Glen Ellyn, IL experiences a humid continental climate, which is characterized by warm summers and cold winters. Average temperatures range from the mid-30s (Fahrenheit) in January to the mid-80s in July. The town receives an average of thirty-four inches of precipitation each year. Snowfall averages about fifteen inches each winter, with occasional snow storms bringing heavier totals. Due to its location in northeastern Illinois, Glen Ellyn is prone to strong thunderstorms during the spring and summer months; these storms often bring heavy rains and occasionally hail or high winds. During the autumn months, the trees in Glen Ellyn put on a spectacular display of fall colors that are well worth seeing.
Glen Ellyn, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Glen Ellyn averages 33 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 191 sunny days per year in Glen Ellyn. The US average is 205 sunny days.
Glen Ellyn gets some kind of precipitation, on average, 122 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 84 degrees
Winter Low: the January low is 15
Rain: averages 39 inches of rain a year
Snow: averages 33 inches of snow a year