Monthly weather forecast and climate
Grantsdale, MT

January, like December, is another subzero cold winter month in Grantsdale, Montana, with temperature in the range of an average low of 16.2°F (-8.8°C) and an average high of 28.8°F (-1.8°C). In Grantsdale, Montana, the average high-temperature is relatively the same as in December - a still subzero cold 28.8°F (-1.8°C). Weather in January »

The last month of the winter, February, is another freezing cold month in Grantsdale, Montana, with average temperature varying between 28.8°F (-1.8°C) and 15.1°F (-9.4°C). In February, the average high-temperature remains equal as in January - a still subzero cold 28.8°F (-1.8°C). Weather in February »

March, the first month of the spring, in Grantsdale, is a cold month, with average temperature varying between 36°F (2.2°C) and 21°F (-6.1°C). In Grantsdale, the average high-temperature in March marginally rises, from a freezing cold 28.8°F (-1.8°C) in February, to a cold 36°F (2.2°C). Weather in March »

April in Grantsdale, Montana, is a chilly spring month, with average temperature varying between 25.9°F (-3.4°C) and 43.5°F (6.4°C). In April, the average high-temperature slightly increases, from a cold 36°F (2.2°C) in March, to a frosty 43.5°F (6.4°C). Weather in April »

May, the last month of the spring, in Grantsdale, is a mild month, with average temperature fluctuating between 56.7°F (13.7°C) and 33.4°F (0.8°C). In May, the average high-temperature increases, from a chilly 43.5°F (6.4°C) in April, to a moderate 56.7°F (13.7°C). Weather in May »

June, the first month of the summer, in Grantsdale, is an enjoyable month, with average temperature ranging between max 65.3°F (18.5°C) and min 40.6°F (4.8°C). In Grantsdale, the average high-temperature slightly increases, from a moderate 56.7°F (13.7°C) in May, to a comfortable 65.3°F (18.5°C). Weather in June »

July in Grantsdale, Montana, is a moderately hot summer month, with temperature in the range of an average high of 77°F (25°C) and an average low of 46.8°F (8.2°C). July is the warmest month, with an average high-temperature of 77°F (25°C) and an average low-temperature of 46.8°F (8.2°C). Weather in July »

The last month of the summer, August, is also a moderately hot month in Grantsdale, Montana, with average temperature fluctuating between 46.9°F (8.3°C) and 76.3°F (24.6°C). In August, the average high-temperature is almost the same as in July - a still warm 76.3°F (24.6°C). Weather in August »

The first month of the autumn, September, is also an enjoyable month in Grantsdale, Montana, with average temperature ranging between max 66.2°F (19°C) and min 39.9°F (4.4°C). In September, the average high-temperature decreases, from a moderately hot 76.3°F (24.6°C) in August, to a comfortable 66.2°F (19°C). Weather in September »

October, like September, in Grantsdale, Montana, is another fresh autumn month, with average temperature ranging between min 30.4°F (-0.9°C) and max 50°F (10°C). In Grantsdale, the average high-temperature in October plummets, from a comfortable 66.2°F (19°C) in September, to a fresh 50°F (10°C). Weather in October »

November, the last month of the autumn, in Grantsdale, is another cold month, with average temperature fluctuating between 36.1°F (2.3°C) and 21.9°F (-5.6°C). In November, the average high-temperature decreases, from a fresh 50°F (10°C) in October, to a cold 36.1°F (2.3°C). Weather in November »

December, the first month of the winter, in Grantsdale, is still a freezing cold month, with average temperature fluctuating between 26.8°F (-2.9°C) and 14°F (-10°C). With an average high-temperature of 26.8°F (-2.9°C) and an average low-temperature of 14°F (-10°C), December is the coldest month. Weather in December »

What is the most humid month in Grantsdale?

With an average relative humidity of 89%, January is the most humid month.

How much does it rain in Grantsdale?

Throughout the year, there are 163.6 rainfall days, and 20.83" (529mm) of precipitation is accumulated.

When does it snow in Grantsdale?

January through May, September through December are months with snowfall in Grantsdale, Montana.

How much does it snow in Grantsdale?

In Grantsdale, during the entire year, snow falls for 101.1 days, and aggregates up to 59.17" (1503mm) of snow.

What is the month with the least sunshine in Grantsdale?

January and December, with an average of 5.4h of sunshine, are months with the least sunshine in Grantsdale.

What is the rainiest month in Grantsdale?

The wettest months in Grantsdale, Montana, are February and April, with an average 2.36" (60mm) of rainfall.

When does it snow the most in Grantsdale?

The month with the most snowfall is February when snow falls for 19.3 days and typically aggregates up to 13.03" (331mm) of snow.

What are the months with the lowest UV index in Grantsdale?

Months with the lowest UV index are February and December, with an average maximum UV index of 1.

When it does not snow in Grantsdale?

June through August are months without snowfall in Grantsdale, Montana.

When are the longest days in Grantsdale?

June has the longest days of the year in Grantsdale, with an average of 15.7h of daylight.

What is the warmest month in Grantsdale?

With an average high-temperature of 77°F (25°C) and an average low-temperature of 46.8°F (8.2°C), July is the warmest month in Grantsdale, Montana.

What are the months with the most sunshine in Grantsdale?

Months with the most sunshine are July and August, with an average of 11.7h of sunshine.

When is the highest UV index in Grantsdale?

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

What is the least humid month in Grantsdale?

August is the least humid month in Grantsdale, with an average relative humidity of 50%.

What is the driest month in Grantsdale?

August is the month with the least rainfall. Rain falls for 8.7 days and accumulates 0.75" (19mm) of precipitation.

What is the coldest month in Grantsdale?

The coldest month in Grantsdale, Montana, is December, with an average high-temperature of 26.8°F (-2.9°C) and an average low-temperature of 14°F (-10°C).

What is the month with the shortest days in Grantsdale?

December has the shortest days of the year, with an average of 8.7h of daylight.
Average temperature - Grantsdale, MT
Average pressure - Grantsdale, MT

The month with the highest atmospheric pressure is January (30.21").
The month with the lowest atmospheric pressure is June (29.93").

Average wind speed - Grantsdale, MT

The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

Average rainfall - Grantsdale, MT

The wettest months (with the highest rainfall) are February and April (2.36").
The driest month (with the least rainfall) is August (0.75").

Average rainfall days - Grantsdale, MT
Average snowfall - Grantsdale, MT
Average snowfall days - Grantsdale, MT

The month with the highest number of snowfall days is February (19.3 days).
Months with the least snowfall days are June, July and August (0 days).

Average daylight / Average sunshine - Grantsdale, MT

The month with the longest days is June (Average daylight: 15.7h).
The month with the shortest days is December (Average daylight: 8.7h).

Months with the most sunshine are July and August (Average sunshine: 11.7h).
Months with the least sunshine are January and December (Average sunshine: 5.4).

Average sunshine days - Grantsdale, MT
Average visibility - Grantsdale, 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).