Lake County, IL Climate

The climate in Lake County, IL is generally mild and humid. Summers are hot and humid with temperatures reaching up to the mid-90s, while winters are cold and snowy. The average snowfall for the area is around 34 inches per year. Precipitation averages around 40 inches annually, mainly occurring during the warmer months of April through October. The area tends to have moderate levels of humidity throughout the year, making it a comfortable place to live year-round.

Lake County, Illinois gets 36 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Lake County averages 39 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 189 sunny days per year in Lake County. The US average is 205 sunny days.

Lake County gets some kind of precipitation, on average, 120 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 82 degrees
Winter Low: the January low is 15
Rain: averages 36 inches of rain a year
Snow: averages 39 inches of snow a year

Bestplaces Comfort Index

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

9.1 Summer - 4.4 Winter

June, August and September are the most pleasant months in Lake County, while January and December are the least comfortable months.

Climate	Lake, Illinois	United States
	36.1 in.	38.1 in.
	39.4 in.	27.8 in.
	119.5 days	106.2 days
	189 days	205 days
	82.0°	85.8°
	14.8°	21.7°
	6.8	7
	3.7	4.3
	741 ft.	2443 ft.

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Lake County with an average high temperature of 82.0°, which ranks it as one of the coolest places in Illinois. In Lake County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lake County are June, August and July.

In Lake County, there are 9.7 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

January has the coldest nighttime temperatures for Lake County with an average of 14.8°. This is colder than most places in Illinois.

In Lake County, there are 131.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Lake County, there are 8.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

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

May is the wettest month in Lake County with 4.0 inches of rain, and the driest month is January with 1.7 inches. The wettest season is Autumn with 32% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 36.1 inches in Lake County means that it is one of the driest places in Illinois.

May is the rainiest month in Lake County with 12.0 days of rain, and February is the driest month with only 8.0 rainy days. There are 119.5 rainy days annually in Lake 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 39.4 inches in Lake County means that it is one of the snowiest places in Illinois. January is the snowiest month in Lake County with 12.1 inches of snow, and 6 months of the year have significant snowfall.

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