2025 Compare Climate & Weather:
Aiken, SC vs Knoxville, TN

Highlights

On average, there are 204 sunny days per year in Knoxville. Aiken averages 216 sunny days per year. The US average is 205 sunny days.

Knoxville, Tennessee gets 50.3 inches of rain, on average, per year. Aiken, South Carolina gets 47.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Knoxville averages 5.8 inches of snow per year. Aiken averages 0.6 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Knoxville, Tennessee
Summer High: the July high is around 88.1 degrees
Winter Low: the January low is 27.9
Rain: averages 50.3 inches of rain a year
Snow: averages 5.8 inches of snow a year

Aiken, South Carolina
Summer High: the July high is around 92.1 degrees
Winter Low: the January low is 34.1
Rain: averages 47.7 inches of rain a year
Snow: averages 0.6 inches of snow a year

BestPlaces Comfort Index

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

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

Today's Weather - Aiken, SC

51°F

Today's Weather - Knoxville, TN

49°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Aiken / Knoxville

July is the hottest month for Aiken with an average high temperature of 92.1°, which ranks it as warmer than most places in South Carolina. In Aiken, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Aiken are October, April and May.

July is the hottest month for Knoxville with an average high temperature of 88.1°, which ranks it as cooler than most places in Tennessee. In Knoxville, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Knoxville are May, September and October.

January has the coldest nighttime temperatures for Aiken with an average of 34.1°. This is warmer than most places in South Carolina.

January has the coldest nighttime temperatures for Knoxville with an average of 27.9°. This is warmer than most places in Tennessee.

In Aiken, there are 64.7 days annually when the high temperature is over 90°, which is hotter than most places in South Carolina.

In Knoxville, there are 29.7 days annually when the high temperature is over 90°, which is cooler than most places in Tennessee.

In Aiken, there are 42.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Carolina.

In Knoxville, there are 78.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Tennessee.

In Aiken, 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 Knoxville, there are 0.3 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Tennessee.

August is the wettest month in Aiken with 4.9 inches of rain, and the driest month is April with 3.0 inches. The wettest season is Autumn with 31% of yearly precipitation and 21% occurs in Winter, which is the driest season. The annual rainfall of 47.7 inches in Aiken means that it is wetter than most places in South Carolina.


July is the wettest month in Knoxville with 5.2 inches of rain, and the driest month is October with 2.7 inches. The wettest season is Spring with 28% of yearly precipitation and 21% occurs in Winter, which is the driest season. The annual rainfall of 50.3 inches in Knoxville means that it is drier than most places in Tennessee.

July is the rainiest month in Aiken with 10.6 days of rain, and October is the driest month with only 6.5 rainy days. There are 103.0 rainy days annually in Aiken, which is about average compared to other places in South Carolina. The rainiest season is Autumn when it rains 30% of the time and the driest is Winter with only a 21% chance of a rainy day.

March is the rainiest month in Knoxville with 12.0 days of rain, and September is the driest month with only 8.1 rainy days. There are 127.3 rainy days annually in Knoxville, which is rainier than most places in Tennessee. The rainiest season is Summer when it rains 27% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 0.6 inches in Aiken means that it is less snowy than most places in South Carolina.

An annual snowfall of 5.8 inches in Knoxville means that it is snowier than most places in Tennessee.

January is the snowiest month in Aiken with 0.4 inches of snow, and no months of the year have significant snowfall.

January is the snowiest month in Knoxville with 2.4 inches of snow, and 4 months of the year have significant snowfall.