Willowbrook, IL Climate

Willowbrook, IL has an overall temperate climate throughout the year. During the summer months, temperatures average in the mid to upper 80s with high humidity. The winters are chilly and snowy, with temperatures averaging in the low 20s. Precipitation is fairly consistent throughout the year, with occasional rain or snowfall during any given month. Overall, Willowbrook enjoys a moderate climate that is comfortable for most activities all year long.

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

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

On average, there are 192 sunny days per year in Willowbrook. The US average is 205 sunny days.

Willowbrook 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 16
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 Willowbrook is 6.9 (10=best), which means it is less comfortable than most places in Illinois.

8.9 Summer - 4.5 Winter

June, September and August are the most pleasant months in Willowbrook, while January and December are the least comfortable months.

Climate	Willowbrook, Illinois	United States
	39.1 in.	38.1 in.
	31.3 in.	27.8 in.
	120.5 days	106.2 days
	192 days	205 days
	83.9°	85.8°
	15.8°	21.7°
	6.9	7
	3.4	4.3
	732 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 Willowbrook with an average high temperature of 83.9°, which ranks it as cooler than most places in Illinois. In Willowbrook, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Willowbrook are June, September and August.

In Willowbrook, there are 9.6 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 Willowbrook with an average of 15.8°. This is colder than most places in Illinois.

In Willowbrook, there are 131.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Willowbrook, there are 5.3 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

The humidity is usually comfortable in Willowbrook 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 Willowbrook with 4.5 inches of rain, and the driest month is February with 1.9 inches. The wettest season is Autumn with 32% of yearly precipitation and 17% occurs in Spring, which is the driest season. The annual rainfall of 39.1 inches in Willowbrook means that it is about average compared to other places in Illinois.

May is the rainiest month in Willowbrook 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 Willowbrook, 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 31.3 inches in Willowbrook means that it is snowier than most places in Illinois. January is the snowiest month in Willowbrook with 10.4 inches of snow, and 6 months of the year have significant snowfall.