2025 Compare Climate & Weather:
Troy, IL vs Lemont, IL

Highlights

On average, there are 187 sunny days per year in Lemont. Troy averages 204 sunny days per year. The US average is 205 sunny days.

Lemont, Illinois gets 39.4 inches of rain, on average, per year. Troy, Illinois gets 43.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Lemont averages 29.9 inches of snow per year. Troy averages 11.6 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Troy, Illinois
Summer High: the July high is around 89.3 degrees
Winter Low: the January low is 22.1
Rain: averages 43.7 inches of rain a year
Snow: averages 11.6 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Troy is 7.2 (10=best), which means it is one of the most pleasant places in Illinois.

Today's Weather - Troy, IL

73°F

Today's Weather - Lemont, IL

76°F

Average Monthly High / Low (°F)

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

July is the hottest month for Troy with an average high temperature of 89.3°, which ranks it as one of the hottest places in Illinois. In Troy, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Troy are May, September and June.

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.

January has the coldest nighttime temperatures for Troy with an average of 22.1°. This is warmer than most places in Illinois.

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

In Troy, there are 39.9 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

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 Troy, there are 96.6 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.

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 Troy, there are 2.0 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

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.

May is the wettest month in Troy with 4.9 inches of rain, and the driest month is January with 2.5 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 43.7 inches in Troy means that it is wetter than most places in Illinois.


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 rainiest month in Troy with 10.9 days of rain, and February is the driest month with only 6.6 rainy days. There are 96.6 rainy days annually in Troy, 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 Spring with only a 22% chance of a rainy day.

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.

An annual snowfall of 11.6 inches in Troy means that it is less snowy than most places in Illinois.

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

January is the snowiest month in Troy with 3.8 inches of snow, and 4 months of the year have significant snowfall.

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