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.
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
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for Glen Carbon is 7.2 (10=best), which means it is one of the most pleasant places in Illinois.
7.2 / 10
September, May and October are the most pleasant months in Glen Carbon, while January and December are the least comfortable months.