Climate and monthly weather forecast
Garrison, MT

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Weather in January

January, like December, is a freezing cold winter month in Garrison, Montana, with an average temperature fluctuating between 14.4°F (-9.8°C) and 28°F (-2.2°C). Garrison notes an average high-temperature of a still freezing cold 28°F (-2.2°C) in January, hardly diverging from December. Weather in January »

Weather in February

February, the last month of the winter in Garrison, is another freezing cold month, with temperature in the range of an average high of 27.5°F (-2.5°C) and an average low of 12.7°F (-10.7°C). Garrison's weather in February indicates an average high-temperature of a still subzero cold 27.5°F (-2.5°C), nearly consistent with the 28°F (-2.2°C) of January. Weather in February »

Weather in March

The first month of the spring, March, is a wintry month in Garrison, Montana, with an average temperature ranging between min 19.8°F (-6.8°C) and max 35.4°F (1.9°C). The shift from February to March sees a slight increase in the average high-temperature, transitioning from a freezing cold 27.5°F (-2.5°C) to a cold 35.4°F (1.9°C). Weather in March »

Weather in April

April in Garrison, Montana, is a chilly spring month, with an average temperature fluctuating between 43.9°F (6.6°C) and 26.1°F (-3.3°C). As Garrison, Montana, welcomes April, the average high-temperature sees a modest rise, transitioning from a cold 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 moderate month, with an average temperature ranging between max 55.6°F (13.1°C) and min 33.6°F (0.9°C). May shows a rise in the average high-temperature, moving from April's chilly 43.9°F (6.6°C) to a mild 55.6°F (13.1°C). Weather in May »

Weather in June

The first month of the summer, June, is an enjoyable month in Garrison, Montana, with an average temperature ranging between max 65.5°F (18.6°C) and min 40.3°F (4.6°C). June witnesses an increase in the average high-temperature, moving from a moderate 55.6°F (13.1°C) in May to a still refreshing 65.5°F (18.6°C). Weather in June »

Weather in July

July in Garrison, Montana, is a warm summer month, with an average temperature varying between 46.9°F (8.3°C) and 76.8°F (24.9°C). With average high and low temperatures of 76.8°F (24.9°C) and 46.9°F (8.3°C) respectively, July is Garrison's warmest month. Weather in July »

Weather in August

August, the last month of the summer in Garrison, is also a moderately hot month, with an average temperature ranging between min 47.3°F (8.5°C) and max 75.2°F (24°C). Garrison sees the arrival of August with an average high-temperature of a still moderately hot 75.2°F (24°C), indicating a subtle variation from July. Weather in August »

Weather in September

September, the first month of the autumn in Garrison, is also an enjoyable month, with an average temperature varying between 41.2°F (5.1°C) and 65.7°F (18.7°C). The onset of September comes with a shift in the average high-temperature, falling from a warm 75.2°F (24°C) in August to a refreshing 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 an average temperature varying between 29.8°F (-1.2°C) and 48.6°F (9.2°C). As Garrison steps into October, the average high-temperature decreases significantly from the a refreshing 65.7°F (18.7°C) of September to a chilly 48.6°F (9.2°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cold month in Garrison, Montana, with an average temperature varying between 35.2°F (1.8°C) and 19.8°F (-6.8°C). The beginning of November involves a decrease in the average high-temperature, transitioning from a frosty 48.6°F (9.2°C) in October to an icy 35.2°F (1.8°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Garrison, Montana, with an average temperature fluctuating between 25.7°F (-3.5°C) and 12.6°F (-10.8°C). December is the coldest month, 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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Frequently asked questions

What is the most humid month in Garrison?

The months with the highest humidity are January and February, with an average relative humidity of 88%.

How much does it rain in Garrison?

Throughout the year, in Garrison, 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, Montana, are January through June, September through December.

How many days does it snow in Garrison?

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

What is the month with the least sunshine in Garrison?

The month with the least sunshine is January, with an average of 5.6h of sunshine.

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

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

What is the snowiest month in Garrison?

The month with the most snowfall in Garrison, Montana, is February, when snow falls for 20.3 days and typically aggregates up to 12.76" (324mm) of snow.

When is Daylight Saving Time (DST) in Garrison?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Garrison, Montana, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.

What is the wettest month in Garrison?

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

When are the longest days in Garrison?

With an average of 15h and 48min of daylight, June has the longest days of the year.

What month is the hottest in Garrison?

In Garrison, July records the average highest temperatures, peaking at 76.8°F (24.9°C) and reaching a low of 46.9°F (8.3°C).

What are the least humid months in Garrison?

The months with the lowest humidity 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?

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

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?

The month with the least rainfall in Garrison is August, when the rain falls for 7.3 days and typically collects 0.67" (17mm) of precipitation.

What are the coldest months in Garrison?

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

What is the month with the shortest days in Garrison?

With an average of 8h and 36min of daylight, December has the shortest days of the year in Garrison.

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

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

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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

The months with the highest relative humidity are January and February (88%).
The 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").
The 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).
The 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: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).

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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).
The 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

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

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Garrison, Montana, USA

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