Williamson County, TN Climate

Williamson County, TN has a humid subtropical climate with hot and humid summers and cool winters. The county experiences four distinct seasons, each of which brings its own unique weather conditions. Summer temperatures are often in the upper 80s and low 90s, while winter temperatures can dip as low as the high 20s. Rainfall is abundant throughout the year, averaging around 50 inches annually. Spring and fall bring milder weather, when temperatures generally stay between 65-75 degrees. There is also plenty of sunshine throughout the year to enjoy outdoor activities.

Williamson County, Tennessee gets 54 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Williamson County averages 3 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 208 sunny days per year in Williamson County. The US average is 205 sunny days.

Williamson County gets some kind of precipitation, on average, 120 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 26
Rain: averages 54 inches of rain a year
Snow: averages 3 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Williamson County is 7.3 (10=best), which means it is about average compared to other places in Tennessee.

7.1 Summer - 6.1 Winter

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

Climate	Williamson, Tennessee	United States
	53.6 in.	38.1 in.
	3.1 in.	27.8 in.
	119.7 days	106.2 days
	208 days	205 days
	89.1°	85.8°
	26.2°	21.7°
	7.3	7
	4.5	4.3
	782 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.

August is the hottest month for Williamson County with an average high temperature of 89.1°, which ranks it as warmer than most places in Tennessee. In Williamson County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Williamson County are May, September and October.

In Williamson County, there are 38.5 days annually when the high temperature is over 90°, which is hotter than most places in Tennessee.

January has the coldest nighttime temperatures for Williamson County with an average of 26.2°. This is about average compared to other places in Tennessee.

In Williamson County, there are 87.1 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Tennessee.

In Williamson County, there are 0.4 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Tennessee.

The humidity can be uncomfortably heavy or close in Williamson 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 Williamson County.

May is the wettest month in Williamson County with 5.9 inches of rain, and the driest month is August with 3.4 inches. The wettest season is Summer with 28% of yearly precipitation and 22% occurs in Autumn, which is the driest season. The annual rainfall of 53.6 inches in Williamson County means that it is about average compared to other places in Tennessee.

May is the rainiest month in Williamson County with 11.6 days of rain, and September is the driest month with only 7.9 rainy days. There are 119.7 rainy days annually in Williamson 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 22% chance of a rainy day.

An annual snowfall of 3.1 inches in Williamson County means that it is less snowy than most places in Tennessee. January is the snowiest month in Williamson County with 1.3 inches of snow, and 2 months of the year have significant snowfall.

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