Cook County, Illinois gets 38 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Cook County averages 34 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 189 sunny days per year in Cook County. The US average is 205 sunny days.
Cook County gets some kind of precipitation, on average, 124 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.
Summer High: the July high is around 84 degrees
Winter Low: the January low is 18
Rain: averages 38 inches of rain a year
Snow: averages 34 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for Cook County is 6.9 (10=best), which means it is less comfortable than most places in Illinois.
9 / 4.6
Summer / Winter
June, September and August are the most pleasant months in Cook County, while January and December are the least comfortable months.