Climate and monthly weather forecastCuster, MT
Climate and monthly weather forecast
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 »Updated: Aug 6, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January and December, when the average high-temperature reaches 31.1°F (-0.5°C), are the coldest months.
The most humid month is January, with an average relative humidity of 79%.
Throughout the year, there are 107 rainfall days, and 12.17" (309mm) of precipitation is accumulated.
January through May, September through December are months with snowfall.
In Custer, during the entire year, snow falls for 48.3 days and aggregates up to 17.68" (449mm) of snow.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
February is the month with the most snowfall. Snow falls for 10.6 days and accumulates 4.29" (109mm) of snow.
The month with the least sunshine is February, with an average of 5.2h of sunshine.
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.
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.
In Custer, snow does not fall in June through August.
The month with the longest days is June, with an average of 15h and 42min of daylight.
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.
With an average of 11.8h of sunshine, July has the most sunshine of the year.
July is the month with the highest UV index, with an average maximum UV index of 7.
August is the least humid month in Custer, with an average relative humidity of 38%.
December is the month with the least rainfall in Custer. Rain falls for 4.5 days and accumulates 0.55" (14mm) of precipitation.
December has the shortest days of the year, with an average of 8h and 42min of daylight.
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 in January:
30.13"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.84"Hg
- Average pressure in July:
29.89"Hg - Average pressure in August:
29.89"Hg - Average pressure in September:
29.93"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.05"Hg - Average pressure in December:
30.12"Hg
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 in January:
9.7mph - Average wind speed in February:
8.9mph - Average wind speed in March:
8.9mph - Average wind speed in April:
10.2mph - Average wind speed in May:
9.9mph - Average wind speed in June:
9.1mph
- Average wind speed in July:
8.2mph - Average wind speed in August:
8.2mph - Average wind speed in September:
8.8mph - Average wind speed in October:
9.6mph - Average wind speed in November:
9.4mph - Average wind speed in December:
9.4mph
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
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 in January:
0.59" - Average rainfall in February:
0.71" - Average rainfall in March:
0.83" - Average rainfall in April:
1.5" - Average rainfall in May:
1.85" - Average rainfall in June:
1.65"
- Average rainfall in July:
0.87" - Average rainfall in August:
0.98" - Average rainfall in September:
1.26" - Average rainfall in October:
0.79" - Average rainfall in November:
0.59" - Average rainfall in December:
0.55"
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 in January:
5.3 days - Average rainfall days in February:
4.9 days - Average rainfall days in March:
9.9 days - Average rainfall days in April:
13.7 days - Average rainfall days in May:
14.3 days - Average rainfall days in June:
11.8 days
- Average rainfall days in July:
10.3 days - Average rainfall days in August:
9.8 days - Average rainfall days in September:
7.9 days - Average rainfall days in October:
9.1 days - Average rainfall days in November:
5.5 days - Average rainfall days in December:
4.5 days
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
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 in January:
9.8 days - Average snowfall days in February:
10.6 days - Average snowfall days in March:
6.9 days - Average snowfall days in April:
3.8 days - Average snowfall days in May:
0.6 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.2 days - Average snowfall days in October:
1.9 days - Average snowfall days in November:
5.6 days - Average snowfall days in December:
8.9 days
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 in January:
9h and 6min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 42min
- Average daylight in July:
15h and 18min - Average daylight in August:
14h and 6min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 30min - Average daylight in December:
8h and 42min
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).
- Average sunshine in January:
5h and 24min - Average sunshine in February:
5h and 12min - Average sunshine in March:
7h and 24min - Average sunshine in April:
9h and 6min - Average sunshine in May:
10h and 6min - Average sunshine in June:
11h and 12min
- Average sunshine in July:
11h and 48min - Average sunshine in August:
11h and 42min - Average sunshine in September:
10h and 24min - Average sunshine in October:
6h and 24min - Average sunshine in November:
6h and 18min - Average sunshine in December:
5h and 24min
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 in January:
17.8 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
15.6 days - Average sunshine days in April:
13.5 days - Average sunshine days in May:
14 days - Average sunshine days in June:
14.6 days
- Average sunshine days in July:
16.3 days - Average sunshine days in August:
17.1 days - Average sunshine days in September:
19 days - Average sunshine days in October:
18.2 days - Average sunshine days in November:
19.2 days - Average sunshine days in December:
18.1 days
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
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 cloud cover
Custer, MT
The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 15).
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).
