The climate in Mattoon, IL is humid and continental. The summers are hot and humid with temperatures averaging in the mid-80s and sometimes reaching into the 90s. Winters are cold with temperatures averaging in the high 20s to mid 30s, with occasional snowfall from November through March. Spring and fall are mild with temperatures ranging from the 40s to 70s. Overall, Mattoon has a typical Midwestern climate.
Mattoon, Illinois gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Mattoon averages 16 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 201 sunny days per year in Mattoon. The US average is 205 sunny days.
Mattoon gets some kind of precipitation, on average, 112 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 16 inches of snow a year