2025 Compare Climate & Weather:
Mount Prospect, IL vs Chattanooga, TN

Highlights

On average, there are 207 sunny days per year in Chattanooga. Mount Prospect averages 186 sunny days per year. The US average is 205 sunny days.

Chattanooga, Tennessee gets 51.1 inches of rain, on average, per year. Mount Prospect, Illinois gets 36 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Chattanooga averages 1.5 inches of snow per year. Mount Prospect averages 36 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Chattanooga, Tennessee
Summer High: the July high is around 89 degrees
Winter Low: the January low is 28.9
Rain: averages 51.1 inches of rain a year
Snow: averages 1.5 inches of snow a year

Mount Prospect, Illinois
Summer High: the July high is around 83.6 degrees
Winter Low: the January low is 16.9
Rain: averages 36 inches of rain a year
Snow: averages 36 inches of snow a year

BestPlaces Comfort Index

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

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

Today's Weather - Mount Prospect, IL

75°F

Today's Weather - Chattanooga, TN

76°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Mount Prospect / Chattanooga

July is the hottest month for Mount Prospect with an average high temperature of 83.6°, which ranks it as cooler than most places in Illinois. In Mount Prospect, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mount Prospect are June, September and August.

July is the hottest month for Chattanooga with an average high temperature of 89.0°, which ranks it as warmer than most places in Tennessee. In Chattanooga, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chattanooga are May, September and October.

January has the coldest nighttime temperatures for Mount Prospect with an average of 16.9°. This is about average compared to other places in Illinois.

January has the coldest nighttime temperatures for Chattanooga with an average of 28.9°. This is one of the warmest places in Tennessee.

In Mount Prospect, there are 14.0 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Chattanooga, there are 39.0 days annually when the high temperature is over 90°, which is hotter than most places in Tennessee.

In Mount Prospect, there are 121.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Chattanooga, there are 71.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Tennessee.

In Mount Prospect, there are 6.1 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

In Chattanooga, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Tennessee.

August is the wettest month in Mount Prospect with 4.4 inches of rain, and the driest month is February with 1.6 inches. The wettest season is Autumn with 33% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 36.0 inches in Mount Prospect means that it is one of the driest places in Illinois.


December is the wettest month in Chattanooga with 4.9 inches of rain, and the driest month is October with 3.2 inches. The wettest season is Spring with 29% of yearly precipitation and 23% occurs in Autumn, which is the driest season. The annual rainfall of 51.1 inches in Chattanooga means that it is drier than most places in Tennessee.

April is the rainiest month in Mount Prospect with 12.2 days of rain, and February is the driest month with only 8.3 rainy days. There are 125.3 rainy days annually in Mount Prospect, 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 Spring with only a 23% chance of a rainy day.

December is the rainiest month in Chattanooga with 9.2 days of rain, and October is the driest month with only 6.3 rainy days. There are 99.0 rainy days annually in Chattanooga, which is one of the least rainy places in Tennessee. The rainiest season is Spring when it rains 28% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 36.0 inches in Mount Prospect means that it is one of the snowiest places in Illinois.

An annual snowfall of 1.5 inches in Chattanooga means that it is one of the least snowy places in Tennessee.

January is the snowiest month in Mount Prospect with 11.3 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Chattanooga with 0.6 inches of snow, and 1 month of the year have significant snowfall.