Clark County, IL Climate

Clark, IL County has a humid continental climate. Summers are typically hot and humid with temperatures reaching up to 90 degrees Fahrenheit, while winters can be cold with temperatures dropping to as low as 0 degrees Fahrenheit. The area sees an average of 36 inches of precipitation per year, mostly falling in the form of rain during the spring and summer months. Snowfall is common during winter months with an average snowfall of around 18 inches per year. Overall, Clark, IL County enjoys mild weather throughout the year but experiences extreme temperature fluctuations due to its location on the edge of the Midwest.

Clark County, Illinois gets 43 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Clark County averages 16 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 198 sunny days per year in Clark County. The US average is 205 sunny days.

Clark County gets some kind of precipitation, on average, 111 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 87 degrees
Winter Low: the January low is 20
Rain: averages 43 inches of rain a year
Snow: averages 16 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Clark County is 7.1 (10=best), which means it is more comfortable than most places in Illinois.

8.1 Summer - 5.3 Winter

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

Climate	Clark, Illinois	United States
	Unlock	38.1 in.
	15.7 in.	Unlock
	Unlock	106.2 days
	198 days	Unlock
	86.7°	85.8°
	Unlock	21.7°
	7.1	Unlock
	Unlock	4.3
	584 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 Clark County with an average high temperature of 86.7°, which ranks it as warmer than most places in Illinois. In Clark County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Clark County are September, May and June.

In Clark County, there are 23.9 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

January has the coldest nighttime temperatures for Clark County with an average of 20.0°. This is warmer than most places in Illinois.

In Clark County, there are 107.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Clark County, there are 3.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

The humidity can be uncomfortably heavy or close in Clark County during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in Clark County.

May is the wettest month in Clark County with 4.8 inches of rain, and the driest month is February with 2.4 inches. The wettest season is Summer with 28% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 43.2 inches in Clark County means that it is wetter than most places in Illinois.

May is the rainiest month in Clark County with 11.7 days of rain, and September is the driest month with only 7.0 rainy days. There are 110.6 rainy days annually in Clark County, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 15.7 inches in Clark County means that it is less snowy than most places in Illinois. January is the snowiest month in Clark County with 6.0 inches of snow, and 4 months of the year have significant snowfall.

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