Climate in Madison County, Illinois

Madison County, Illinois gets 42 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Madison County averages 13 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 202 sunny days per year in Madison County. The US average is 205 sunny days.

Madison County gets some kind of precipitation, on average, 99 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 89 degrees
Winter Low: the January low is 22
Rain: averages 42 inches of rain a year
Snow: averages 13 inches of snow a year

BESTPLACES COMFORT INDEX

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

July is the hottest month for Madison County with an average high temperature of 88.7°, which ranks it as one of the hottest places in Illinois. In Madison County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Madison County are May, September and June.

In Madison County, there are 35.9 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

January has the coldest nighttime temperatures for Madison County with an average of 22.0°. This is warmer than most places in Illinois.

In Madison County, there are 94.5 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.

In Madison County, there are 2.0 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

The humidity can be uncomfortably heavy or close in Madison County during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in Madison County.

May is the wettest month in Madison County with 5.0 inches of rain, and the driest month is January with 2.4 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 Madison County means that it is wetter than most places in Illinois.

May is the rainiest month in Madison County with 10.9 days of rain, and September is the driest month with only 6.7 rainy days. There are 99.1 rainy days annually in Madison County, 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 13.4 inches in Madison County means that it is less snowy than most places in Illinois. January is the snowiest month in Madison County with 4.4 inches of snow, and 4 months of the year have significant snowfall.

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