Oak Brook, IL Climate


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United States / Illinois / Chicago-Naperville-Elgin Metro Area / DuPage County / Oak Brook / Zip Codes
Oak Brook, IL has a humid continental climate, characterized by warm summers and cold winters. The average temperatures in the summer range from highs of 81°F during the day to lows of 57°F at night. In the winter, temperatures usually stay between 32°F during the day and 18°F at night. Oak Brook gets an average of 43 inches of precipitation per year, with most rain falling in April and May and snow falling from November through March. The area also experiences moderate humidity all year round.

Oak Brook, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Oak Brook averages 31 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 188 sunny days per year in Oak Brook. The US average is 205 sunny days.

Oak Brook gets some kind of precipitation, on average, 121 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 84 degrees
Winter Low: the January low is 15
Rain: averages 39 inches of rain a year
Snow: averages 31 inches of snow a year

Bestplaces Comfort Index

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

9 Summer - 4.5 Winter
June, September and August are the most pleasant months in Oak Brook, while January and December are the least comfortable months.

  ClimateOak Brook, IllinoisUnited States
  38.7 in.38.1 in.
  31.1 in.27.8 in.
  120.5 days106.2 days
  188 days205 days
  83.9°85.8°
  15.3°21.7°
  6.97
  3.44.3
  663 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 Oak Brook with an average high temperature of 83.9°, which ranks it as cooler than most places in Illinois. In Oak Brook, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Oak Brook are June, September and August.
In Oak Brook, there are 9.2 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 Oak Brook with an average of 15.3°. This is colder than most places in Illinois.
In Oak Brook, there are 135.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.
In Oak Brook, there are 5.9 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.
The humidity is usually comfortable in Oak Brook 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 Oak Brook with 4.3 inches of rain, and the driest month is January with 1.9 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 38.7 inches in Oak Brook means that it is about average compared to other places in Illinois.
May is the rainiest month in Oak Brook with 11.8 days of rain, and February is the driest month with only 8.2 rainy days. There are 120.5 rainy days annually in Oak Brook, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 27% of the time and the driest is Winter with only a 23% chance of a rainy day.
An annual snowfall of 31.1 inches in Oak Brook means that it is snowier than most places in Illinois. January is the snowiest month in Oak Brook with 10.2 inches of snow, and 6 months of the year have significant snowfall.
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