Great Falls
Montana, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Great Falls, MT

January in Great Falls, Montana, is a cold winter month, with average temperature fluctuating between 32.4°F (0.2°C) and 19.8°F (-6.8°C). In January, the average high-temperature is almost the same as in December - a cold 32.4°F (0.2°C). Weather in January »

February, the last month of the winter, in Great Falls, is also a subzero cold month, with temperature in the range of an average low of 18.3°F (-7.6°C) and an average high of 31.6°F (-0.2°C). In Great Falls, the average high-temperature is almost the same as in January - a subzero cold 31.6°F (-0.2°C). Weather in February »

The first month of the spring, March, is a chilly month in Great Falls, Montana, with average temperature varying between 27°F (-2.8°C) and 43.3°F (6.3°C). In Great Falls, the average high-temperature rises, from a freezing cold 31.6°F (-0.2°C) in February, to a frosty 43.3°F (6.3°C). Weather in March »

April is a cool spring month in Great Falls, Montana, with average temperature ranging between min 34.9°F (1.6°C) and max 52.3°F (11.3°C). In April, the average high-temperature rises, from a frosty 43.3°F (6.3°C) in March, to a fresh 52.3°F (11.3°C). Weather in April »

May, the last month of the spring, in Great Falls, is a comfortable month, with average temperature varying between 63°F (17.2°C) and 42.6°F (5.9°C). In May, the average high-temperature increases, from a fresh 52.3°F (11.3°C) in April, to an enjoyable 63°F (17.2°C). Weather in May »

The first month of the summer, June, is a pleasant month in Great Falls, Montana, with average temperature fluctuating between 72.1°F (22.3°C) and 49.5°F (9.7°C). In June, the average high-temperature rises, from an enjoyable 63°F (17.2°C) in May, to an agreeable 72.1°F (22.3°C). Weather in June »

July is a warm summer month in Great Falls, Montana, with temperature in the range of an average high of 83.1°F (28.4°C) and an average low of 56.3°F (13.5°C). With an average high-temperature of 83.1°F (28.4°C) and an average low-temperature of 56.3°F (13.5°C), July is the warmest month. The average heat index in July is appraised at 82.9°F (28.3°C). Weather in July »

The last month of the summer, August, is also a moderately hot month in Great Falls, Montana, with temperature in the range of an average high of 81.9°F (27.7°C) and an average low of 57.7°F (14.3°C). In August, the average high-temperature is practically the same as in July - a still warm 81.9°F (27.7°C). Weather in August »

September, the first month of the autumn, in Great Falls, is also an agreeable month, with average temperature ranging between max 71.2°F (21.8°C) and min 50.5°F (10.3°C). In Great Falls, the average high-temperature in September drops, from a warm 81.9°F (27.7°C) in August, to a pleasant 71.2°F (21.8°C). Weather in September »

October, the same as September, is a cool autumn month in Great Falls, Montana, with temperature in the range of an average high of 54.5°F (12.5°C) and an average low of 37.8°F (3.2°C). In October, the average high-temperature significantly decreases, from an agreeable 71.2°F (21.8°C) in September, to a cool 54.5°F (12.5°C). Weather in October »

November, the last month of the autumn, in Great Falls, is another cold month, with temperature in the range of an average low of 27.3°F (-2.6°C) and an average high of 40.8°F (4.9°C). In November, the average high-temperature decreases, from a cool 54.5°F (12.5°C) in October, to a wintry 40.8°F (4.9°C). Weather in November »

The first month of the winter, December, is still a freezing cold month in Great Falls, Montana, with average temperature ranging between max 30°F (-1.1°C) and min 18.3°F (-7.6°C). The coldest month is December, with an average high-temperature of 30°F (-1.1°C) and an average low-temperature of 18.3°F (-7.6°C). Weather in December »

What is the most humid month in Great Falls?

With an average relative humidity of 77%, January is the most humid month.

How much does it rain in Great Falls?

In Great Falls, Montana, during the entire year, the rain falls for 68.2 days and collects up to 4.49" (114mm) of precipitation.

When does it snow in Great Falls?

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

How many days does it snow in Great Falls?

In Great Falls, during the entire year, snow falls for 45.4 days, and aggregates up to 11.61" (295mm) of snow.

What is the month with the least sunshine in Great Falls?

January, February and December, with an average of 5.5h of sunshine, are months with the least sunshine.

What are the months with the lowest UV index in Great Falls?

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index.

When does it snow the most in Great Falls?

The month with the most snowfall in Great Falls, Montana, is February when snow falls for 10 days and typically aggregates up to 2.09" (53mm) of snow.

What is the wettest month in Great Falls?

June is the month with the most rainfall in Great Falls, Montana. Rain falls for 8.6 days and accumulates 0.87" (22mm) of precipitation.

When it does not snow in Great Falls?

June through August are months without snowfall in Great Falls.

When are the longest days in Great Falls?

The month with the longest days is June, with an average of 15.9h of daylight.

What is the warmest month in Great Falls?

July is the warmest month in Great Falls, Montana, with an average high-temperature of 83.1°F (28.4°C) and an average low-temperature of 56.3°F (13.5°C).

What month has the most sunshine in Great Falls?

July has the most sunshine of the year in Great Falls, Montana, with an average of 12.1h of sunshine.

What is the month with the highest UV index in Great Falls?

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

What is the least humid month in Great Falls?

August is the least humid month, with an average relative humidity of 40%.

What is the coldest month in Great Falls?

December is the coldest month, with an average high-temperature of 30°F (-1.1°C) and an average low-temperature of 18.3°F (-7.6°C).

What is the driest month in Great Falls?

The month with the least rainfall in Great Falls is December when the rain falls for 2.7 days and typically collects 0.16" (4mm) of precipitation.

What is the month with the shortest days in Great Falls?

With an average of 8.5h of daylight, December has the shortest days of the year.
Average temperature - Great Falls, MT
Average rainfall - Great Falls, MT
Average rainfall days - Great Falls, MT
Average snowfall - Great Falls, MT
Average snowfall days - Great Falls, MT

The month with the highest number of snowfall days is February (10 days).
Months with the least snowfall days are June, July and August (0 days).

Average daylight / Average sunshine - Great Falls, MT

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

The month with the most sunshine is July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 5.5).

Average UV index - Great Falls, MT