2025 Compare Climate & Weather:
Addison, IL vs DeKalb, IL

Highlights

On average, there are 195 sunny days per year in DeKalb. Addison averages 188 sunny days per year. The US average is 205 sunny days.

DeKalb, Illinois gets 37.2 inches of rain, on average, per year. Addison, Illinois gets 38.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

DeKalb averages 28.6 inches of snow per year. Addison averages 32.9 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

DeKalb, Illinois
Summer High: the July high is around 82.6 degrees
Winter Low: the January low is 12.2
Rain: averages 37.2 inches of rain a year
Snow: averages 28.6 inches of snow a year

Addison, Illinois
Summer High: the July high is around 83.9 degrees
Winter Low: the January low is 15.3
Rain: averages 38.2 inches of rain a year
Snow: averages 32.9 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Addison is 6.9 (10=best), which means it is less comfortable than most places in Illinois.

Today's Weather - Addison, IL

66°F

Today's Weather - DeKalb, IL

79°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Addison / DeKalb

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

July is the hottest month for DeKalb with an average high temperature of 82.6°, which ranks it as one of the coolest places in Illinois. In DeKalb, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for DeKalb are June, August and September.

January has the coldest nighttime temperatures for Addison with an average of 15.3°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for DeKalb with an average of 12.2°. This is one of the coldest places in Illinois.

In Addison, there are 9.5 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In DeKalb, there are 8.3 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Addison, there are 135.1 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In DeKalb, there are 142.2 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

In Addison, there are 5.9 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

In DeKalb, there are 13.1 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.

August is the wettest month in Addison with 4.5 inches of rain, and the driest month is January 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 38.2 inches in Addison means that it is drier than most places in Illinois.


August is the wettest month in DeKalb with 4.7 inches of rain, and the driest month is January with 1.5 inches. The wettest season is Autumn with 36% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 37.2 inches in DeKalb means that it is drier than most places in Illinois.

May is the rainiest month in Addison with 11.9 days of rain, and September is the driest month with only 8.0 rainy days. There are 121.9 rainy days annually in Addison, which is one of the rainiest 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 DeKalb with 11.8 days of rain, and February is the driest month with only 7.9 rainy days. There are 115.5 rainy days annually in DeKalb, 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.

An annual snowfall of 32.9 inches in Addison means that it is snowier than most places in Illinois.

An annual snowfall of 28.6 inches in DeKalb means that it is snowier than most places in Illinois.

January is the snowiest month in Addison with 10.7 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in DeKalb with 9.7 inches of snow, and 6 months of the year have significant snowfall.