Granite City, IL has a moderate climate with four distinct seasons. Summer temperatures can reach the low 90s Fahrenheit and winter temperatures can dip to the low 20s. Spring and fall are generally mild, with temperatures ranging from the lower 40s to mid-70s. Precipitation levels vary throughout the year, from an average of 38 inches per year in winter to nearly 4 inches in summer. Snowfall accumulates up to 12 inches per year on average. The city also experiences some thunderstorms during the warm season months which can bring heavy rain and hail.
Granite City, Illinois gets 42 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Granite City averages 15 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 Granite City. The US average is 205 sunny days.
Granite City gets some kind of precipitation, on average, 103 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 88 degrees
Winter Low: the January low is 22
Rain: averages 42 inches of rain a year
Snow: averages 15 inches of snow a year