Monthly weather forecast and climate
Sweet Grass, MT

Weather in January

January, the same as December, in Sweet Grass, Montana, is a freezing cold winter month, with average temperature varying between 28.9°F (-1.7°C) and 16.2°F (-8.8°C). In Sweet Grass, the average high-temperature in January is relatively the same as in December - a still freezing cold 28.9°F (-1.7°C). Weather in January »

Weather in February

February, the last month of the winter, in Sweet Grass, is another freezing cold month, with average temperature varying between 15.6°F (-9.1°C) and 28.8°F (-1.8°C). In February, the average high-temperature is practically the same as in January - a still subzero cold 28.8°F (-1.8°C). Weather in February »

Weather in March

March, the first month of the spring, in Sweet Grass, is a cold month, with temperature in the range of an average high of 39°F (3.9°C) and an average low of 24.8°F (-4°C). In Sweet Grass, the average high-temperature in March rises, from a freezing cold 28.8°F (-1.8°C) in February, to a wintry 39°F (3.9°C). Weather in March »

Weather in April

April is a chilly spring month in Sweet Grass, Montana, with temperature in the range of an average low of 34°F (1.1°C) and an average high of 49.6°F (9.8°C). In Sweet Grass, the average high-temperature rises, from a wintry 39°F (3.9°C) in March, to a chilly 49.6°F (9.8°C). Weather in April »

Weather in May

May, the last month of the spring, in Sweet Grass, is a mild month, with temperature in the range of an average high of 60.3°F (15.7°C) and an average low of 42.4°F (5.8°C). In Sweet Grass, Montana, the average high-temperature increases, from a chilly 49.6°F (9.8°C) in April, to a mild 60.3°F (15.7°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Sweet Grass, Montana, with average temperature ranging between min 48.7°F (9.3°C) and max 69.1°F (20.6°C). In June, the average high-temperature marginally rises, from a mild 60.3°F (15.7°C) in May, to a pleasant 69.1°F (20.6°C). Weather in June »

Weather in July

July is a warm summer month in Sweet Grass, Montana, with average temperature ranging between max 78.8°F (26°C) and min 54.5°F (12.5°C). The warmest month is July, with an average high-temperature of 78.8°F (26°C) and an average low-temperature of 54.5°F (12.5°C). Weather in July »

Weather in August

August, the last month of the summer, in Sweet Grass, is another warm month, with temperature in the range of an average high of 78.1°F (25.6°C) and an average low of 55.2°F (12.9°C). In August, the average high-temperature is essentially the same as in July - a still warm 78.1°F (25.6°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a comfortable month in Sweet Grass, Montana, with average temperature fluctuating between 48.4°F (9.1°C) and 67.6°F (19.8°C). In September, the average high-temperature decreases, from a moderately hot 78.1°F (25.6°C) in August, to an enjoyable 67.6°F (19.8°C). Weather in September »

Weather in October

October, like September, in Sweet Grass, Montana, is another fresh autumn month, with average temperature ranging between min 36.1°F (2.3°C) and max 51.4°F (10.8°C). In October, the average high-temperature significantly decreases, from a comfortable 67.6°F (19.8°C) in September, to a fresh 51.4°F (10.8°C). Weather in October »

Weather in November

November, the last month of the autumn, in Sweet Grass, is another cold month, with average temperature ranging between max 38.1°F (3.4°C) and min 24.4°F (-4.2°C). In Sweet Grass, the average high-temperature in November drops, from a fresh 51.4°F (10.8°C) in October, to a wintry 38.1°F (3.4°C). Weather in November »

Weather in December

December, the first month of the winter, in Sweet Grass, is still a freezing cold month, with average temperature fluctuating between 15.3°F (-9.3°C) and 27.1°F (-2.7°C). With an average high-temperature of 27.1°F (-2.7°C) and an average low-temperature of 15.3°F (-9.3°C), December is the coldest month. Weather in December »
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FAQ

What is the most humid month in Sweet Grass?

The most humid month in Sweet Grass, Montana, is January, with an average relative humidity of 79%.

How much does it rain in Sweet Grass?

Throughout the year, there are 70.4 rainfall days, and 8.46" (215mm) of precipitation is accumulated.

When does it snow in Sweet Grass?

Months with snowfall in Sweet Grass, Montana, are January through May, September through December.

How many days does it snow in Sweet Grass?

In Sweet Grass, Montana, during the entire year, snow falls for 54.3 days, and aggregates up to 19.49" (495mm) of snow.

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

Months with the least sunshine in Sweet Grass are January and December, with an average of 5.6h of sunshine.

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

Months with the lowest UV index in Sweet Grass, Montana, are January through March, October through December, with an average maximum UV index of 2.

When does it snow the most in Sweet Grass?

February is the month with the most snowfall in Sweet Grass, Montana. Snow falls for 9.7 days and accumulates 3.58" (91mm) of snow.

What is the rainiest month in Sweet Grass?

The month with the most rainfall is June when the rain falls for 9.3 days and typically aggregates up to 1.77" (45mm) of precipitation.

When it does not snow in Sweet Grass?

June through August are months without snowfall.

When are the longest days in Sweet Grass?

June has the longest days of the year in Sweet Grass, with an average of 16.1h of daylight.

What is the warmest month in Sweet Grass?

The warmest month is July, with an average high-temperature of 78.8°F (26°C) and an average low-temperature of 54.5°F (12.5°C).

What is the driest month in Sweet Grass?

The month with the least rainfall in Sweet Grass is July when the rain falls for 5.8 days and typically collects 0.31" (8mm) of precipitation.

What month has the most sunshine in Sweet Grass?

The month with the most sunshine in Sweet Grass is July, with an average of 12h of sunshine.

What is the month with the highest UV index in Sweet Grass?

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

What is the least humid month in Sweet Grass?

The least humid month in Sweet Grass is August, with an average relative humidity of 43%.

What is the coldest month in Sweet Grass?

With an average high-temperature of 27.1°F (-2.7°C) and an average low-temperature of 15.3°F (-9.3°C), December is the coldest month.

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

With an average of 8.3h of daylight, December has the shortest days of the year in Sweet Grass, Montana.

Average temperature
Sweet Grass, MT

Average temperature - Sweet Grass, MT

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (27.1°F).

The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (15.3°F).

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Average pressure
Sweet Grass, MT

Average pressure - Sweet Grass, MT

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed
Sweet Grass, MT

Average wind speed - Sweet Grass, MT

The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.8mph).

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Average rainfall
Sweet Grass, MT

Average rainfall - Sweet Grass, MT

The wettest month (with the highest rainfall) is June (1.77").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days
Sweet Grass, MT

Average rainfall days - Sweet Grass, MT

The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is November (2.6 days).

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Average snowfall
Sweet Grass, MT

Average snowfall - Sweet Grass, MT

The month with the highest snowfall is February (3.58").
Months with the least snowfall are June, July and August (0").

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Average snowfall days
Sweet Grass, MT

Average snowfall days - Sweet Grass, MT

The month with the highest number of snowfall days is December (10.2 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight / Average sunshine
Sweet Grass, MT

Average daylight / Average sunshine - Sweet Grass, MT

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

The month with the most sunshine is July (Average sunshine: 12h).
Months with the least sunshine are January and December (Average sunshine: 5.6).

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Average sunshine days
Sweet Grass, MT

Average sunshine days - Sweet Grass, MT

The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is April (17.4 days).

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Average UV index
Sweet Grass, MT

Average UV index - Sweet Grass, MT

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

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Average visibility
Sweet Grass, MT

Average visibility - Sweet Grass, 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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