Clayton, IL has a humid continental climate with four distinct seasons. In the summertime, temperatures average in the mid 70s to low 80s Fahrenheit and can reach up to the high 90s with occasional heat waves. Winters are cold with temperatures averaging in the mid-30s to low 40s Fahrenheit and occasionally dropping below freezing. Spring and fall are mild with temperatures generally hovering around 50-60 degrees Fahrenheit. The area receives numerous inches of rain throughout the year, as well as an occasional snowfall in winter months.
Clayton, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Clayton averages 17 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 Clayton. The US average is 205 sunny days.
Clayton gets some kind of precipitation, on average, 92 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 17
Rain: averages 39 inches of rain a year
Snow: averages 17 inches of snow a year