Jefferson County, MT Climate

Jefferson, MT County experiences a semi-arid continental climate with cold winters and warm summers. On average, the county receives around 15 inches of precipitation annually, while snowfall is common throughout the winter months. The area is generally dry and sunny throughout the year, with only about 19 days of measurable precipitation each year. During the summer months, temperatures can reach up to 90 degrees Fahrenheit with low humidity levels. In the cooler months, temperatures can dip below 32 degrees Fahrenheit on a regular basis.

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

Jefferson County averages 46 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 186 sunny days per year in Jefferson County. The US average is 205 sunny days.

Jefferson County gets some kind of precipitation, on average, 87 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 84 degrees
Winter Low: the January low is 14
Rain: averages 13 inches of rain a year
Snow: averages 46 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Jefferson County is 6.6 (10=best), which means it is about average compared to other places in Montana.

8.7 Summer - 4.6 Winter

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

Climate	Jefferson, Montana	United States
	12.9 in.	38.1 in.
	45.5 in.	27.8 in.
	86.7 days	106.2 days
	186 days	205 days
	83.7°	85.8°
	13.6°	21.7°
	6.6	7
	3.6	4.3
	5884 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 Jefferson County with an average high temperature of 83.7°, which ranks it as about average compared to other places in Montana. In Jefferson County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Jefferson County are June, August and July.

In Jefferson County, there are 14.7 days annually when the high temperature is over 90°, which is cooler than most places in Montana.

December has the coldest nighttime temperatures for Jefferson County with an average of 12.1°. This is about average compared to other places in Montana.

In Jefferson County, there are 188.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Montana.

In Jefferson County, there are 17.6 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Montana.

Humidity is low in Jefferson County, and some people might find the dryness to be uncomfortable. Days with noticeable humidity are rare throughout the year. A very dry climate can lead to cracked, itchy skin and dry eyes.

June is the wettest month in Jefferson County with 2.3 inches of rain, and the driest month is February with 0.4 inches. The wettest season is Autumn with 39% of yearly precipitation and 11% occurs in Spring, which is the driest season. The annual rainfall of 12.9 inches in Jefferson County means that it is drier than most places in Montana.

May is the rainiest month in Jefferson County with 11.4 days of rain, and February is the driest month with only 4.8 rainy days. There are 86.7 rainy days annually in Jefferson County, which is about average compared to other places in Montana. The rainiest season is Autumn when it rains 31% of the time and the driest is Spring with only a 18% chance of a rainy day.

An annual snowfall of 45.5 inches in Jefferson County means that it is snowier than most places in Montana. December is the snowiest month in Jefferson County with 8.0 inches of snow, and 9 months of the year have significant snowfall.

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