Glen Carbon, IL has a humid continental climate. The summers are hot with mild to warm temperatures, and the winters are cold with moderate snowfall. Average annual snowfall is 26 inches. Average summer temperatures range from the mid-70s to low 80s while average winter temperatures range from the 20s to low 30s. Rainfall is abundant throughout the year with an average of 42 inches per year. Humidity levels remain high during the summer months and decrease slightly in winter months.
Glen Carbon, Illinois gets 43 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Glen Carbon averages 12 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 204 sunny days per year in Glen Carbon. The US average is 205 sunny days.
Glen Carbon gets some kind of precipitation, on average, 99 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 89 degrees
Winter Low: the January low is 22
Rain: averages 43 inches of rain a year
Snow: averages 12 inches of snow a year