De Witt County, IL Climate

De Witt County, IL has a humid continental climate, meaning that summers are hot and humid with temperatures reaching the high 80s, while winters can be cold and snowy. Rainfall is fairly average throughout the year, with precipitation peaking in May and June. The region experiences frequent thunderstorms in the summer months as well as occasional tornadoes. Spring and fall tend to bring moderate temperatures and mild weather patterns. Overall, De Witt County enjoys a temperate climate conducive to outdoor activities all year round.

De Witt County, Illinois gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.

De Witt County averages 18 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 De Witt County. The US average is 205 sunny days.

De Witt County gets some kind of precipitation, on average, 106 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 17
Rain: averages 40 inches of rain a year
Snow: averages 18 inches of snow a year

Bestplaces Comfort Index

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

8.5 Summer - 5 Winter

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

Climate	De Witt, Illinois	United States
	39.8 in.	38.1 in.
	17.9 in.	27.8 in.
	105.8 days	106.2 days
	196 days	205 days
	85.3°	85.8°
	16.7°	21.7°
	7.1	7
	3.9	4.3
	722 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 De Witt County with an average high temperature of 85.3°, which ranks it as about average compared to other places in Illinois. In De Witt County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for De Witt County are September, May and June.

In De Witt County, there are 17.7 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 De Witt County with an average of 16.7°. This is about average compared to other places in Illinois.

In De Witt County, there are 123.5 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In De Witt County, there are 6.5 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

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

July is the wettest month in De Witt County with 4.5 inches of rain, and the driest month is January with 2.0 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 39.8 inches in De Witt County means that it is wetter than most places in Illinois.

May is the rainiest month in De Witt County with 10.9 days of rain, and February is the driest month with only 7.1 rainy days. There are 105.8 rainy days annually in De Witt County, which is about average compared to other places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 22% chance of a rainy day.

An annual snowfall of 17.9 inches in De Witt County means that it is less snowy than most places in Illinois. December is the snowiest month in De Witt County with 5.5 inches of snow, and 5 months of the year have significant snowfall.

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