DeKalb County, IL has a humid continental climate with hot, humid summers and cold, snowy winters. During the summer months, temperatures can reach up to 90 degrees Fahrenheit and often experience high levels of humidity. The winter months can be quite cold with temperatures typically reaching between 0 to 35 degrees Fahrenheit. Precipitation is common throughout the year with an average of around 38 inches annually. Snowfall is usually light but can sometimes exceed 20 inches during the winter months. DeKalb County also experiences thunderstorms in the spring and summer months as well as occasional tornadoes due to its location in tornado alley.
DeKalb County, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.
DeKalb County averages 31 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 DeKalb County. The US average is 205 sunny days.
DeKalb County gets some kind of precipitation, on average, 115 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 83 degrees
Winter Low: the January low is 13
Rain: averages 37 inches of rain a year
Snow: averages 31 inches of snow a year