2025 Compare Climate & Weather:
Wheaton, IL vs Seattle, WA

Highlights

On average, there are 152 sunny days per year in Seattle. Wheaton averages 186 sunny days per year. The US average is 205 sunny days.

Seattle, Washington gets 38 inches of rain, on average, per year. Wheaton, Illinois gets 38.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Seattle averages 4.6 inches of snow per year. Wheaton averages 29.8 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Seattle, Washington
Summer High: the July high is around 75.8 degrees
Winter Low: the January low is 37
Rain: averages 38 inches of rain a year
Snow: averages 4.6 inches of snow a year

Wheaton, 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 29.8 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Seattle is 7.5 (10=best), which means it is one of the most pleasant places in Washington.

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

Today's Weather - Wheaton, IL

58°F

Today's Weather - Seattle, WA

66°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Wheaton / Seattle

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

August is the hottest month for Seattle with an average high temperature of 76.3°, which ranks it as cooler than most places in Washington. In Seattle, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Seattle are August, July and September.

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

December has the coldest nighttime temperatures for Seattle with an average of 35.9°. This is one of the warmest places in Washington.

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

In Seattle, there are 1.7 days annually when the high temperature is over 90°, which is cooler than most places in Washington.

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

In Seattle, there are 24.0 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Washington.

In Wheaton, there are 5.7 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

In Seattle, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.

August is the wettest month in Wheaton 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 Wheaton means that it is about average compared to other places in Illinois.


November is the wettest month in Seattle with 6.2 inches of rain, and the driest month is July with 0.8 inches. The wettest season is Spring with 39% of yearly precipitation and 9% occurs in Autumn, which is the driest season. The annual rainfall of 38.0 inches in Seattle means that it is about average compared to other places in Washington.

May is the rainiest month in Wheaton with 11.9 days of rain, and September is the driest month with only 8.0 rainy days. There are 119.2 rainy days annually in Wheaton, 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.

November is the rainiest month in Seattle with 18.7 days of rain, and August is the driest month with only 5.3 rainy days. There are 155.3 rainy days annually in Seattle, which is about average compared to other places in Washington. The rainiest season is Spring when it rains 33% of the time and the driest is Autumn with only a 13% chance of a rainy day.

An annual snowfall of 29.8 inches in Wheaton means that it is snowier than most places in Illinois.

An annual snowfall of 4.6 inches in Seattle means that it is about average compared to other places in Washington.

January is the snowiest month in Wheaton with 9.8 inches of snow, and 6 months of the year have significant snowfall.

December is the snowiest month in Seattle with 2.1 inches of snow, and 4 months of the year have significant snowfall.