2025 Compare Climate & Weather:
Summerville, SC vs Chattanooga, TN

Highlights

On average, there are 207 sunny days per year in Chattanooga. Summerville averages 209 sunny days per year. The US average is 205 sunny days.

Chattanooga, Tennessee gets 51.1 inches of rain, on average, per year. Summerville, South Carolina gets 51 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Chattanooga averages 1.5 inches of snow per year. Summerville averages 0.7 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Chattanooga, Tennessee
Summer High: the July high is around 89 degrees
Winter Low: the January low is 28.9
Rain: averages 51.1 inches of rain a year
Snow: averages 1.5 inches of snow a year

Summerville, South Carolina
Summer High: the July high is around 91.5 degrees
Winter Low: the January low is 34.6
Rain: averages 51 inches of rain a year
Snow: averages 0.7 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Chattanooga is 7.5 (10=best), which means it is one of the most pleasant places in Tennessee.

The annual BestPlaces Comfort Index for Summerville is 7.3 (10=best), which means it is less comfortable than most places in South Carolina.

Today's Weather - Summerville, SC

86°F

Today's Weather - Chattanooga, TN

76°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Summerville / Chattanooga

July is the hottest month for Summerville with an average high temperature of 91.5°, which ranks it as warmer than most places in South Carolina. In Summerville, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Summerville are October, April and May.

July is the hottest month for Chattanooga with an average high temperature of 89.0°, which ranks it as warmer than most places in Tennessee. In Chattanooga, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chattanooga are May, September and October.

January has the coldest nighttime temperatures for Summerville with an average of 34.6°. This is warmer than most places in South Carolina.

January has the coldest nighttime temperatures for Chattanooga with an average of 28.9°. This is one of the warmest places in Tennessee.

In Summerville, there are 60.7 days annually when the high temperature is over 90°, which is hotter than most places in South Carolina.

In Chattanooga, there are 39.0 days annually when the high temperature is over 90°, which is hotter than most places in Tennessee.

In Summerville, there are 39.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Carolina.

In Chattanooga, there are 71.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Tennessee.

In Summerville, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in South Carolina.

In Chattanooga, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Tennessee.

August is the wettest month in Summerville with 6.7 inches of rain, and the driest month is November with 2.8 inches. The wettest season is Autumn with 36% of yearly precipitation and 20% occurs in Summer, which is the driest season. The annual rainfall of 51.0 inches in Summerville means that it is wetter than most places in South Carolina.


December is the wettest month in Chattanooga with 4.9 inches of rain, and the driest month is October with 3.2 inches. The wettest season is Spring with 29% of yearly precipitation and 23% occurs in Autumn, which is the driest season. The annual rainfall of 51.1 inches in Chattanooga means that it is drier than most places in Tennessee.

August is the rainiest month in Summerville with 12.3 days of rain, and November is the driest month with only 6.7 rainy days. There are 103.7 rainy days annually in Summerville, which is about average compared to other places in South Carolina. The rainiest season is Autumn when it rains 33% of the time and the driest is Summer with only a 21% chance of a rainy day.

December is the rainiest month in Chattanooga with 9.2 days of rain, and October is the driest month with only 6.3 rainy days. There are 99.0 rainy days annually in Chattanooga, which is one of the least rainy places in Tennessee. The rainiest season is Spring when it rains 28% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 0.7 inches in Summerville means that it is about average compared to other places in South Carolina.

An annual snowfall of 1.5 inches in Chattanooga means that it is one of the least snowy places in Tennessee.

December is the snowiest month in Summerville with 0.3 inches of snow, and no months of the year have significant snowfall.

January is the snowiest month in Chattanooga with 0.6 inches of snow, and 1 month of the year have significant snowfall.