Warren County, IL Climate

Warren County, IL has a humid continental climate with hot, humid summers and cold winters. The summers are characterized by high temperatures and abundant rainfall while the winters experience below-freezing temperatures with occasional snowfall. On average, Warren County receives around 40 inches of precipitation annually. During the winter months, the coldest temperature recorded was -20 degrees Fahrenheit, while during the summer months, the hottest temperature recorded reached nearly 95 degrees Fahrenheit. The area is known for its dramatic seasonal shifts in weather conditions from bitterly cold winter days to sweltering summer afternoons.

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

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

On average, there are 200 sunny days per year in Warren County. The US average is 205 sunny days.

Warren County gets some kind of precipitation, on average, 105 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 15
Rain: averages 39 inches of rain a year
Snow: averages 24 inches of snow a year

Bestplaces Comfort Index

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

8.6 Summer - 4.9 Winter

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

Climate	Warren, Illinois	United States
	Unlock	38.1 in.
	23.9 in.	Unlock
	Unlock	106.2 days
	200 days	Unlock
	85.0°	85.8°
	Unlock	21.7°
	7	Unlock
	Unlock	4.3
	716 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 Warren County with an average high temperature of 85.0°, which ranks it as about average compared to other places in Illinois. In Warren County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Warren County are September, June and May.

In Warren County, there are 15.4 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

January has the coldest nighttime temperatures for Warren County with an average of 14.6°. This is colder than most places in Illinois.

In Warren County, there are 128.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Warren County, there are 9.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

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

May is the wettest month in Warren County with 4.7 inches of rain, and the driest month is January with 1.6 inches. The wettest season is Autumn with 33% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 38.7 inches in Warren County means that it is about average compared to other places in Illinois.

May is the rainiest month in Warren County with 12.0 days of rain, and February is the driest month with only 6.7 rainy days. There are 104.8 rainy days annually in Warren 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 23.9 inches in Warren County means that it is snowier than most places in Illinois. January is the snowiest month in Warren County with 7.7 inches of snow, and 6 months of the year have significant snowfall.

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