2025 Compare Climate & Weather:
Rockford, IL vs Charleston, SC

Highlights

On average, there are 209 sunny days per year in Charleston. Rockford averages 188 sunny days per year. The US average is 205 sunny days.

Charleston, South Carolina gets 48.3 inches of rain, on average, per year. Rockford, Illinois gets 37.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Charleston averages 0.4 inches of snow per year. Rockford averages 35.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Charleston, South Carolina
Summer High: the July high is around 89.9 degrees
Winter Low: the January low is 39.3
Rain: averages 48.3 inches of rain a year
Snow: averages 0.4 inches of snow a year

Rockford, Illinois
Summer High: the July high is around 83.7 degrees
Winter Low: the January low is 12.7
Rain: averages 37.1 inches of rain a year
Snow: averages 35.1 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Charleston is 7.2 (10=best), which means it is less comfortable than most places in South Carolina.

The annual BestPlaces Comfort Index for Rockford is 6.8 (10=best), which means it is less comfortable than most places in Illinois.

Today's Weather - Rockford, IL

62°F

Today's Weather - Charleston, SC

71°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Rockford / Charleston

July is the hottest month for Rockford with an average high temperature of 83.7°, which ranks it as cooler than most places in Illinois. In Rockford, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rockford are June, September and August.

July is the hottest month for Charleston with an average high temperature of 89.9°, which ranks it as cooler than most places in South Carolina. In Charleston, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Charleston are October, May and April.

January has the coldest nighttime temperatures for Rockford with an average of 12.7°. This is one of the coldest places in Illinois.

January has the coldest nighttime temperatures for Charleston with an average of 39.3°. This is one of the warmest places in South Carolina.

In Rockford, there are 12.1 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Charleston, there are 41.1 days annually when the high temperature is over 90°, which is cooler than most places in South Carolina.

In Rockford, there are 138.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Charleston, there are 17.5 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in South Carolina.

In Rockford, there are 12.9 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.

In Charleston, 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.

June is the wettest month in Rockford with 4.9 inches of rain, and the driest month is January with 1.4 inches. The wettest season is Autumn with 37% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 37.1 inches in Rockford means that it is drier than most places in Illinois.


August is the wettest month in Charleston with 6.7 inches of rain, and the driest month is May with 2.5 inches. The wettest season is Autumn with 36% of yearly precipitation and 19% occurs in Summer, which is the driest season. The annual rainfall of 48.3 inches in Charleston means that it is wetter than most places in South Carolina.

May is the rainiest month in Rockford with 12.0 days of rain, and February is the driest month with only 8.0 rainy days. There are 116.0 rainy days annually in Rockford, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.

August is the rainiest month in Charleston with 11.7 days of rain, and May is the driest month with only 6.8 rainy days. There are 105.9 rainy days annually in Charleston, which is rainier than most places in South Carolina. The rainiest season is Autumn when it rains 32% of the time and the driest is Summer with only a 21% chance of a rainy day.

An annual snowfall of 35.1 inches in Rockford means that it is one of the snowiest places in Illinois.

An annual snowfall of 0.4 inches in Charleston means that it is less snowy than most places in South Carolina.

December is the snowiest month in Rockford with 11.4 inches of snow, and 6 months of the year have significant snowfall.

December is the snowiest month in Charleston with 0.2 inches of snow, and no months of the year have significant snowfall.