Custer County, ID Climate

Custer County, Idaho has a semi-arid climate, with warm summers and cold winters. In the summer months, temperatures can reach up to 90 degrees Fahrenheit during the day and drop to the mid 40s at night. Winters see temperatures of about 20 degrees Fahrenheit during the day and dropping below zero at night. Precipitation is fairly low in Custer County averaging about 10 inches per year, with most of that falling as snow in the winter months. Despite this lack of precipitation, the county's rolling hills are often covered in lush grasses and wildflowers due to its ample water from underground aquifers.

Custer County, Idaho gets 12 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Custer County averages 60 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 200 sunny days per year in Custer County. The US average is 205 sunny days.

Custer County gets some kind of precipitation, on average, 63 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 82 degrees
Winter Low: the January low is 4
Rain: averages 12 inches of rain a year
Snow: averages 60 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Custer County is 6.3 (10=best), which means it is less comfortable than most places in Idaho.

8.6 Summer - 3.9 Winter

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

Climate	Custer, Idaho	United States
	11.6 in.	38.1 in.
	60.3 in.	27.8 in.
	62.7 days	106.2 days
	200 days	205 days
	82.0°	85.8°
	4.2°	21.7°
	6.3	7
	4	4.3
	7601 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 82.0°, which ranks it as cooler than most places in Idaho. In Custer County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Custer County are August, July and June.

In Custer County, there are 8.9 days annually when the high temperature is over 90°, which is cooler than most places in Idaho.

January has the coldest nighttime temperatures for Custer County with an average of 4.2°. This is one of the coldest places in Idaho.

In Custer County, there are 240.1 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Idaho.

In Custer County, there are 36.0 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Idaho.

Humidity is very low in Custer County, so low that the dry air may be uncomfortable for some people. There are few days during the year when the humidity is even noticable. A very dry climate can lead to cracked, itchy skin and dry eyes.

June is the wettest month in Custer County with 1.4 inches of rain, and the driest month is July with 0.7 inches. The wettest season is Summer with 29% of yearly precipitation and 23% occurs in Winter, which is the driest season. The annual rainfall of 11.6 inches in Custer County means that it is drier than most places in Idaho.

May is the rainiest month in Custer County with 6.8 days of rain, and September is the driest month with only 3.5 rainy days. There are 62.7 rainy days annually in Custer County, which is one of the least rainy places in Idaho. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 60.3 inches in Custer County means that it is snowier than most places in Idaho. December is the snowiest month in Custer County with 16.5 inches of snow, and 8 months of the year have significant snowfall.

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