Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
During January and December, Custer registers its lowest temperatures, averaging a high of 31.1°F (-0.5°C).Humidity
With an average relative humidity of 79%, January is the most humid month.Rainfall
In Custer, in January, it is raining for 5.3 days, with typically 0.59" (15mm) of accumulated precipitation. Throughout the year, there are 107 rainfall days, and 12.17" (309mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Custer. In January, it is snowing for 9.8 days. Throughout January, 3.07" (78mm) of snow is accumulated. Throughout the year, in Custer, there are 48.3 snowfall days, and 17.68" (449mm) of snow is accumulated.Daylight
In January, the average length of the day is 9h and 7min.On the first day of the month, sunrise is at 7:52 am and sunset at 4:34 pm. On the last day of January, in Custer, sunrise is at 7:34 am and sunset at 5:13 pm MST.
Sunshine
In Custer, the average sunshine in January is 5.4h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 2 during January translates into the following guidance:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
How cold is it in January?
What is the most humid month in Custer?
What is the average humidity in January?
How much does it rain in January?
How many days does it snow in January in Custer?
What is the average length of the day in January in Custer?
When are sunrise and sunset in January?
How many hours of sunshine does Custer have in January?
When is the lowest UV index?
What is the UV index reading in January?
Average temperature in January
Custer, MT
- Average high temperature in January: 31.1°F
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).
- Average low temperature in January: 17.6°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 in January
Custer, MT
- Average pressure in January: 30.13"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 in January
Custer, MT
- Average wind speed in January: 9.7mph
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 in January
Custer, MT
- Average humidity in January: 79%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (38%).
Average rainfall in January
Custer, MT
- Average rainfall in January: 0.59"
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 in January
Custer, MT
- Average rainfall days in January: 5.3 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 in January
Custer, MT
- Average snowfall in January: 3.07"
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 in January
Custer, MT
- Average snowfall days in January: 9.8 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 in January /
Average sunshine in January
Custer, MT
- Average daylight in January: 9h and 1min
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 2min
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 in January
Custer, MT
- Average sunshine days in January: 17.8 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 in January
Custer, MT
- Average UV index in January: 2
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 in January
Custer, MT
- Average cloud cover in January: 43
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 in January
Custer, MT
- Average visibility in January: 6mi
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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