The climate in Crystal Lake, IL is a humid continental climate with warm summers and cold winters. Summers are typically hot and humid, with temperatures reaching into the mid-80s Fahrenheit during the day and high humidity levels. Winters are cold, often dropping into the single digits at night and averaging around 30-35 degrees during the day. Precipitation is fairly regular throughout the year, mostly in the form of rain but occasional snowfall as well. The area experiences all four seasons, making it an ideal location for outdoor activities throughout much of the year.
Crystal Lake, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Crystal Lake averages 35 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 186 sunny days per year in Crystal Lake. The US average is 205 sunny days.
Crystal Lake gets some kind of precipitation, on average, 114 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 82 degrees
Winter Low: the January low is 13
Rain: averages 37 inches of rain a year
Snow: averages 35 inches of snow a year