2025 Compare Climate & Weather:
Rockford, IL vs Mattoon, IL

Highlights

On average, there are 201 sunny days per year in Mattoon. Rockford averages 188 sunny days per year. The US average is 205 sunny days.

Mattoon, Illinois gets 39.5 inches of rain, on average, per year. Rockford, Illinois gets 37.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Mattoon averages 15.7 inches of snow per year. Rockford averages 35.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Mattoon, Illinois
Summer High: the July high is around 86 degrees
Winter Low: the January low is 20.1
Rain: averages 39.5 inches of rain a year
Snow: averages 15.7 inches of snow a year

Rockford, Illinois
Summer High: the July high is around 83.7 degrees
Winter Low: the January low is 12.7
Rain: averages 37.1 inches of rain a year
Snow: averages 35.1 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Rockford is 6.8 (10=best), which means it is less comfortable than most places in Illinois.

Today's Weather - Rockford, IL

47°F

Today's Weather - Mattoon, IL

46°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Rockford / Mattoon

July is the hottest month for Rockford with an average high temperature of 83.7°, which ranks it as cooler than most places in Illinois. In Rockford, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rockford are June, September and August.

July is the hottest month for Mattoon with an average high temperature of 86.0°, which ranks it as about average compared to other places in Illinois. In Mattoon, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mattoon are September, May and June.

January has the coldest nighttime temperatures for Rockford with an average of 12.7°. This is one of the coldest places in Illinois.

January has the coldest nighttime temperatures for Mattoon with an average of 20.1°. This is warmer than most places in Illinois.

In Rockford, there are 12.1 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Mattoon, there are 19.3 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.

In Rockford, there are 138.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Mattoon, there are 104.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Rockford, there are 12.9 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.

In Mattoon, there are 3.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

June is the wettest month in Rockford with 4.9 inches of rain, and the driest month is January with 1.4 inches. The wettest season is Autumn with 37% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 37.1 inches in Rockford means that it is drier than most places in Illinois.


May is the wettest month in Mattoon with 4.3 inches of rain, and the driest month is February with 2.0 inches. The wettest season is Autumn with 29% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 39.5 inches in Mattoon means that it is about average compared to other places in Illinois.

May is the rainiest month in Rockford with 12.0 days of rain, and February is the driest month with only 8.0 rainy days. There are 116.0 rainy days annually in Rockford, 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.

May is the rainiest month in Mattoon with 11.8 days of rain, and September is the driest month with only 7.2 rainy days. There are 111.7 rainy days annually in Mattoon, which is rainier 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.

An annual snowfall of 35.1 inches in Rockford means that it is one of the snowiest places in Illinois.

An annual snowfall of 15.7 inches in Mattoon means that it is less snowy than most places in Illinois.

December is the snowiest month in Rockford with 11.4 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Mattoon with 5.9 inches of snow, and 5 months of the year have significant snowfall.