Knox County, IL Climate

Knox County, IL has a humid continental climate, characterized by warm muggy summers and cold winters. Temperatures in the summer months average in the high 70's to low 80's with plenty of sunshine and occasional showers. Winters bring temperatures that range from just below freezing to the high 20's, with frequent snowfall and occasional ice storms. Rainfall throughout the year is moderate, averaging around 40 inches annually. Despite its location near Lake Michigan, temperatures tend to stay mild due to lake effect moderation.

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

Knox County averages 24 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 196 sunny days per year in Knox County. The US average is 205 sunny days.

Knox County gets some kind of precipitation, on average, 108 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 84 degrees
Winter Low: the January low is 14
Rain: averages 38 inches of rain a year
Snow: averages 24 inches of snow a year

Bestplaces Comfort Index

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

8.8 Summer - 4.7 Winter

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

Climate	Knox, Illinois	United States
	38.3 in.	38.1 in.
	23.7 in.	27.8 in.
	107.8 days	106.2 days
	196 days	205 days
	84.2°	85.8°
	13.7°	21.7°
	7	7
	3.7	4.3
	712 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 Knox County with an average high temperature of 84.2°, which ranks it as cooler than most places in Illinois. In Knox County, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Knox County are September, June and August.

In Knox County, there are 10.9 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

January has the coldest nighttime temperatures for Knox County with an average of 13.7°. This is colder than most places in Illinois.

In Knox County, there are 133.2 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Knox County, there are 9.8 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

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

May is the wettest month in Knox County with 4.5 inches of rain, and the driest month is January with 1.7 inches. The wettest season is Autumn with 33% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 38.3 inches in Knox County means that it is drier than most places in Illinois.

May is the rainiest month in Knox County with 11.7 days of rain, and February is the driest month with only 6.9 rainy days. There are 107.8 rainy days annually in Knox County, which is about average compared to other places in Illinois. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 21% chance of a rainy day.

An annual snowfall of 23.7 inches in Knox County means that it is snowier than most places in Illinois. January is the snowiest month in Knox County with 7.2 inches of snow, and 5 months of the year have significant snowfall.

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