2025 Compare Climate & Weather:
Blue Island, IL vs Carbondale, IL

Highlights

On average, there are 216 sunny days per year in Carbondale. Blue Island averages 189 sunny days per year. The US average is 205 sunny days.

Carbondale, Illinois gets 45.6 inches of rain, on average, per year. Blue Island, Illinois gets 37.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Carbondale averages 10.3 inches of snow per year. Blue Island averages 31.6 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Carbondale, Illinois
Summer High: the July high is around 88.6 degrees
Winter Low: the January low is 23.8
Rain: averages 45.6 inches of rain a year
Snow: averages 10.3 inches of snow a year

Blue Island, Illinois
Summer High: the July high is around 84.2 degrees
Winter Low: the January low is 18.3
Rain: averages 37.9 inches of rain a year
Snow: averages 31.6 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Blue Island is 7.0 (10=best), which means it is about average compared to other places in Illinois.

Today's Weather - Blue Island, IL

64°F

Today's Weather - Carbondale, IL

70°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Blue Island / Carbondale

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

July is the hottest month for Carbondale with an average high temperature of 88.6°, which ranks it as one of the hottest places in Illinois. In Carbondale, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Carbondale are May, September and June.

January has the coldest nighttime temperatures for Blue Island with an average of 18.3°. This is warmer than most places in Illinois.

January has the coldest nighttime temperatures for Carbondale with an average of 23.8°. This is one of the warmest places in Illinois.

In Blue Island, there are 15.4 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Carbondale, there are 35.1 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

In Blue Island, there are 107.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Carbondale, there are 94.6 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.

In Blue Island, 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 Carbondale, there are 1.4 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.

July is the wettest month in Blue Island with 4.1 inches of rain, and the driest month is February with 1.9 inches. The wettest season is Autumn with 31% of yearly precipitation and 17% occurs in Spring, which is the driest season. The annual rainfall of 37.9 inches in Blue Island means that it is drier than most places in Illinois.


May is the wettest month in Carbondale with 5.3 inches of rain, and the driest month is February with 2.8 inches. The wettest season is Summer with 30% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 45.6 inches in Carbondale means that it is one of the wettest places in Illinois.

May is the rainiest month in Blue Island with 11.7 days of rain, and February is the driest month with only 8.3 rainy days. There are 124.4 rainy days annually in Blue Island, which is one of the rainiest places in Illinois. The rainiest season is Summer when it rains 27% of the time and the driest is Spring with only a 24% chance of a rainy day.

May is the rainiest month in Carbondale with 11.3 days of rain, and September is the driest month with only 6.6 rainy days. There are 102.3 rainy days annually in Carbondale, 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 Winter with only a 22% chance of a rainy day.

An annual snowfall of 31.6 inches in Blue Island means that it is snowier than most places in Illinois.

An annual snowfall of 10.3 inches in Carbondale means that it is one of the least snowy places in Illinois.

January is the snowiest month in Blue Island with 10.1 inches of snow, and 6 months of the year have significant snowfall.

December is the snowiest month in Carbondale with 3.2 inches of snow, and 4 months of the year have significant snowfall.