Boone County, IL Climate

Boone County, IL has a humid continental climate with long, cold winters and hot, humid summers. The average temperature in the summer months is around 77°F while the average temperature in the winter months is around 24°F. Precipitation throughout the year averages about 44 inches with snowfall ranging from 3 to 6 inches per month in the colder months. Boone County typically experiences all four seasons and temperatures can vary greatly between day and night.

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

Boone County averages 33 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 Boone County. The US average is 205 sunny days.

Boone 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 12
Rain: averages 37 inches of rain a year
Snow: averages 33 inches of snow a year

Bestplaces Comfort Index

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

9 Summer - 4.3 Winter

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

Climate	Boone, Illinois	United States
	36.8 in.	38.1 in.
	32.8 in.	27.8 in.
	115.6 days	106.2 days
	191 days	205 days
	83.3°	85.8°
	12.0°	21.7°
	6.8	7
	3.7	4.3
	863 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 Boone County with an average high temperature of 83.3°, which ranks it as one of the coolest places in Illinois. In Boone County, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Boone County are June, August and September.

In Boone County, there are 10.8 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

January has the coldest nighttime temperatures for Boone County with an average of 12.0°. This is one of the coldest places in Illinois.

In Boone County, there are 140.4 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.

In Boone County, there are 13.7 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 Boone 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.

August is the wettest month in Boone County with 4.7 inches of rain, and the driest month is January with 1.4 inches. The wettest season is Autumn with 36% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 36.8 inches in Boone County means that it is drier than most places in Illinois.

May is the rainiest month in Boone County with 12.0 days of rain, and February is the driest month with only 7.8 rainy days. There are 115.6 rainy days annually in Boone 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 32.8 inches in Boone County means that it is snowier than most places in Illinois. December is the snowiest month in Boone County with 9.9 inches of snow, and 6 months of the year have significant snowfall.

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