2025 Compare Climate & Weather:
Fort Collins, CO vs Belleville, IL

Highlights

On average, there are 203 sunny days per year in Belleville. Fort Collins averages 237 sunny days per year. The US average is 205 sunny days.

Belleville, Illinois gets 42.3 inches of rain, on average, per year. Fort Collins, Colorado gets 15.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Belleville averages 12.7 inches of snow per year. Fort Collins averages 48.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Belleville, Illinois
Summer High: the July high is around 89.1 degrees
Winter Low: the January low is 22.2
Rain: averages 42.3 inches of rain a year
Snow: averages 12.7 inches of snow a year

Fort Collins, Colorado
Summer High: the July high is around 87 degrees
Winter Low: the January low is 15.3
Rain: averages 15.6 inches of rain a year
Snow: averages 48.1 inches of snow a year

BestPlaces Comfort Index

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

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

Today's Weather - Fort Collins, CO

42°F

Today's Weather - Belleville, IL

53°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Fort Collins / Belleville

July is the hottest month for Fort Collins with an average high temperature of 87.0°, which ranks it as about average compared to other places in Colorado. In Fort Collins, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Fort Collins are September, June and August.

July is the hottest month for Belleville with an average high temperature of 89.1°, which ranks it as one of the hottest places in Illinois. In Belleville, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Belleville are May, September and June.

December has the coldest nighttime temperatures for Fort Collins with an average of 14.9°. This is about average compared to other places in Colorado.

January has the coldest nighttime temperatures for Belleville with an average of 22.2°. This is warmer than most places in Illinois.

In Fort Collins, there are 23.6 days annually when the high temperature is over 90°, which is about average compared to other places in Colorado.

In Belleville, there are 39.3 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

In Fort Collins, there are 163.6 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Colorado.

In Belleville, there are 100.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Fort Collins, there are 7.1 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Colorado.

In Belleville, there are 1.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.

May is the wettest month in Fort Collins with 2.4 inches of rain, and the driest month is January with 0.4 inches. The wettest season is Summer with 39% of yearly precipitation and 8% occurs in Spring, which is the driest season. The annual rainfall of 15.6 inches in Fort Collins means that it is drier than most places in Colorado.


May is the wettest month in Belleville with 4.8 inches of rain, and the driest month is February 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 42.3 inches in Belleville means that it is wetter than most places in Illinois.

May is the rainiest month in Fort Collins with 11.2 days of rain, and December is the driest month with only 4.5 rainy days. There are 89.8 rainy days annually in Fort Collins, which is rainier than most places in Colorado. The rainiest season is Autumn when it rains 31% of the time and the driest is Spring with only a 16% chance of a rainy day.

May is the rainiest month in Belleville with 11.1 days of rain, and September is the driest month with only 6.6 rainy days. There are 101.0 rainy days annually in Belleville, 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.

An annual snowfall of 48.1 inches in Fort Collins means that it is about average compared to other places in Colorado.

An annual snowfall of 12.7 inches in Belleville means that it is less snowy than most places in Illinois.

March is the snowiest month in Fort Collins with 10.9 inches of snow, and 9 months of the year have significant snowfall.

January is the snowiest month in Belleville with 4.1 inches of snow, and 4 months of the year have significant snowfall.