Lee County, IL Climate

Lee, IL County has a humid continental climate, with cold, snowy winters and hot, humid summers. Average winter temperatures range from 25-30°F (-4 to -1°C), while average summer temperatures range from 75-80°F (24 to 27°C). Precipitation is abundant throughout the year, with average rainfall of 38 inches (965 mm) annually and snowfall averaging around 43 inches (1090 mm). The area is prone to extreme weather events like flooding, severe thunderstorms, and occasional tornadoes.

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

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

On average, there are 191 sunny days per year in Lee County. The US average is 205 sunny days.

Lee County gets some kind of precipitation, on average, 103 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 12
Rain: averages 37 inches of rain a year
Snow: averages 28 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Lee County is 6.9 (10=best), which means it is less comfortable than most places in Illinois.

9 Summer - 4.5 Winter

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

Climate	Lee, Illinois	United States
	Unlock	38.1 in.
	28.1 in.	Unlock
	Unlock	106.2 days
	191 days	Unlock
	82.8°	85.8°
	Unlock	21.7°
	6.9	Unlock
	Unlock	4.3
	790 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 Lee County with an average high temperature of 82.8°, which ranks it as one of the coolest places in Illinois. In Lee County, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lee County are June, August and September.

In Lee County, there are 9.3 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 Lee County with an average of 11.9°. This is one of the coldest places in Illinois.

In Lee County, there are 142.1 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

In Lee County, there are 13.8 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.

The humidity is usually comfortable in Lee 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.

June is the wettest month in Lee County with 4.5 inches of rain, and the driest month is January with 1.5 inches. The wettest season is Autumn with 35% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 37.0 inches in Lee County means that it is drier than most places in Illinois.

May is the rainiest month in Lee County with 10.9 days of rain, and February is the driest month with only 6.4 rainy days. There are 103.2 rainy days annually in Lee County, which is less rainy 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 22% chance of a rainy day.

An annual snowfall of 28.1 inches in Lee County means that it is snowier than most places in Illinois. January is the snowiest month in Lee County with 9.6 inches of snow, and 6 months of the year have significant snowfall.

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