Iroquois County, IL Climate

Iroquois County, IL has a humid continental climate that experiences hot, humid summers and cold but relatively mild winters. The warmest months of the year are June, July and August when temperatures average in the mid-80s Fahrenheit. Winters tend to bring light snowfall and temperatures between 20-30 degrees Fahrenheit. Spring and fall are pleasant with temperatures between 40-70 degrees Fahrenheit. Overall, Iroquois County enjoys four distinct seasons with plenty of sunshine throughout the year.

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

Iroquois County averages 20 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 189 sunny days per year in Iroquois County. The US average is 205 sunny days.

Iroquois County gets some kind of precipitation, on average, 110 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 16
Rain: averages 39 inches of rain a year
Snow: averages 20 inches of snow a year

Bestplaces Comfort Index

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

8.7 Summer - 4.9 Winter

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

Climate	Iroquois, Illinois	United States
	39.0 in.	38.1 in.
	20.2 in.	27.8 in.
	110.3 days	106.2 days
	189 days	205 days
	84.7°	85.8°
	15.8°	21.7°
	7	7
	3.7	4.3
	666 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 Iroquois County with an average high temperature of 84.7°, which ranks it as cooler than most places in Illinois. In Iroquois County, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Iroquois County are September, June and May.

In Iroquois County, there are 17.6 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 Iroquois County with an average of 15.8°. This is colder than most places in Illinois.

In Iroquois County, there are 127.2 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In Iroquois County, there are 8.7 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

The humidity is usually comfortable in Iroquois County but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.

July is the wettest month in Iroquois County with 4.5 inches of rain, and the driest month is January with 1.9 inches. The wettest season is Autumn with 32% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 39.0 inches in Iroquois County means that it is about average compared to other places in Illinois.

May is the rainiest month in Iroquois County with 11.3 days of rain, and February is the driest month with only 7.2 rainy days. There are 110.3 rainy days annually in Iroquois County, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 23% chance of a rainy day.

An annual snowfall of 20.2 inches in Iroquois County means that it is about average compared to other places in Illinois. January is the snowiest month in Iroquois County with 6.2 inches of snow, and 6 months of the year have significant snowfall.

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