McLean County, IL Climate

McLean County, IL has a humid continental climate, which is characterized by warm to hot summers and cold and snowy winters. Summers in McLean County typically range from the mid-70's to the mid-80's with occasional heat waves bringing temperatures into the 90s. Winters are usually cold with temperatures ranging from the mid-teens to low 30s, along with regular snowfalls averaging around 40 inches throughout the season. On average, precipitation levels reach between 38 and 43 inches per year; however, winters tend to be much wetter than summers due to increased snowfall.

McLean County, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.

McLean County averages 20 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 193 sunny days per year in McLean County. The US average is 205 sunny days.

McLean County gets some kind of precipitation, on average, 104 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 15
Rain: averages 39 inches of rain a year
Snow: averages 20 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for McLean County is 7.0 (10=best), which means it is about average compared to other places in Illinois.

8.6 Summer - 4.9 Winter

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

Climate	McLean, Illinois	United States
	Unlock	38.1 in.
	19.9 in.	Unlock
	Unlock	106.2 days
	193 days	Unlock
	85.2°	85.8°
	Unlock	21.7°
	7	Unlock
	Unlock	4.3
	767 ft.	Unlock

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 McLean County with an average high temperature of 85.2°, which ranks it as about average compared to other places in Illinois. In McLean County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for McLean County are September, May and June.

In McLean County, there are 18.2 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.

January has the coldest nighttime temperatures for McLean County with an average of 15.4°. This is colder than most places in Illinois.

In McLean County, there are 129.1 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In McLean County, there are 7.9 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

The humidity is usually comfortable in McLean County 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 McLean County are July, August and June.

May is the wettest month in McLean County with 4.4 inches of rain, and the driest month is February with 1.9 inches. The wettest season is Autumn with 31% of yearly precipitation and 17% occurs in Spring, which is the driest season. The annual rainfall of 38.6 inches in McLean County means that it is about average compared to other places in Illinois.

May is the rainiest month in McLean County with 10.7 days of rain, and February is the driest month with only 6.7 rainy days. There are 104.4 rainy days annually in McLean County, which is less rainy than most places in Illinois. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 22% chance of a rainy day.

An annual snowfall of 19.9 inches in McLean County means that it is about average compared to other places in Illinois. January is the snowiest month in McLean County with 5.9 inches of snow, and 6 months of the year have significant snowfall.

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