Monthly weather forecast and climate
Custer, MT

January, the same as December, in Custer, Montana, is a freezing cold winter month, with average temperature varying between 17.6°F (-8°C) and 31.1°F (-0.5°C). The coldest months are January and December, with an average high-temperature of 31.1°F (-0.5°C). Weather in January »

The last month of the winter, February, is a wintry month in Custer, Montana, with average temperature ranging between max 32°F (0°C) and min 18°F (-7.8°C). In Custer, the average high-temperature is almost the same as in January - a cold 32°F (0°C). Weather in February »

The first month of the spring, March, is a frosty month in Custer, Montana, with average temperature varying between 29.5°F (-1.4°C) and 45.5°F (7.5°C). In March, the average high-temperature rises, from a cold 32°F (0°C) in February, to a frosty 45.5°F (7.5°C). Weather in March »

April in Custer, Montana, is a cool spring month, with average temperature varying between 55.2°F (12.9°C) and 37.6°F (3.1°C). In April, the average high-temperature rises, from a chilly 45.5°F (7.5°C) in March, to a cool 55.2°F (12.9°C). Weather in April »

May, the last month of the spring, in Custer, is a comfortable month, with temperature in the range of an average high of 65.8°F (18.8°C) and an average low of 46.4°F (8°C). In May, the average high-temperature rises, from a fresh 55.2°F (12.9°C) in April, to an enjoyable 65.8°F (18.8°C). Weather in May »

June, the first month of the summer, in Custer, is a moderately hot month, with temperature in the range of an average high of 77.2°F (25.1°C) and an average low of 55.9°F (13.3°C). In Custer, the average high-temperature increases, from a comfortable 65.8°F (18.8°C) in May, to a warm 77.2°F (25.1°C). Weather in June »

July is a hot summer month in Custer, Montana, with average temperature varying between 64.2°F (17.9°C) and 86.5°F (30.3°C). The warmest month is July, with an average high-temperature of 86.5°F (30.3°C) and an average low-temperature of 64.2°F (17.9°C). In July, the average heat index is estimated at a hot 86°F (30°C). Weather in July »

The last month of the summer, August, is also a moderately hot month in Custer, Montana, with average temperature fluctuating between 63.1°F (17.3°C) and 84.7°F (29.3°C). In August, the average high-temperature is essentially the same as in July - a warm 84.7°F (29.3°C). Weather in August »

The first month of the autumn, September, is also a moderately hot month in Custer, Montana, with average temperature ranging between max 74.7°F (23.7°C) and min 54.9°F (12.7°C). In Custer, the average high-temperature in September decreases, from a warm 84.7°F (29.3°C) in August, to a still moderately hot 74.7°F (23.7°C). Weather in September »

October, like September, is a moderate autumn month in Custer, Montana, with average temperature fluctuating between 57.2°F (14°C) and 41.4°F (5.2°C). In Custer, Montana, the average high-temperature significantly decreases, from a warm 74.7°F (23.7°C) in September, to a moderate 57.2°F (14°C). Weather in October »

November, the last month of the autumn, in Custer, is also a frosty month, with temperature in the range of an average low of 29.1°F (-1.6°C) and an average high of 43.7°F (6.5°C). In November, the average high-temperature drops, from a moderate 57.2°F (14°C) in October, to a frosty 43.7°F (6.5°C). Weather in November »

December, the first month of the winter, in Custer, is also a subzero cold month, with average temperature varying between 31.1°F (-0.5°C) and 18.5°F (-7.5°C). January and December, with an average high-temperature of 31.1°F (-0.5°C), are the coldest months. Weather in December »

What is the coldest month in Custer?

January and December, with an average high-temperature of 31.1°F (-0.5°C), are the coldest months in Custer.

What is the most humid month in Custer?

January is the most humid month in Custer, Montana, with an average relative humidity of 79%.

How many days does it rain in Custer?

In Custer, Montana, during the entire year, the rain falls for 107 days and collects up to 12.17" (309mm) of precipitation.

When does it snow in Custer?

Months with snowfall in Custer are January through May, September through December.

How many days does it snow in Custer?

In Custer, Montana, during the entire year, snow falls for 48.3 days, and aggregates up to 17.68" (449mm) of snow.

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

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Custer.

What is the snowiest month in Custer?

February is the month with the most snowfall. Snow falls for 10.6 days and accumulates 4.29" (109mm) of snow.

What is the month with the least sunshine in Custer?

With an average of 5.2h of sunshine, February has the least sunshine of the year in Custer, Montana.

What is the wettest month in Custer?

May is the month with the most rainfall in Custer, Montana. Rain falls for 14.3 days and accumulates 1.85" (47mm) of precipitation.

When it does not snow in Custer?

In Custer snow does not fall in June through August.

When are the longest days in Custer?

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

What is the warmest month in Custer?

July is the warmest month in Custer, with an average high-temperature of 86.5°F (30.3°C) and an average low-temperature of 64.2°F (17.9°C).

What month has the most sunshine in Custer?

July has the most sunshine of the year in Custer, Montana, with an average of 11.8h of sunshine.

When is the highest UV index in Custer?

July is the month with the highest UV index, with an average maximum UV index of 7.

What is the least humid month in Custer?

With an average relative humidity of 38%, August is the least humid month.

What is the driest month in Custer?

December is the month with the least rainfall in Custer, Montana. Rain falls for 4.5 days and accumulates 0.55" (14mm) of precipitation.

What is the month with the shortest days in Custer?

With an average of 8.7h of daylight, December has the shortest days of the year in Custer, Montana.
Average temperature - Custer, MT
Average pressure - Custer, MT

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.84").

Average wind speed - Custer, MT

The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.2mph).

Average rainfall - Custer, MT
Average rainfall days - Custer, MT

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is December (4.5 days).

Average snowfall - Custer, MT
Average snowfall days - Custer, MT

The month with the highest number of snowfall days is February (10.6 days).
Months with the least snowfall days are June, July and August (0 days).

Average daylight / Average sunshine - Custer, 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).

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 5.2h).

Average sunshine days - Custer, MT

The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is April (13.5 days).

Average UV index - Custer, MT
Average visibility - Custer, 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).