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
The average high-temperature, in Helena, is 33.3°F (0.7°C), while the average low-temperature is 12.9°F (-10.6°C). In January, the average relative humidity is 66%. Weather in January »
In February, in Helena, the average high-temperature is 38.7°F (3.7°C), and the average low-temperature is 16.9°F (-8.4°C). The average relative humidity in February is 64.1%. Weather in February »

In Helena, the average high-temperature is 48.2°F (9°C), and the average low-temperature is 24.3°F (-4.3°C). In March, the average relative humidity is 60.1%. Weather in March »

In April, the average high-temperature is 57.7°F (14.3°C), and the average low-temperature is 32.2°F (0.1°C). In April, the average relative humidity is 53.9%. Weather in April »

In May, in Helena, the average high-temperature is 67.1°F (19.5°C), and the average low-temperature is 40.8°F (4.9°C). In Helena, the average relative humidity is 53.5%. Weather in May »

The average high-temperature, is 75.7°F (24.3°C), while the average low-temperature is 48.6°F (9.2°C). The average relative humidity in June is 52.1%. Weather in June »

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

In Helena, in August, the average high-temperature is 84.6°F (29.2°C), and the average low-temperature is 52.2°F (11.2°C). The average relative humidity in August is 47.5%. Weather in August »

The average high-temperature, is 72.7°F (22.6°C), while the average low-temperature is 43.2°F (6.2°C). In Helena, the average relative humidity in September is 54.5%. Weather in September »

The average high-temperature, in October, is 58.6°F (14.8°C), while the average low-temperature is 32.5°F (0.3°C). The average relative humidity is 58.3%. Weather in October »

In November, the average high-temperature is 43.2°F (6.2°C), and the average low-temperature is 21.9°F (-5.6°C). In Helena, the average relative humidity is 64.8%. Weather in November »

The coldest month 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). The most humid month is December, with an average relative humidity of 68.1%. 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 in Helena.

How many days does it snow in Helena?

Throughout the year, in Helena, 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 UV index of 1.

What is the driest month in Helena?

The month with the least rainfall in Helena is February when the rain falls for 5.9 days and typically collects 0.3" (7.6mm) of precipitation.

What is the wettest month in Helena?

The month with the most rainfall in Helena is June when the rain falls for 11.2 days and typically aggregates up to 2.1" (52.3mm) of precipitation.

When are the longest days in Helena?

With an average of 15.8h of daylight, June has the longest days of the year in Helena, Montana.

What is the warmest month in Helena?

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 in Helena, Montana.

What is the least humid month in Helena?

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

What month has the most sunshine in Helena?

The month with the most sunshine in Helena, Montana, is July, with an average of 11.9h of sunshine.

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

July is the month with the highest UV index in Helena, with an average UV index of 9.

What is the coldest month in Helena?

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.

What is the most humid month in Helena?

December is the most humid month, with an average relative humidity of 68.1%.

What is the snowiest month 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?

The month with the shortest days in Helena, Montana, is December, with an average of 8.6h of daylight.

What is the month with the least sunshine in Helena?

With an average of 3.2h of sunshine, December has the least sunshine of the year.
Average temperature - Helena, MT
Average humidity - Helena, MT
Average rainfall - Helena, MT
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 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
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