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 is a wintry winter month in Helena, Montana, with average temperature fluctuating between 33.3°F (0.7°C) and 12.9°F (-10.6°C). In Helena, the average high-temperature in January is relatively the same as in December - a wintry 33.3°F (0.7°C). Weather in January »
February, the last month of the winter, in Helena, is another cold month, with average temperature fluctuating between 16.9°F (-8.4°C) and 38.7°F (3.7°C). In Helena, the average high-temperature in February slightly increases, from a cold 33.3°F (0.7°C) in January, to a still wintry 38.7°F (3.7°C). Weather in February »

March, the first month of the spring, in Helena, is a frosty month, with average temperature ranging between min 24.3°F (-4.3°C) and max 48.2°F (9°C). In March, the average high-temperature rises, from a wintry 38.7°F (3.7°C) in February, to a frosty 48.2°F (9°C). Weather in March »

April in Helena, Montana, is a mild spring month, with temperature in the range of an average low of 32.2°F (0.1°C) and an average high of 57.7°F (14.3°C). In Helena, the average high-temperature increases, from a frosty 48.2°F (9°C) in March, to a mild 57.7°F (14.3°C). Weather in April »

May, the last month of the spring, in Helena, is an enjoyable month, with average temperature ranging between max 67.1°F (19.5°C) and min 40.8°F (4.9°C). In May, the average high-temperature rises, from a mild 57.7°F (14.3°C) in April, to a comfortable 67.1°F (19.5°C). Weather in May »

The first month of the summer, June, is a warm month in Helena, Montana, with average temperature ranging between max 75.7°F (24.3°C) and min 48.6°F (9.2°C). In June, the average high-temperature marginally rises, from an enjoyable 67.1°F (19.5°C) in May, to a moderately hot 75.7°F (24.3°C). Weather in June »

July, the same as June, is a moderately hot summer month in Helena, Montana, with average temperature ranging between min 54.3°F (12.4°C) and max 85.6°F (29.8°C). With an average high-temperature of 85.6°F (29.8°C) and an average low-temperature of 54.3°F (12.4°C), July is the warmest month. Weather in July »

August, the last month of the summer, in Helena, is another warm month, with average temperature varying between 84.6°F (29.2°C) and 52.2°F (11.2°C). In August, the average high-temperature is almost the same as in July - a still moderately hot 84.6°F (29.2°C). Weather in August »

The first month of the autumn, September, is still a pleasant month in Helena, Montana, with average temperature fluctuating between 72.7°F (22.6°C) and 43.2°F (6.2°C). In Helena, the average high-temperature decreases, from a warm 84.6°F (29.2°C) in August, to a pleasant 72.7°F (22.6°C). Weather in September »

October, like September, is another mild autumn month in Helena, Montana, with average temperature varying between 32.5°F (0.3°C) and 58.6°F (14.8°C). In Helena, the average high-temperature in October decreases, from an agreeable 72.7°F (22.6°C) in September, to a mild 58.6°F (14.8°C). Weather in October »

November, the last month of the autumn, in Helena, is another chilly month, with average temperature varying between 21.9°F (-5.6°C) and 43.2°F (6.2°C). In November, the average high-temperature plummets, from a mild 58.6°F (14.8°C) in October, to a chilly 43.2°F (6.2°C). Weather in November »

The first month of the winter, December, is still a freezing cold month in Helena, Montana, with average temperature varying between 31.6°F (-0.2°C) and 11.8°F (-11.2°C). With an average high-temperature of 31.6°F (-0.2°C) and an average low-temperature of 11.8°F (-11.2°C), December is the coldest month. Weather in December »

How much does it rain in Helena?

In Helena, Montana, during the entire year, the rain falls for 91.6 days and collects up to 11.2" (284.9mm) of precipitation.

When does it snow in Helena?

January through May, August through December are months with snowfall.

How many days does it snow in Helena?

Throughout the year, in Helena, Montana, there are 32.8 snowfall days, and 38.1" (967.8mm) of snow is accumulated.

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

Months with the lowest UV index in Helena are January, November and December, with an average maximum UV index of 1.

What is the driest month in Helena?

February is the month with the least rainfall. Rain falls for 5.9 days and accumulates 0.3" (7.6mm) of precipitation.

What is the wettest month in Helena?

June is the month with the most rainfall. Rain falls for 11.2 days and accumulates 2.1" (52.3mm) of precipitation.

When are the longest days in Helena?

The month with the longest days in Helena is June, with an average of 15.8h of daylight.

What is the warmest month in Helena?

The warmest month in Helena is July, with an average high-temperature of 85.6°F (29.8°C) and an average low-temperature of 54.3°F (12.4°C).

What is the least humid month in Helena?

The least humid month in Helena, Montana, is July, with an average relative humidity of 46.4%.

What month has the most sunshine in Helena?

July has the most sunshine of the year in Helena, Montana, with an average of 11.9h of sunshine.

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

With an average maximum UV index of 9, July is the month with the highest UV index.

What is the coldest month in Helena?

The coldest month in Helena, Montana, is December, with an average high-temperature of 31.6°F (-0.2°C) and an average low-temperature of 11.8°F (-11.2°C).

What is the most humid month in Helena?

With an average relative humidity of 68.1%, December is the most humid month in Helena.

When does it snow the most in Helena?

The month with the most snowfall in Helena, Montana, is December when snow falls for 6 days and typically aggregates up to 7.3" (185.4mm) of snow.

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.

What is the month with the least sunshine in Helena?

The month with the least sunshine in Helena, Montana, is December, with an average of 3.2h of sunshine.
Average temperature - Helena, MT
Average humidity - Helena, MT
Average rainfall - Helena, MT

The wettest month (with the highest rainfall) is June (52.3mm).
The driest month (with the lowest rainfall) is February (7.6mm).

Average rainfall days - Helena, MT

The month with the highest number of rainy days is June (11.2 days).
The month with the lowest number of rainy days is February (5.9 days).

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

The month with the highest number of snowfall days is December (6 days).
The month with the lowest number of snowfall days is July (0 days).

Average daylight / Average sunshine - Helena, MT