Climate in Mercer, Illinois

Mercer, Illinois gets 38 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Mercer averages 23 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 201 sunny days per year in Mercer. The US average is 205 sunny days.

Mercer gets some kind of precipitation, on average, 94 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 85 degrees
Winter Low: the January low is 14
Rain: averages 38 inches of rain a year
Snow: averages 23 inches of snow a year

BESTPLACES COMFORT INDEX

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

July is the hottest month for Mercer with an average high temperature of 84.7°, which ranks it as cooler than most places in Illinois. In Mercer, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mercer are September, June and August.

In Mercer, there are 14.3 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

January has the coldest nighttime temperatures for Mercer with an average of 14.0°. This is colder than most places in Illinois.

In Mercer, there are 131.9 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Mercer, there are 10.7 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

The humidity is usually comfortable in Mercer but some summer months can be unpleasant. July is the most humid month, though humidity is low for most of the year. The most humid months in Mercer are July, August and June.

June is the wettest month in Mercer with 4.6 inches of rain, and the driest month is January with 1.4 inches. The wettest season is Autumn with 34% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 37.6 inches in Mercer means that it is drier than most places in Illinois.

May is the rainiest month in Mercer with 11.0 days of rain, and February is the driest month with only 6.1 rainy days. There are 94.4 rainy days annually in Mercer, which is one of the least rainy places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 20% chance of a rainy day.

An annual snowfall of 23.4 inches in Mercer means that it is snowier than most places in Illinois. January is the snowiest month in Mercer with 7.4 inches of snow, and 6 months of the year have significant snowfall.

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