2025 Compare Climate & Weather:
Grayslake, IL vs Champaign, IL

Highlights

On average, there are 194 sunny days per year in Champaign. Grayslake averages 192 sunny days per year. The US average is 205 sunny days.

Champaign, Illinois gets 40.7 inches of rain, on average, per year. Grayslake, Illinois gets 36.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Champaign averages 20.3 inches of snow per year. Grayslake averages 43.2 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Champaign, Illinois
Summer High: the July high is around 84.4 degrees
Winter Low: the January low is 16.6
Rain: averages 40.7 inches of rain a year
Snow: averages 20.3 inches of snow a year

Grayslake, Illinois
Summer High: the July high is around 82.1 degrees
Winter Low: the January low is 14.3
Rain: averages 36.2 inches of rain a year
Snow: averages 43.2 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Champaign is 7.1 (10=best), which means it is more comfortable than most places in Illinois.

The annual BestPlaces Comfort Index for Grayslake is 6.8 (10=best), which means it is less comfortable than most places in Illinois.

Today's Weather - Grayslake, IL

45°F

Today's Weather - Champaign, IL

58°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Grayslake / Champaign

July is the hottest month for Grayslake with an average high temperature of 82.1°, which ranks it as one of the coolest places in Illinois. In Grayslake, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Grayslake are June, August and July.

July is the hottest month for Champaign with an average high temperature of 84.4°, which ranks it as cooler than most places in Illinois. In Champaign, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Champaign are September, May and June.

January has the coldest nighttime temperatures for Grayslake with an average of 14.3°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Champaign with an average of 16.6°. This is about average compared to other places in Illinois.

In Grayslake, there are 8.5 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Champaign, there are 15.1 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Grayslake, there are 132.1 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Champaign, there are 124.1 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Grayslake, there are 9.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

In Champaign, there are 6.5 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

May is the wettest month in Grayslake with 4.0 inches of rain, and the driest month is January with 1.8 inches. The wettest season is Autumn with 31% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 36.2 inches in Grayslake means that it is one of the driest places in Illinois.


July is the wettest month in Champaign with 4.7 inches of rain, and the driest month is January with 2.0 inches. The wettest season is Autumn with 31% of yearly precipitation and 17% occurs in Spring, which is the driest season. The annual rainfall of 40.7 inches in Champaign means that it is wetter than most places in Illinois.

May is the rainiest month in Grayslake with 12.2 days of rain, and February is the driest month with only 8.4 rainy days. There are 120.1 rainy days annually in Grayslake, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.

May is the rainiest month in Champaign with 11.5 days of rain, and September is the driest month with only 7.1 rainy days. There are 111.0 rainy days annually in Champaign, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 29% of the time and the driest is Winter with only a 23% chance of a rainy day.

An annual snowfall of 43.2 inches in Grayslake means that it is one of the snowiest places in Illinois.

An annual snowfall of 20.3 inches in Champaign means that it is about average compared to other places in Illinois.

January is the snowiest month in Grayslake with 12.9 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Champaign with 5.9 inches of snow, and 5 months of the year have significant snowfall.