2025 Compare Climate & Weather:
Marengo, IL vs Jacksonville, IL

Highlights

On average, there are 197 sunny days per year in Jacksonville. Marengo averages 191 sunny days per year. The US average is 205 sunny days.

Jacksonville, Illinois gets 39.9 inches of rain, on average, per year. Marengo, Illinois gets 36.5 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Jacksonville averages 18 inches of snow per year. Marengo averages 33.8 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Jacksonville, Illinois
Summer High: the July high is around 87.2 degrees
Winter Low: the January low is 17.7
Rain: averages 39.9 inches of rain a year
Snow: averages 18 inches of snow a year

Marengo, Illinois
Summer High: the July high is around 83.1 degrees
Winter Low: the January low is 12.3
Rain: averages 36.5 inches of rain a year
Snow: averages 33.8 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Jacksonville is 7.1 (10=best), which means it is more comfortable than most places in Illinois.

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

Today's Weather - Marengo, IL

64°F

Today's Weather - Jacksonville, IL

68°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Marengo / Jacksonville

July is the hottest month for Marengo with an average high temperature of 83.1°, which ranks it as one of the coolest places in Illinois. In Marengo, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Marengo are June, September and August.

July is the hottest month for Jacksonville with an average high temperature of 87.2°, which ranks it as warmer than most places in Illinois. In Jacksonville, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Jacksonville are September, May and June.

January has the coldest nighttime temperatures for Marengo with an average of 12.3°. This is one of the coldest places in Illinois.

January has the coldest nighttime temperatures for Jacksonville with an average of 17.7°. This is about average compared to other places in Illinois.

In Marengo, there are 11.1 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Jacksonville, there are 24.9 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

In Marengo, there are 140.8 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

In Jacksonville, there are 121.9 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Marengo, there are 13.0 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.

In Jacksonville, there are 4.8 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

August is the wettest month in Marengo with 4.8 inches of rain, and the driest month is January with 1.4 inches. The wettest season is Autumn with 36% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 36.5 inches in Marengo means that it is one of the driest places in Illinois.


May is the wettest month in Jacksonville with 4.6 inches of rain, and the driest month is January with 1.8 inches. The wettest season is Autumn with 30% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 39.9 inches in Jacksonville means that it is wetter than most places in Illinois.

May is the rainiest month in Marengo with 11.5 days of rain, and February is the driest month with only 7.3 rainy days. There are 111.8 rainy days annually in Marengo, which is rainier than most 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.

May is the rainiest month in Jacksonville with 11.7 days of rain, and February is the driest month with only 6.6 rainy days. There are 107.7 rainy days annually in Jacksonville, which is about average compared to other places in Illinois. The rainiest season is Summer when it rains 31% of the time and the driest is Spring with only a 20% chance of a rainy day.

An annual snowfall of 33.8 inches in Marengo means that it is snowier than most places in Illinois.

An annual snowfall of 18.0 inches in Jacksonville means that it is about average compared to other places in Illinois.

December is the snowiest month in Marengo with 9.7 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Jacksonville with 5.5 inches of snow, and 4 months of the year have significant snowfall.