Cook County, Illinois 

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Weather in Cook County, Illinois

The most pleasant months of the year for Cook County are June, September and August. In Cook County, there are 4 comfortable months with high temperatures in the range of 70-85°. 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. January is the snowiest month in Cook County with 10.8 inches of snow, and 6 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.


Today's Weather - Cook, IL

10 PM PST

Slight Chance Rain Showers then Partly Cloudy

54°F

7 DAY FORECASTDESCRIPTIONHIGH/LOWWIND
TonightSlight Chance Rain Showers then Partly Cloudy45° / 59°WNW 10 to 15 mph
Saturday NightClear46° / 65°W 10 to 15 mph
Sunday NightClear50° / 69°W 5 to 10 mph
Monday NightMostly Clear54° / 71°SSW 5 to 10 mph
Tuesday NightPartly Cloudy56° / 70°SSW 10 mph
Wednesday NightChance Rain Showers56° / 63°SW 10 mph
Thursday NightChance Rain Showers51° / 58°NW 10 mph

Weather Highlights

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 the Cook County area is 9 (10=best), which means it is more comfortable than most places in Illinois.

9 / 10

A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 7.8. 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.


Average Monthly High and Low (°F)
HighLow
January32° 18°
February36° 21°
March47° 30°
April59° 40°
May70° 50°
June79° 60°
July84° 66°
August82° 65°
September75° 57°
October63° 45°
November49° 34°
December36° 22°
Hot, Freezing, Rainy, Snowy Days: Cook
Hot
Days
Freezing
Days
Rainy
Days
Snowy
Days
January027107
February02485
March018113
April05121
May10120
June30100
July60100
August40100
September1090
October02100
November012111
December025116

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.


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MAPS OF COOK COUNTY, ILLINOIS
ZIP CODES IN COOK COUNTY, ILLINOIS
60629, 60618, 60632, 60639, 60623, 60647, 60617, 60804, 60625, 60608, ... 164 more


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