Climate and monthly weather forecast
Big Sky, MT

Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana
Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana

Weather in January

January, like December, is another subzero cold winter month in Big Sky, Montana, with an average temperature ranging between min 9.9°F (-12.3°C) and max 25°F (-3.9°C). In Big Sky, the average high-temperature in January is practically the same as in December - a still freezing cold 25°F (-3.9°C). Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Big Sky, Montana, with an average temperature fluctuating between 9.5°F (-12.5°C) and 25.2°F (-3.8°C). In February, the average high-temperature is practically the same as in January - a still subzero cold 25.2°F (-3.8°C). Weather in February »

Weather in March

March, the first month of the spring in Big Sky, is a cold month, with an average temperature fluctuating between 32.9°F (0.5°C) and 17.6°F (-8°C). In Big Sky, Montana, the average high-temperature in March slightly increases from a freezing cold 25.2°F (-3.8°C) in February to a wintry 32.9°F (0.5°C). Weather in March »

Weather in April

April, like March, in Big Sky, Montana, is a wintry spring month, with an average temperature fluctuating between 22.1°F (-5.5°C) and 40.1°F (4.5°C). In April, the average high-temperature marginally rises from a wintry 32.9°F (0.5°C) in March to a still cold 40.1°F (4.5°C). Weather in April »

Weather in May

The last month of the spring, May, is a fresh month in Big Sky, Montana, with temperature in the range of an average low of 30.6°F (-0.8°C) and an average high of 52°F (11.1°C). In May, the average high-temperature rises from a wintry 40.1°F (4.5°C) in April to a cool 52°F (11.1°C). Weather in May »

Weather in June

The first month of the summer, June, is an enjoyable month in Big Sky, Montana, with an average temperature varying between 38.5°F (3.6°C) and 64°F (17.8°C). In Big Sky, the average high-temperature in June increases from a fresh 52°F (11.1°C) in May to a comfortable 64°F (17.8°C). Weather in June »

Weather in July

July in Big Sky, Montana, is a warm summer month, with an average temperature fluctuating between 44.6°F (7°C) and 74.8°F (23.8°C). The warmest month is July, with an average high-temperature of 74.8°F (23.8°C) and an average low-temperature of 44.6°F (7°C). Weather in July »

Weather in August

The last month of the summer, August, is also an agreeable month in Big Sky, Montana, with an average temperature varying between 45.1°F (7.3°C) and 72.7°F (22.6°C). In August, the average high-temperature is essentially the same as in July - an agreeable 72.7°F (22.6°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an enjoyable month in Big Sky, Montana, with an average temperature fluctuating between 63.5°F (17.5°C) and 39.6°F (4.2°C). In Big Sky, the average high-temperature in September decreases from a pleasant 72.7°F (22.6°C) in August to a comfortable 63.5°F (17.5°C). Weather in September »

Weather in October

October, like September, is another chilly autumn month in Big Sky, Montana, with an average temperature varying between 27.5°F (-2.5°C) and 45.5°F (7.5°C). In Big Sky, Montana, the average high-temperature in October significantly decreases from a comfortable 63.5°F (17.5°C) in September to a frosty 45.5°F (7.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Big Sky, is another cold month, with temperature in the range of an average high of 32.2°F (0.1°C) and an average low of 16.9°F (-8.4°C). In Big Sky, the average high-temperature in November decreases from a frosty 45.5°F (7.5°C) in October to a cold 32.2°F (0.1°C). Weather in November »

Weather in December

December, the first month of the winter in Big Sky, is still a freezing cold month, with an average temperature varying between 22.5°F (-5.3°C) and 7.9°F (-13.4°C). December is the coldest month, with an average high-temperature of 22.5°F (-5.3°C) and an average low-temperature of 7.9°F (-13.4°C). Weather in December »
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FAQ

What is the most humid month in Big Sky?

January and February, with an average relative humidity of 90%, are most humid months in Big Sky.

How many days does it rain in Big Sky?

Throughout the year, there are 116.1 rainfall days, and 23.5" (597mm) of precipitation is accumulated.

When does it snow in Big Sky?

January through December are months with snowfall.

How many days does it snow in Big Sky?

Throughout the year, in Big Sky, there are 151.6 snowfall days, and 124.06" (3151mm) of snow is accumulated.

What is the month with the least sunshine in Big Sky?

The month with the least sunshine is January, with an average of 4.7h of sunshine.

What is the month with the lowest UV index in Big Sky?

The months with the lowest UV index in Big Sky, Montana, are January and February, with an average maximum UV index of 1.

When is Daylight Saving Time (DST) in Big Sky?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from MDT to MST.

What is the rainiest month in Big Sky?

The months with the most rainfall are April and May, with an average 2.91" (74mm) of precipitation.

When does it snow the most in Big Sky?

April is the month with the most snowfall in Big Sky. Snow falls for 20.5 days and accumulates 19.88" (505mm) of snow.

When are the longest days in Big Sky?

June has the longest days of the year in Big Sky, Montana, with an average of 15h and 35min of daylight.

What is the warmest month in Big Sky?

With an average high-temperature of 74.8°F (23.8°C) and an average low-temperature of 44.6°F (7°C), July is the warmest month.

What is the driest month in Big Sky?

July is the month with the least rainfall in Big Sky. Rain falls for 12.5 days and accumulates 1.18" (30mm) of precipitation.

What month has the most sunshine in Big Sky?

July has the most sunshine of the year in Big Sky, Montana, with an average of 11.7h of sunshine.

When is the highest UV index in Big Sky?

With an average maximum UV index of 5, July is the month with the highest UV index.

What is the least humid month in Big Sky?

August is the least humid month in Big Sky, Montana, with an average relative humidity of 51%.

When it does not snow in Big Sky?

The month with the least snowfall is August, when snow falls for 0.3 days and typically aggregates up to 0.08" (2mm) of snow.

What is the coldest month in Big Sky?

December is the coldest month in Big Sky, with an average high-temperature of 22.5°F (-5.3°C) and an average low-temperature of 7.9°F (-13.4°C).

What is the month with the shortest days in Big Sky?

December has the shortest days of the year in Big Sky, Montana, with an average of 8h and 49min of daylight.

Average temperature
Big Sky, MT

Average temperature - Big Sky, MT

The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is December (22.5°F).

The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (7.9°F).

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Average pressure
Big Sky, MT

Average pressure - Big Sky, MT

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed
Big Sky, MT

Average wind speed - Big Sky, MT

The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity
Big Sky, MT

Average humidity - Big Sky, MT

The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is August (51%).

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Average rainfall
Big Sky, MT

Average rainfall - Big Sky, MT

The wettest months (with the highest rainfall) are April and May (2.91").
The driest month (with the least rainfall) is July (1.18").

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Average rainfall days
Big Sky, MT

Average rainfall days - Big Sky, MT

The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is February (4.3 days).

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Average snowfall
Big Sky, MT

Average snowfall - Big Sky, MT

The month with the highest snowfall is April (19.88").
The month with the least snowfall is August (0.08").

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Average snowfall days
Big Sky, MT

Average snowfall days - Big Sky, MT

The month with the highest number of snowfall days is March (21 days).
The month with the least snowfall days is August (0.3 days).

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Average daylight / Average sunshine
Big Sky, MT

Average daylight / Average sunshine - Big Sky, MT

The month with the longest days is June (Average daylight: 15h and 35min).
The month with the shortest days is December (Average daylight: 8h and 49min).

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

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Average sunshine days
Big Sky, MT

Average sunshine days - Big Sky, MT

The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is May (5.7 days).

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Average visibility
Big Sky, MT

Average visibility - Big Sky, MT

The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).

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