2025 Compare Climate & Weather:
Lemont, IL vs Wentzville, MO

Highlights

On average, there are 205 sunny days per year in Wentzville. Lemont averages 187 sunny days per year. The US average is 205 sunny days.

Wentzville, Missouri gets 42.5 inches of rain, on average, per year. Lemont, Illinois gets 39.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Wentzville averages 13.4 inches of snow per year. Lemont averages 29.9 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Wentzville, Missouri
Summer High: the July high is around 88.1 degrees
Winter Low: the January low is 20.8
Rain: averages 42.5 inches of rain a year
Snow: averages 13.4 inches of snow a year

Lemont, Illinois
Summer High: the July high is around 83.9 degrees
Winter Low: the January low is 15.1
Rain: averages 39.4 inches of rain a year
Snow: averages 29.9 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Wentzville is 7.2 (10=best), which means it is more comfortable than most places in Missouri.

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

Today's Weather - Lemont, IL

70°F

Today's Weather - Wentzville, MO

67°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Lemont / Wentzville

July is the hottest month for Lemont with an average high temperature of 83.9°, which ranks it as cooler than most places in Illinois. In Lemont, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lemont are June, September and August.

July is the hottest month for Wentzville with an average high temperature of 88.1°, which ranks it as about average compared to other places in Missouri. In Wentzville, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Wentzville are September, May and June.

January has the coldest nighttime temperatures for Lemont with an average of 15.1°. This is colder than most places in Illinois.

January has the coldest nighttime temperatures for Wentzville with an average of 20.8°. This is about average compared to other places in Missouri.

In Lemont, there are 8.2 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In Wentzville, there are 33.4 days annually when the high temperature is over 90°, which is about average compared to other places in Missouri.

In Lemont, there are 135.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Wentzville, there are 103.9 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Missouri.

In Lemont, there are 5.9 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

In Wentzville, there are 3.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Missouri.

August is the wettest month in Lemont with 4.3 inches of rain, and the driest month is February with 1.8 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 39.4 inches in Lemont means that it is about average compared to other places in Illinois.


May is the wettest month in Wentzville with 4.8 inches of rain, and the driest month is January with 2.3 inches. The wettest season is Summer with 29% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 42.5 inches in Wentzville means that it is drier than most places in Missouri.

May is the rainiest month in Lemont with 12.3 days of rain, and September is the driest month with only 8.0 rainy days. There are 120.7 rainy days annually in Lemont, 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 22% chance of a rainy day.

May is the rainiest month in Wentzville with 11.9 days of rain, and January is the driest month with only 7.4 rainy days. There are 109.6 rainy days annually in Wentzville, which is one of the rainiest places in Missouri. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 22% chance of a rainy day.

An annual snowfall of 29.9 inches in Lemont means that it is snowier than most places in Illinois.

An annual snowfall of 13.4 inches in Wentzville means that it is about average compared to other places in Missouri.

January is the snowiest month in Lemont with 10.2 inches of snow, and 6 months of the year have significant snowfall.

February is the snowiest month in Wentzville with 4.5 inches of snow, and 5 months of the year have significant snowfall.