Naperville, Illinois, gets 38 inches of rain per year. The US average is 39. Snowfall is 29 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 73.
On average, there are 189 sunny days per year in Naperville, Illinois. The July high is around 84 degrees. The January low is 15. Sperling's comfort index for Naperville is a 43 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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