2025 Compare Climate & Weather:
Charleston, SC vs Mount Vernon, IN

Highlights

On average, there are 204 sunny days per year in Mount Vernon. Charleston averages 209 sunny days per year. The US average is 205 sunny days.

Mount Vernon, Indiana gets 46.4 inches of rain, on average, per year. Charleston, South Carolina gets 48.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Mount Vernon averages 9.1 inches of snow per year. Charleston averages 0.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Mount Vernon, Indiana
Summer High: the July high is around 89.4 degrees
Winter Low: the January low is 26.2
Rain: averages 46.4 inches of rain a year
Snow: averages 9.1 inches of snow a year

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

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Mount Vernon is 7.2 (10=best), which means it is one of the most pleasant places in Indiana.

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

Today's Weather - Charleston, SC

83°F

Today's Weather - Mount Vernon, IN

69°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Charleston / Mount Vernon

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.

July is the hottest month for Mount Vernon with an average high temperature of 89.4°, which ranks it as one of the hottest places in Indiana. In Mount Vernon, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mount Vernon are May, September and October.

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

January has the coldest nighttime temperatures for Mount Vernon with an average of 26.2°. This is one of the warmest places in Indiana.

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 Mount Vernon, there are 44.8 days annually when the high temperature is over 90°, which is one of the hottest places in Indiana.

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 Mount Vernon, there are 72.7 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Indiana.

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.

In Mount Vernon, there are 0.7 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Indiana.

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 wettest month in Mount Vernon with 5.6 inches of rain, and the driest month is August with 3.0 inches. The wettest season is Summer with 31% of yearly precipitation and 23% occurs in Spring, which is the driest season. The annual rainfall of 46.4 inches in Mount Vernon means that it is wetter than most places in Indiana.

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.

May is the rainiest month in Mount Vernon with 11.1 days of rain, and August is the driest month with only 6.4 rainy days. There are 108.1 rainy days annually in Mount Vernon, which is less rainy than most places in Indiana. The rainiest season is Summer when it rains 30% of the time and the driest is Winter with only a 22% chance of a rainy day.

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

An annual snowfall of 9.1 inches in Mount Vernon means that it is one of the least snowy places in Indiana.

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

February is the snowiest month in Mount Vernon with 2.8 inches of snow, and 4 months of the year have significant snowfall.