Charleston, IL has a humid continental climate that is characterized by hot and humid summers, cold and snowy winters, and moderate spring and fall seasons. The average annual temperature in Charleston is 56°F with an average of 43 inches of precipitation per year. In July, the warmest month of the year, temperatures can exceed 90 degrees Fahrenheit while January brings the coldest temperatures with an average low temperature of 18°F. Snowfall in the area averages about 12 inches per winter season. Spring and fall are mild with temperatures ranging between 30-60 degrees Fahrenheit.
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