Jefferson County, TN Climate

Jefferson, TN County experiences a humid subtropical climate which is characterized by mild winters and hot summers. The average temperature in the winter months of December, January, and February ranges from the mid-30s to low 40s, while the summer months of June, July, and August have average temperatures ranging from the mid-70s to low 80s. Precipitation is fairly consistent throughout the year with an average of around 4 inches each month. While summers can be quite humid, they are also generally mild and bearable due to the low humidity levels that are present in the air.

Jefferson County, Tennessee gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Jefferson County averages 7 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 204 sunny days per year in Jefferson County. The US average is 205 sunny days.

Jefferson County gets some kind of precipitation, on average, 121 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 87 degrees
Winter Low: the January low is 25
Rain: averages 45 inches of rain a year
Snow: averages 7 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Jefferson County is 7.4 (10=best), which means it is more comfortable than most places in Tennessee.

7.6 Summer - 6.1 Winter

September, May and October are the most pleasant months in Jefferson County, while January and December are the least comfortable months.

Climate	Jefferson, Tennessee	United States
	Unlock	38.1 in.
	6.5 in.	Unlock
	Unlock	106.2 days
	204 days	Unlock
	87.2°	85.8°
	Unlock	21.7°
	7.4	Unlock
	Unlock	4.3
	1145 ft.	Unlock

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 87.2°, which ranks it as cooler than most places in Tennessee. 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 May, September and June.

In Jefferson County, there are 23.8 days annually when the high temperature is over 90°, which is cooler than most places in Tennessee.

January has the coldest nighttime temperatures for Jefferson County with an average of 25.3°. This is colder than most places in Tennessee.

In Jefferson County, there are 94.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Tennessee.

In Jefferson County, there are 0.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Tennessee.

The humidity can be uncomfortably heavy or close in Jefferson County during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in Jefferson County.

July is the wettest month in Jefferson County with 4.7 inches of rain, and the driest month is October with 2.3 inches. The wettest season is Summer with 27% of yearly precipitation and 20% occurs in Winter, which is the driest season. The annual rainfall of 45.2 inches in Jefferson County means that it is one of the driest places in Tennessee.

March is the rainiest month in Jefferson County with 11.5 days of rain, and September is the driest month with only 7.7 rainy days. There are 120.7 rainy days annually in Jefferson County, which is rainier than most places in Tennessee. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 20% chance of a rainy day.

An annual snowfall of 6.5 inches in Jefferson County means that it is snowier than most places in Tennessee. January is the snowiest month in Jefferson County with 2.4 inches of snow, and 4 months of the year have significant snowfall.

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