Climate in McHenry County, Illinois

McHenry County, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.

McHenry County averages 35 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 190 sunny days per year in McHenry County. The US average is 205 sunny days.

McHenry County gets some kind of precipitation, on average, 116 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 83 degrees
Winter Low: the January low is 13
Rain: averages 37 inches of rain a year
Snow: averages 35 inches of snow a year

BESTPLACES COMFORT INDEX

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

July is the hottest month for McHenry County with an average high temperature of 82.7°, which ranks it as one of the coolest places in Illinois. In McHenry County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for McHenry County are June, August and September.

January has the coldest nighttime temperatures for McHenry County with an average of 12.8°. This is colder than most places in Illinois.

In McHenry County, there are 10.1 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In McHenry County, there are 138.8 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

In McHenry County, there are 12.0 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.

August is the wettest month in McHenry County with 4.4 inches of rain, and the driest month is January with 1.6 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 36.5 inches in McHenry County means that it is one of the driest places in Illinois.

May is the rainiest month in McHenry County with 11.8 days of rain, and February is the driest month with only 7.6 rainy days. There are 115.5 rainy days annually in McHenry County, 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.

An annual snowfall of 35.4 inches in McHenry County means that it is one of the snowiest places in Illinois. January is the snowiest month in McHenry County with 10.8 inches of snow, and 6 months of the year have significant snowfall.

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