Custer County, MT Climate

Located in Big Sky country, Custer County, Montana has a semi-arid climate with warm summers and cold winters. In summer, temperatures can reach up to 90 degrees Fahrenheit during the day, while nights are usually cool at around 40-50 degrees. Winters are colder in Custer County with temperatures falling into the teens during the day and below zero at night. Precipitation is generally low throughout the year, with an average of about 10 inches annually. Snowfall accumulates from November through April with an average of 40-60 inches per year. Summers are generally dry and sunny, making Custer County a great spot for outdoor activities such as hiking, camping, fishing and more.

Custer County, Montana gets 13 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Custer County averages 31 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 203 sunny days per year in Custer County. The US average is 205 sunny days.

Custer County gets some kind of precipitation, on average, 79 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 89 degrees
Winter Low: the January low is 7
Rain: averages 13 inches of rain a year
Snow: averages 31 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Custer County is 6.8 (10=best), which means it is more comfortable than most places in Montana.

8.6 Summer - 4.6 Winter

June, September and August are the most pleasant months in Custer County, while January and December are the least comfortable months.

Climate	Custer, Montana	United States
	13.4 in.	38.1 in.
	30.5 in.	27.8 in.
	78.6 days	106.2 days
	203 days	205 days
	88.8°	85.8°
	6.8°	21.7°
	6.8	7
	3.6	4.3
	2846 ft.	2443 ft.

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Custer County with an average high temperature of 88.8°, which ranks it as one of the hottest places in Montana. In Custer County, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Custer County are June, September and May.

In Custer County, there are 38.1 days annually when the high temperature is over 90°, which is one of the hottest places in Montana.

January has the coldest nighttime temperatures for Custer County with an average of 6.8°. This is colder than most places in Montana.

In Custer County, there are 182.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Montana.

In Custer County, there are 28.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Montana.

Humidity in Custer County is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and June.

June is the wettest month in Custer County with 2.4 inches of rain, and the driest month is January with 0.4 inches. The wettest season is Autumn with 39% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 13.4 inches in Custer County means that it is drier than most places in Montana.

June is the rainiest month in Custer County with 9.9 days of rain, and February is the driest month with only 4.5 rainy days. There are 78.6 rainy days annually in Custer County, which is less rainy than most places in Montana. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 19% chance of a rainy day.

An annual snowfall of 30.5 inches in Custer County means that it is less snowy than most places in Montana. March is the snowiest month in Custer County with 5.5 inches of snow, and 8 months of the year have significant snowfall.

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