Helena
Montana, USA
Long-term weather forecast
Long-term weather forecast

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 a freezing cold winter month, with average temperature fluctuating between 30.4°F (-0.9°C) and 12.9°F (-10.6°C). In January, the average high-temperature is essentially the same as in December - a still freezing cold 30.4°F (-0.9°C). Weather in January »

February, the last month of the winter, in Helena, is also a subzero cold month, with temperature in the range of an average low of 16.9°F (-8.4°C) and an average high of 29.7°F (-1.3°C). In Helena, the average high-temperature in February is essentially the same as in January - a still subzero 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 ranging between min 24.3°F (-4.3°C) and max 39.7°F (4.3°C). In March, the average high-temperature rises, from a freezing cold 29.7°F (-1.3°C) in February, to a cold 39.7°F (4.3°C). Weather in March »

April in Helena, Montana, is a chilly spring month, with average temperature fluctuating between 32.2°F (0.1°C) and 47.8°F (8.8°C). In April, the average high-temperature slightly increases, from a wintry 39.7°F (4.3°C) in March, to a chilly 47.8°F (8.8°C). Weather in April »

May, the last month of the spring, in Helena, is a moderate month, with average temperature varying between 40.8°F (4.9°C) and 59.4°F (15.2°C). In Helena, 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 »

June, the first month of the summer, in Helena, is a pleasant month, with temperature in the range of an average low of 48.6°F (9.2°C) and an average high of 69.4°F (20.8°C). In Helena, the average high-temperature increases, from a mild 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 fluctuating between 54.3°F (12.4°C) and 80.2°F (26.8°C). The warmest month is July, with an average high-temperature of 80.2°F (26.8°C) and an average low-temperature of 54.3°F (12.4°C). Weather in July »

The last month of the summer, August, is another warm month in Helena, Montana, with average temperature ranging between max 78.1°F (25.6°C) and min 52.2°F (11.2°C). In Helena, the average high-temperature is practically the same as in July - a still moderately hot 78.1°F (25.6°C). Weather in August »

The first month of the autumn, September, is also an agreeable month in Helena, Montana, with average temperature varying between 68.2°F (20.1°C) and 43.2°F (6.2°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 a cool autumn month in Helena, Montana, with average temperature ranging between max 51.3°F (10.7°C) and min 32.5°F (0.3°C). In Helena, the average high-temperature in October plummets, from a pleasant 68.2°F (20.1°C) in September, to a cool 51.3°F (10.7°C). Weather in October »

November, the last month of the autumn, in Helena, is another cold month, with average temperature varying between 21.9°F (-5.6°C) and 37.4°F (3°C). In Helena, the average high-temperature decreases, from a fresh 51.3°F (10.7°C) in October, to a wintry 37.4°F (3°C). Weather in November »

December, the first month of the winter, in Helena, is also a subzero cold month, with average temperature varying between 11.8°F (-11.2°C) and 27.7°F (-2.4°C). With an average high-temperature of 27.7°F (-2.4°C) and an average low-temperature of 11.8°F (-11.2°C), December is the coldest month. Weather in December »

What is the most humid month in Helena?

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

How much does it rain in Helena?

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

What is the driest month in Helena?

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

When does it snow in Helena?

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

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?

With an average of 5.6h of sunshine, January has the least sunshine of the year.

When does it snow the most in Helena?

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

What is the rainiest month in Helena?

June is the month with the most rainfall. 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 in Helena, Montana, is June, with an average of 15.8h of daylight.

What is the warmest month in Helena?

The warmest month in Helena, Montana, is July, with an average high-temperature of 80.2°F (26.8°C) and an average low-temperature of 54.3°F (12.4°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?

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

When is the highest UV index in Helena?

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

What is the coldest month in Helena?

The coldest month in Helena, Montana, is December, with an average high-temperature of 27.7°F (-2.4°C) and an average low-temperature of 11.8°F (-11.2°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 8.6h of daylight.
Average temperature - Helena, MT
Average humidity - Helena, MT
Average rainfall - Helena, MT

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

Average rainfall days - Helena, MT

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

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 lowest number of snowfall days are July and August (0 days).

Average daylight / Average sunshine - Helena, MT