2025 Compare Climate & Weather:
Clayton, MO vs Charleston, SC

Highlights

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

Charleston, South Carolina gets 48.3 inches of rain, on average, per year. Clayton, Missouri gets 43.2 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. Clayton averages 15.9 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

Clayton, Missouri
Summer High: the July high is around 88.7 degrees
Winter Low: the January low is 23.1
Rain: averages 43.2 inches of rain a year
Snow: averages 15.9 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 Clayton is 7.2 (10=best), which means it is more comfortable than most places in Missouri.

Today's Weather - Clayton, MO

70°F

Today's Weather - Charleston, SC

81°F

Average Monthly High / Low (°F)

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

July is the hottest month for Clayton with an average high temperature of 88.7°, which ranks it as warmer than most places in Missouri. In Clayton, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Clayton are May, September and June.

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 Clayton with an average of 23.1°. This is warmer than most places in Missouri.

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 Clayton, there are 36.9 days annually when the high temperature is over 90°, which is hotter than most places in Missouri.

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 Clayton, there are 87.2 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Missouri.

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 Clayton, there are 1.8 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Missouri.

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.

May is the wettest month in Clayton with 4.9 inches of rain, and the driest month is February with 2.4 inches. The wettest season is Summer with 28% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 43.2 inches in Clayton means that it is about average compared to other places in Missouri.


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 Clayton with 11.2 days of rain, and September is the driest month with only 7.0 rainy days. There are 105.0 rainy days annually in Clayton, which is rainier than most places in Missouri. The rainiest season is Summer when it rains 30% of the time and the driest is Spring 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 15.9 inches in Clayton means that it is snowier than most places in Missouri.

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

January is the snowiest month in Clayton with 5.0 inches of snow, and 5 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.