Climate in Cook County, Illinois

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.

Weather Highs & Lows

Summer High: the July high is around 84 degrees
Winter Low: the January low is 18

SPERLING'S COMFORT INDEX

Cook County ranks 45/100 for Comfort Index

A higher score indicates a more comfortable year-round 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.

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Cook County with an average high temperature of 83.9°, which ranks it as cooler than most places in Illinois. In Cook County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Cook County are June, September and August.

January has the coldest nighttime temperatures for Cook County with an average of 17.8°. This is about average compared to other places in Illinois.

In Cook County, there are 13.7 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Cook County, there are 113.3 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Cook County, there are 5.4 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

August is the wettest month in Cook County with 4.3 inches of rain, and the driest month is February with 1.8 inches. The wettest season is Autumn with 32% of yearly precipitation and 16% occurs in Spring, which is the driest season.

The annual rainfall of 38.1 inches in Cook County means that it is drier than most places in Illinois.

An annual snowfall of 34.0 inches in Cook County means that it is snowier than most places in Illinois.

January is the snowiest month in Cook County with 10.8 inches of snow, and 6 months of the year have significant snowfall.

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