Illinois, Illinois, gets 40 inches of rain per year. The US average is 39. Snowfall is 18 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 71.
On average, there are 198 sunny days per year in Illinois, Illinois. The July high is around 86 degrees. The January low is 19. Sperling's comfort index for Illinois is a 41 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.
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