Climate in Charleston, Illinois

Charleston, Illinois gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Charleston averages 15 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 202 sunny days per year in Charleston. The US average is 205 sunny days.

Charleston gets some kind of precipitation, on average, 111 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 86 degrees
Winter Low: the January low is 20
Rain: averages 40 inches of rain a year
Snow: averages 15 inches of snow a year

BESTPLACES COMFORT INDEX

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

July is the hottest month for Charleston with an average high temperature of 86.2°, which ranks it as warmer than most places in Illinois. In Charleston, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Charleston are September, May and June.

In Charleston, there are 20.6 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.

January has the coldest nighttime temperatures for Charleston with an average of 20.2°. This is warmer than most places in Illinois.

In Charleston, there are 103.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Charleston, there are 3.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

The humidity can be uncomfortably heavy or close in Charleston during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in Charleston.

May is the wettest month in Charleston with 4.4 inches of rain, and the driest month is February with 2.1 inches. The wettest season is Autumn with 29% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 40.3 inches in Charleston means that it is wetter than most places in Illinois.

May is the rainiest month in Charleston with 11.7 days of rain, and September is the driest month with only 7.0 rainy days. There are 111.3 rainy days annually in Charleston, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Winter with only a 23% chance of a rainy day.

An annual snowfall of 15.1 inches in Charleston means that it is less snowy than most places in Illinois. January is the snowiest month in Charleston with 6.2 inches of snow, and 4 months of the year have significant snowfall.

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