Climate in Chicago-Naperville-Joliet Metro Area, Illinois

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Climate	Chicago-Naperville-Joliet, IL	United States
Rainfall (in.)	35.3	36.5
Snowfall (in.)	29.6	25
Precipitation Days	114	100
Sunny Days	197	205
Avg. July High	84.2	86.5
Avg. Jan. Low	14.6	20.5
Comfort Index (higher=better)	46	44
UV Index	3.6	4.3
Elevation ft.	714	1,443

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Chicago-Naperville-Joliet Metro Area, IL, gets 35 inches of rain per year. The US average is 37. Snowfall is 30 inches. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 114.

On average, there are 197 sunny days per year in Chicago-Naperville-Joliet Metro Area, IL. The July high is around 84 degrees. The January low is 15. Our comfort index, which is based on humidity during the hot months, is a 46 out of 100, where higher is more comfortable. The US average on the comfort index is 44.

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