DeKalb, IL Climate


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United States / Illinois / Chicago-Naperville-Elgin Metro Area / DeKalb County / DeKalb / Zip Codes
DeKalb, IL has a humid continental climate with hot summers and cold winters. During the summer months, temperatures can reach up to the mid 90s with high humidity. Winters in DeKalb are generally cold and snowy, with temperatures dropping into the teens and twenties. The average yearly snowfall is approximately 45 inches, making it a great place for winter activities such as skiing. Precipitation is evenly distributed throughout the year, averaging around 41 inches annually.

DeKalb, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.

DeKalb averages 29 inches of snow per year. The US average is 28 inches of snow per year.

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

DeKalb gets some kind of precipitation, on average, 116 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 Highlights

Summer High: the July high is around 83 degrees
Winter Low: the January low is 12
Rain: averages 37 inches of rain a year
Snow: averages 29 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.

8.9 Summer - 4.3 Winter
June, September and August are the most pleasant months in DeKalb, while January and December are the least comfortable months.

  ClimateDeKalb, IllinoisUnited States
  37.2 in.38.1 in.
  28.6 in.27.8 in.
  115.5 days106.2 days
  195 days205 days
  82.6°85.8°
  12.2°21.7°
  6.87
  3.54.3
  879 ft.2443 ft.
Climate
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 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.
In DeKalb, there are 8.3 days annually when the high temperature is over 90°, which is one of the coolest 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 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 DeKalb, there are 13.1 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.
The humidity is usually comfortable in DeKalb but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.
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 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 28.6 inches in DeKalb means that it is snowier than most places in Illinois. January is the snowiest month in DeKalb with 9.7 inches of snow, and 6 months of the year have significant snowfall.
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Bonnie · DeKalb, IL
Not as good as it seems
Over 16 years ago

While I love the cheaper rents then in the closer suburbs (to Chicago), the lack of high paying jobs for anyone without high degrees (Masters or higher) is  More

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Steve · DeKalb, IL
DeKalb: A semi-rural college community
Over 17 years ago

As a 37 year resident of DeKalb - an escapee of the Chicago suburbs, I am pleased to write a bit about my hometown. Originally a college town in a farming community,  More

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