Potomac, IL experiences a humid continental climate with hot summers and cold winters. During the summer months, temperatures typically range from the mid-seventies to the high eighties. In winter, temperatures dip well below freezing and snowfall is common. Spring and autumn are milder seasons with periods of rain and occasional thunderstorms. The town of Potomac enjoys four distinct seasons throughout the year.
Potomac, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Potomac averages 15 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 190 sunny days per year in Potomac. The US average is 205 sunny days.
Potomac gets some kind of precipitation, on average, 109 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 18
Rain: averages 39 inches of rain a year
Snow: averages 15 inches of snow a year