Climate and monthly weather forecast
Custer, MT

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Weather in January

January, like December, is another subzero cold winter month in Custer, Montana, with an average temperature ranging between min 17.6°F (-8°C) and max 31.1°F (-0.5°C). During January and December, Custer registers its lowest temperatures, averaging a high of 31.1°F (-0.5°C). Weather in January »

Weather in February

February, the last month of the winter in Custer, is a wintry month, with temperature in the range of an average high of 32°F (0°C) and an average low of 18°F (-7.8°C). Custer notes an average high-temperature of an icy 32°F (0°C) in February, hardly diverging from January. Weather in February »

Weather in March

March, the first month of the spring in Custer, is a frosty month, with an average temperature varying between 29.5°F (-1.4°C) and 45.5°F (7.5°C). March's arrival is marked by an increase in the average high-temperature, moving from a cold 32°F (0°C) in February to a chilly 45.5°F (7.5°C). Weather in March »

Weather in April

April is a fresh spring month in Custer, Montana, with an average temperature varying between 37.6°F (3.1°C) and 55.2°F (12.9°C). A shift in the average high-temperature is noticeable in April, changing from a frosty 45.5°F (7.5°C) in March to a cool 55.2°F (12.9°C). Weather in April »

Weather in May

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

Weather in June

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

Weather in July

July is a hot summer month in Custer, Montana, with an average temperature ranging between min 64.2°F (17.9°C) and max 86.5°F (30.3°C). With average temperatures fluctuating between a high of 86.5°F (30.3°C) and a low of 64.2°F (17.9°C), July stands out as the warmest month. July's mean heat index is estimated at a hot 86°F (30°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Custer, Montana, with temperature in the range of an average low of 63.1°F (17.3°C) and an average high of 84.7°F (29.3°C). August's average high-temperature stands at a moderately hot 84.7°F (29.3°C), showing little deviation from July's 86.5°F (30.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Custer, Montana, with an average temperature varying between 74.7°F (23.7°C) and 54.9°F (12.7°C). As September begins, there is a decrease in the average high-temperature, falling from a moderately hot 84.7°F (29.3°C) in August to a still warm 74.7°F (23.7°C). Weather in September »

Weather in October

October, like September, is another refreshing autumn month in Custer, Montana, with temperature in the range of an average high of 57.2°F (14°C) and an average low of 41.4°F (5.2°C). As Custer transitions into October, a noticeable drop in the average high-temperature is observed, falling from a warm 74.7°F (23.7°C) in September to a mild 57.2°F (14°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Custer, Montana, with an average temperature ranging between max 43.7°F (6.5°C) and min 29.1°F (-1.6°C). The beginning of November involves a decrease in the average high-temperature, transitioning from a mild 57.2°F (14°C) in October to a frosty 43.7°F (6.5°C). Weather in November »

Weather in December

December, the first month of the winter in Custer, is still a freezing cold month, with an average temperature ranging between max 31.1°F (-0.5°C) and min 18.5°F (-7.5°C). In Custer, the coldest months are January and December, registering an average high-temperature of 31.1°F (-0.5°C). Weather in December »

Frequently asked questions

What time of the year is the coldest?

January and December, when the average high-temperature reaches 31.1°F (-0.5°C), are the coldest months.

What is the most humid month?

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

How much does it rain?

Throughout the year, there are 107 rainfall days, and 12.17" (309mm) of precipitation is accumulated.

When does it snow?

January through May, September through December are months with snowfall.

How many days does it snow?

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

When is the lowest UV index?

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

When does it snow the most?

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?

The month with the least sunshine is February, with an average of 5.2h of sunshine.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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 rainiest month?

The month with the most rainfall is May, when the rain falls for 14.3 days and typically aggregates up to 1.85" (47mm) of precipitation.

When it does not snow?

In Custer, snow does not fall in June through August.

When are the longest days in Custer?

The month with the longest days is June, with an average of 15h and 42min of daylight.

What are the warmest months?

The average temperatures reach their apex in July, averaging 86.5°F (30.3°C) at the high end and 64.2°F (17.9°C) at the low end.

What month has the most sunshine?

With an average of 11.8h of sunshine, July has the most sunshine of the year.

What is the month with the highest UV index?

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

What is the least humid month?

August is the least humid month in Custer, with an average relative humidity of 38%.

What is the driest month?

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

What is the month with the shortest days?

December has the shortest days of the year, with an average of 8h and 42min of daylight.

Average temperature
Custer, MT

Average temperature - Custer, MT

The warmest month (with the highest average high temperature) is July (86.5°F).
The months with the lowest average high temperature are January and December (31.1°F).

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).

Average pressure
Custer, MT

Average pressure - Custer, MT

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

Average wind speed
Custer, MT

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 humidity
Custer, MT

Average humidity - Custer, MT

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (38%).

Average rainfall
Custer, MT

Average rainfall - Custer, MT

The wettest month (with the highest rainfall) is May (1.85").
The driest month (with the least rainfall) is December (0.55").

Average rainfall days
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 - Custer, MT

The month with the highest snowfall is February (4.29").
The months with the least snowfall are June, July and August (0").

Average snowfall days
Custer, MT

Average snowfall days - Custer, MT

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

Average daylight / Average sunshine
Custer, MT

Average daylight / Average sunshine - Custer, MT

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

Average sunshine days
Custer, MT

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 UV index - Custer, MT

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average visibility
Custer, MT

Average visibility - Custer, MT

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

Custer, Montana, USA

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