) of rain.

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?

January has the least sunshine of the year, 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.

When is 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.

What is the wettest month in Helena?

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

When it does not snow in Helena?

In Helena, Montana, snow does not fall in June through August.

When are the longest days in Helena?

June has the longest days of the year, with an average of 15.8h of daylight.

What is the warmest month in Helena?

The warmest month is July, with an average high-temperature of 80.2°F (26.8°C) and an average low-temperature of 50.4°F (10.2°C).

What are the least humid months in Helena?

July and August, with an average relative humidity of 46%, are the least humid months in Helena, Montana.

What month has the most sunshine in Helena?

The month with the most sunshine in Helena, Montana, is July, with an average of 11.7h of sunshine.

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

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

What is the coldest month in Helena?

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

What is the month with the shortest days in Helena?

With an average of 8.6h of daylight, December has the shortest days of the year in Helena, Montana.
Average pressure - Helena, MT

The month with the highest atmospheric pressure is January (1022mbar).
The month with the lowest atmospheric pressure is June (1012.5mbar).

Average wind speed - Helena, MT

The windiest month (with the highest average wind speed) is November (11.4km/h).
The calmest month (with the lowest average wind speed) is August (8.1km/h).

Average humidity - Helena, MT
Average rainfall - Helena, MT

The wettest month (with the highest rainfall) is June (51mm).
The driest months (with the least rainfall) are January and December (16mm).

Average rainfall days - Helena, MT
Average snowfall - Helena, MT
Average snowfall days - Helena, MT

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

Average daylight / Average sunshine - Helena, MT

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is January (Average sunshine: 5.6h).

Average sunshine days - Helena, MT
Average visibility - Helena, MT