Monthly weather forecast and climate
Garrison, MT

Weather in January

January, the same as December, in Garrison, Montana, is a freezing cold winter month, with average temperature fluctuating between 14.4°F (-9.8°C) and 28°F (-2.2°C). In January, the average high-temperature is practically the same as in December - a still subzero cold 28°F (-2.2°C). Weather in January »

Weather in February

February, the last month of the winter, in Garrison, is also a subzero cold month, with average temperature fluctuating between 12.7°F (-10.7°C) and 27.5°F (-2.5°C). In February, the average high-temperature is relatively the same as in January - a still freezing cold 27.5°F (-2.5°C). Weather in February »

Weather in March

March, the first month of the spring, in Garrison, is a wintry month, with average temperature varying between 35.4°F (1.9°C) and 19.8°F (-6.8°C). In Garrison, the average high-temperature in March slightly increases, from a subzero cold 27.5°F (-2.5°C) in February, to a wintry 35.4°F (1.9°C). Weather in March »

Weather in April

April is a chilly spring month in Garrison, Montana, with average temperature varying between 43.9°F (6.6°C) and 26.1°F (-3.3°C). In Garrison, Montana, the average high-temperature in April slightly increases, from a wintry 35.4°F (1.9°C) in March, to a chilly 43.9°F (6.6°C). Weather in April »

Weather in May

May, the last month of the spring, in Garrison, is a mild month, with temperature in the range of an average high of 55.6°F (13.1°C) and an average low of 33.6°F (0.9°C). In May, the average high-temperature rises, from a frosty 43.9°F (6.6°C) in April, to a mild 55.6°F (13.1°C). Weather in May »

Weather in June

June, the first month of the summer, in Garrison, is a comfortable month, with average temperature varying between 65.5°F (18.6°C) and 40.3°F (4.6°C). In Garrison, the average high-temperature in June rises, from a mild 55.6°F (13.1°C) in May, to a comfortable 65.5°F (18.6°C). Weather in June »

Weather in July

July in Garrison, Montana, is a warm summer month, with average temperature fluctuating between 76.8°F (24.9°C) and 46.9°F (8.3°C). The warmest month is July, with an average high-temperature of 76.8°F (24.9°C) and an average low-temperature of 46.9°F (8.3°C). Weather in July »

Weather in August

August, the last month of the summer, in Garrison, is also a moderately hot month, with average temperature varying between 47.3°F (8.5°C) and 75.2°F (24°C). In August, the average high-temperature is practically the same as in July - a still warm 75.2°F (24°C). Weather in August »

Weather in September

September, the first month of the autumn, in Garrison, is also an enjoyable month, with temperature in the range of an average low of 41.2°F (5.1°C) and an average high of 65.7°F (18.7°C). In Garrison, Montana, the average high-temperature in September drops, from a moderately hot 75.2°F (24°C) in August, to a comfortable 65.7°F (18.7°C). Weather in September »

Weather in October

October, the same as September, in Garrison, Montana, is another chilly autumn month, with average temperature ranging between min 29.8°F (-1.2°C) and max 48.6°F (9.2°C). In Garrison, Montana, the average high-temperature plummets, from a comfortable 65.7°F (18.7°C) in September, to a frosty 48.6°F (9.2°C). Weather in October »

Weather in November

November, the last month of the autumn, in Garrison, is also a wintry month, with average temperature varying between 35.2°F (1.8°C) and 19.8°F (-6.8°C). In November, the average high-temperature drops, from a frosty 48.6°F (9.2°C) in October, to a cold 35.2°F (1.8°C). Weather in November »

Weather in December

December, the first month of the winter, in Garrison, is also a subzero cold month, with average temperature varying between 12.6°F (-10.8°C) and 25.7°F (-3.5°C). The coldest month is December, with an average high-temperature of 25.7°F (-3.5°C) and an average low-temperature of 12.6°F (-10.8°C). Weather in December »
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FAQ

What are the most humid months in Garrison?

January and February, with an average relative humidity of 88%, are most humid months.

How many days does it rain in Garrison?

Throughout the year, there are 122.8 rainfall days, and 17.13" (435mm) of precipitation is accumulated.

When does it snow in Garrison?

Months with snowfall in Garrison are January through June, September through December.

How much does it snow in Garrison?

Throughout the year, in Garrison, there are 125.4 snowfall days, and 77.91" (1979mm) of snow is accumulated.

What is the month with the least sunshine in Garrison?

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

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

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

When does it snow the most in Garrison?

February is the month with the most snowfall. Snow falls for 20.3 days and accumulates 12.76" (324mm) of snow.

What is the wettest month in Garrison?

June is the month with the most rainfall in Garrison, Montana. Rain falls for 14.2 days and accumulates 2.52" (64mm) of precipitation.

When are the longest days in Garrison?

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

What is the warmest month in Garrison?

With an average high-temperature of 76.8°F (24.9°C) and an average low-temperature of 46.9°F (8.3°C), July is the warmest month.

What are the least humid months in Garrison?

Months with the lowest humidity in Garrison are July and August, with an average relative humidity of 49%.

When it does not snow in Garrison?

In Garrison snow does not fall in July and August.

What month has the most sunshine in Garrison?

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

When is the highest UV index in Garrison?

July is the month with the highest UV index in Garrison, Montana, with an average maximum UV index of 5.

What is the driest month in Garrison?

August is the month with the least rainfall in Garrison, Montana. Rain falls for 7.3 days and accumulates 0.67" (17mm) of precipitation.

What is the coldest month in Garrison?

With an average high-temperature of 25.7°F (-3.5°C) and an average low-temperature of 12.6°F (-10.8°C), December is the coldest month in Garrison, Montana.

What is the month with the shortest days in Garrison?

With an average of 8.6h of daylight, December has the shortest days of the year in Garrison, Montana.

Average temperature
Garrison, MT

Average temperature - Garrison, MT

The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is December (25.7°F).

The month with the highest average low temperature is August (47.3°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).

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Average pressure
Garrison, MT

Average pressure - Garrison, MT

Months with the highest atmospheric pressure are January and December (30.19").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed
Garrison, MT

Average wind speed - Garrison, MT

The windiest months (with the highest average wind speed) are January, April and November (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity
Garrison, MT

Average humidity - Garrison, MT

Months with the highest relative humidity are January and February (88%).
Months with the lowest relative humidity are July and August (49%).

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Average rainfall
Garrison, MT

Average rainfall - Garrison, MT

The wettest month (with the highest rainfall) is June (2.52").
The driest month (with the least rainfall) is August (0.67").

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Average rainfall days
Garrison, MT

Average rainfall days - Garrison, MT

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is August (7.3 days).

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Average snowfall
Garrison, MT

Average snowfall - Garrison, MT

The month with the highest snowfall is February (12.76").
Months with the least snowfall are July and August (0").

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Average snowfall days
Garrison, MT

Average snowfall days - Garrison, MT

The month with the highest number of snowfall days is February (20.3 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight / Average sunshine
Garrison, MT

Average daylight / Average sunshine - Garrison, MT

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is January (Average sunshine: 5.6h).

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Average sunshine days
Garrison, MT

Average sunshine days - Garrison, MT

The month with the most sunshine days is July (21.5 days).
The month with the least sunshine days is April (6.3 days).

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Average UV index
Garrison, MT

Average UV index - Garrison, MT

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average visibility
Garrison, MT

Average visibility - Garrison, MT

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

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