2025 Compare Climate & Weather:
Arvada, CO vs Glen Ellyn, IL

Highlights

On average, there are 191 sunny days per year in Glen Ellyn. Arvada averages 246 sunny days per year. The US average is 205 sunny days.

Glen Ellyn, Illinois gets 38.6 inches of rain, on average, per year. Arvada, Colorado gets 16.8 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Glen Ellyn averages 32.6 inches of snow per year. Arvada averages 61 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Glen Ellyn, Illinois
Summer High: the July high is around 84.2 degrees
Winter Low: the January low is 15
Rain: averages 38.6 inches of rain a year
Snow: averages 32.6 inches of snow a year

Arvada, Colorado
Summer High: the July high is around 89.5 degrees
Winter Low: the January low is 18
Rain: averages 16.8 inches of rain a year
Snow: averages 61 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Arvada is 7.3 (10=best), which means it is more comfortable than most places in Colorado.

Today's Weather - Arvada, CO

41°F

Today's Weather - Glen Ellyn, IL

53°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Arvada / Glen Ellyn

July is the hottest month for Arvada with an average high temperature of 89.5°, which ranks it as warmer than most places in Colorado. In Arvada, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Arvada are September, June and May.

July is the hottest month for Glen Ellyn with an average high temperature of 84.2°, which ranks it as cooler than most places in Illinois. In Glen Ellyn, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Glen Ellyn are June, September and August.

December has the coldest nighttime temperatures for Arvada with an average of 17.3°. This is warmer than most places in Colorado.

January has the coldest nighttime temperatures for Glen Ellyn with an average of 15.0°. This is colder than most places in Illinois.

In Arvada, there are 40.0 days annually when the high temperature is over 90°, which is hotter than most places in Colorado.

In Glen Ellyn, there are 9.3 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Arvada, there are 155.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Colorado.

In Glen Ellyn, there are 138.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Arvada, there are 5.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Colorado.

In Glen Ellyn, there are 5.7 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 Arvada with 2.4 inches of rain, and the driest month is January with 0.5 inches. The wettest season is Summer with 36% of yearly precipitation and 10% occurs in Spring, which is the driest season. The annual rainfall of 16.8 inches in Arvada means that it is about average compared to other places in Colorado.


August is the wettest month in Glen Ellyn with 4.2 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 38.6 inches in Glen Ellyn means that it is about average compared to other places in Illinois.

May is the rainiest month in Arvada with 9.7 days of rain, and January is the driest month with only 4.3 rainy days. There are 80.6 rainy days annually in Arvada, which is about average compared to other places in Colorado. The rainiest season is Autumn when it rains 31% of the time and the driest is Spring with only a 17% chance of a rainy day.

May is the rainiest month in Glen Ellyn with 11.9 days of rain, and September is the driest month with only 8.0 rainy days. There are 121.6 rainy days annually in Glen Ellyn, 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.

An annual snowfall of 61.0 inches in Arvada means that it is about average compared to other places in Colorado.

An annual snowfall of 32.6 inches in Glen Ellyn means that it is snowier than most places in Illinois.

March is the snowiest month in Arvada with 11.9 inches of snow, and 9 months of the year have significant snowfall.

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