Monthly weather forecast and climate
Grass Range, MT

Weather in January

January, like December, is a freezing cold winter month in Grass Range, Montana, with average temperature fluctuating between 30.6°F (-0.8°C) and 16.9°F (-8.4°C). In Grass Range, the average high-temperature in January is practically the same as in December - a still subzero cold 30.6°F (-0.8°C). Weather in January »

Weather in February

The last month of the winter, February, is another freezing cold month in Grass Range, Montana, with average temperature varying between 29.1°F (-1.6°C) and 15.3°F (-9.3°C). February and December, with an average high-temperature of 29.1°F (-1.6°C), are the coldest months. Weather in February »

Weather in March

March, the first month of the spring, in Grass Range, is a wintry month, with average temperature ranging between max 40.6°F (4.8°C) and min 25.3°F (-3.7°C). In March, the average high-temperature increases, from a freezing cold 29.1°F (-1.6°C) in February, to a wintry 40.6°F (4.8°C). Weather in March »

Weather in April

April is a frosty spring month in Grass Range, Montana, with average temperature ranging between max 47.8°F (8.8°C) and min 31.8°F (-0.1°C). In April, the average high-temperature marginally rises, from a wintry 40.6°F (4.8°C) in March, to a chilly 47.8°F (8.8°C). Weather in April »

Weather in May

The last month of the spring, May, is a mild month in Grass Range, Montana, with average temperature ranging between min 40.1°F (4.5°C) and max 58.5°F (14.7°C). In Grass Range, Montana, the average high-temperature in May increases, from a chilly 47.8°F (8.8°C) in April, to a moderate 58.5°F (14.7°C). Weather in May »

Weather in June

June, the first month of the summer, in Grass Range, is a pleasant month, with average temperature varying between 47.8°F (8.8°C) and 68.5°F (20.3°C). In June, the average high-temperature rises, from a mild 58.5°F (14.7°C) in May, to an agreeable 68.5°F (20.3°C). Weather in June »

Weather in July

July in Grass Range, Montana, is a warm summer month, with average temperature varying between 54.3°F (12.4°C) and 78.8°F (26°C). The warmest month is July, with an average high-temperature of 78.8°F (26°C) and an average low-temperature of 54.3°F (12.4°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Grass Range, Montana, with average temperature varying between 54.5°F (12.5°C) and 78.1°F (25.6°C). In Grass Range, the average high-temperature is essentially the same as in July - a still moderately hot 78.1°F (25.6°C). Weather in August »

Weather in September

September, the first month of the autumn, in Grass Range, is still a comfortable month, with average temperature varying between 67.5°F (19.7°C) and 47.1°F (8.4°C). In Grass Range, the average high-temperature in September drops, from a warm 78.1°F (25.6°C) in August, to an enjoyable 67.5°F (19.7°C). Weather in September »

Weather in October

October, the same as September, is another fresh autumn month in Grass Range, Montana, with temperature in the range of an average low of 35.1°F (1.7°C) and an average high of 52.2°F (11.2°C). In October, the average high-temperature plummets, from a comfortable 67.5°F (19.7°C) in September, to a cool 52.2°F (11.2°C). Weather in October »

Weather in November

November, the last month of the autumn, in Grass Range, is another cold month, with temperature in the range of an average low of 25.2°F (-3.8°C) and an average high of 39.2°F (4°C). In Grass Range, Montana, the average high-temperature decreases, from a fresh 52.2°F (11.2°C) in October, to a cold 39.2°F (4°C). Weather in November »

Weather in December

December, the first month of the winter, in Grass Range, is still a freezing cold month, with temperature in the range of an average low of 16°F (-8.9°C) and an average high of 29.1°F (-1.6°C). February and December, with an average high-temperature of 29.1°F (-1.6°C), are the coldest months. Weather in December »
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FAQ

How many days does it rain in Grass Range?

Throughout the year, there are 126.2 rainfall days, and 17.83" (453mm) of precipitation is accumulated.

When does it snow in Grass Range?

Months with snowfall in Grass Range, Montana, are January through June, September through December.

How many days does it snow in Grass Range?

In Grass Range, Montana, during the entire year, snow falls for 83.4 days, and aggregates up to 45.51" (1156mm) of snow.

What is the month with the lowest UV index in Grass Range?

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

What is the coldest month in Grass Range?

The coldest months in Grass Range, Montana, are February and December, with an average high-temperature of 29.1°F (-1.6°C).

What is the most humid month in Grass Range?

February is the most humid month in Grass Range, Montana, with an average relative humidity of 79%.

What is the month with the least sunshine in Grass Range?

With an average of 5.5h of sunshine, February has the least sunshine of the year in Grass Range, Montana.

What is the snowiest month in Grass Range?

April is the month with the most snowfall in Grass Range, Montana. Snow falls for 10 days and accumulates 9.13" (232mm) of snow.

What is the wettest month in Grass Range?

May is the month with the most rainfall. Rain falls for 19.3 days and accumulates 3.39" (86mm) of precipitation.

When are the longest days in Grass Range?

June has the longest days of the year in Grass Range, with an average of 15.8h of daylight.

What is the warmest month in Grass Range?

With an average high-temperature of 78.8°F (26°C) and an average low-temperature of 54.3°F (12.4°C), July is the warmest month.

When it does not snow in Grass Range?

In Grass Range, Montana, snow does not fall in July and August.

What month has the most sunshine in Grass Range?

The month with the most sunshine is July, with an average of 11.8h of sunshine.

When is the highest UV index in Grass Range?

July is the month with the highest UV index in Grass Range, with an average maximum UV index of 6.

What is the least humid month in Grass Range?

The least humid month is August, with an average relative humidity of 47%.

What is the driest month in Grass Range?

December is the month with the least rainfall. Rain falls for 6 days and accumulates 0.71" (18mm) of precipitation.

What is the month with the shortest days in Grass Range?

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

Average temperature
Grass Range, MT

Average temperature - Grass Range, MT

The warmest month (with the highest average high temperature) is July (78.8°F).
Months with the lowest average high temperature are February and December (29.1°F).

The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).

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Average pressure
Grass Range, MT

Average pressure - Grass Range, MT

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.85").

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Average wind speed
Grass Range, MT

Average wind speed - Grass Range, MT

The windiest months (with the highest average wind speed) are January, April and October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).

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Average humidity
Grass Range, MT

Average humidity - Grass Range, MT

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).

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Average rainfall
Grass Range, MT

Average rainfall - Grass Range, MT

The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (0.71").

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Average rainfall days
Grass Range, MT

Average rainfall days - Grass Range, MT

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (5.4 days).

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Average snowfall
Grass Range, MT

Average snowfall - Grass Range, MT

The month with the highest snowfall is April (9.13").
Months with the least snowfall are July and August (0").

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Average snowfall days
Grass Range, MT

Average snowfall days - Grass Range, MT

The month with the highest number of snowfall days is February (15.2 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight / Average sunshine
Grass Range, MT

Average daylight / Average sunshine - Grass Range, 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: 11.8h).
The month with the least sunshine is February (Average sunshine: 5.5h).

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Average sunshine days
Grass Range, MT

Average sunshine days - Grass Range, MT

The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (8.3 days).

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Average UV index
Grass Range, MT

Average UV index - Grass Range, MT

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average visibility
Grass Range, MT

Average visibility - Grass Range, MT

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

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