2025 Compare Climate & Weather:
Marion, IL vs Glen Ellyn, IL

Highlights

On average, there are 191 sunny days per year in Glen Ellyn. Marion averages 208 sunny days per year. The US average is 205 sunny days.

Glen Ellyn, Illinois gets 38.6 inches of rain, on average, per year. Marion, Illinois gets 46.5 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. Marion averages 12 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

Marion, Illinois
Summer High: the July high is around 87.6 degrees
Winter Low: the January low is 22.8
Rain: averages 46.5 inches of rain a year
Snow: averages 12 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 Marion is 7.2 (10=best), which means it is one of the most pleasant places in Illinois.

Today's Weather - Marion, IL

71°F

Today's Weather - Glen Ellyn, IL

63°F

Average Monthly High / Low (°F)

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

July is the hottest month for Marion with an average high temperature of 87.6°, which ranks it as warmer than most places in Illinois. In Marion, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Marion are September, May and June.

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.

January has the coldest nighttime temperatures for Marion with an average of 22.8°. This is one of the warmest places in Illinois.

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

In Marion, there are 29.0 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

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 Marion, there are 100.5 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

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 Marion, there are 1.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

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 Marion with 5.4 inches of rain, and the driest month is September with 2.9 inches. The wettest season is Summer with 30% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 46.5 inches in Marion means that it is one of the wettest places in Illinois.


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 Marion with 10.9 days of rain, and September is the driest month with only 6.9 rainy days. There are 103.9 rainy days annually in Marion, which is less rainy than most places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Winter with only a 23% 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 12.0 inches in Marion means that it is less snowy than most places in Illinois.

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

February is the snowiest month in Marion with 4.1 inches of snow, and 4 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.