Henderson County, IL Climate

Henderson, IL County has a humid continental climate. Summers are generally hot and humid, with temperatures often reaching into the 90s during July and August. Winters are cold and dry, and the area can experience occasional snowfall from November to March. The months of April, May, September, and October are usually mild with moderate rainfall. The average temperature in Henderson ranges from a low of 19 degrees Fahrenheit in January to a high of 87 degrees Fahrenheit in July. Precipitation levels range from an average of 28 inches per year near its northern border to 30-32 inches per year in the county's southern areas.

Henderson County, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Henderson County averages 22 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 201 sunny days per year in Henderson County. The US average is 205 sunny days.

Henderson 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 86 degrees
Winter Low: the January low is 16
Rain: averages 39 inches of rain a year
Snow: averages 22 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Henderson 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 Henderson County, while January and December are the least comfortable months.

Climate	Henderson, Illinois	United States
	38.9 in.	38.1 in.
	22.3 in.	27.8 in.
	107.5 days	106.2 days
	201 days	205 days
	85.6°	85.8°
	15.5°	21.7°
	7.1	7
	3.7	4.3
	637 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 Henderson County with an average high temperature of 85.6°, which ranks it as about average compared to other places in Illinois. In Henderson County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Henderson County are September, June and May.

In Henderson County, there are 18.8 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 Henderson County with an average of 15.5°. This is colder than most places in Illinois.

In Henderson County, there are 122.6 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Henderson County, there are 9.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

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

June is the wettest month in Henderson County with 4.7 inches of rain, and the driest month is January with 1.4 inches. The wettest season is Autumn with 34% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 38.9 inches in Henderson County means that it is about average compared to other places in Illinois.

May is the rainiest month in Henderson County with 11.8 days of rain, and February is the driest month with only 7.1 rainy days. There are 107.5 rainy days annually in Henderson 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 22.3 inches in Henderson County means that it is about average compared to other places in Illinois. January is the snowiest month in Henderson County with 6.6 inches of snow, and 6 months of the year have significant snowfall.

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