Cass County, IL Climate

Cass County, IL has a humid continental climate. The summers are hot and humid with temperatures ranging from the low 80s to the high 90s. Winters are somewhat cold with temperatures often dropping below freezing during the night. Snowfall is common in winter months and spring rains bring much needed relief for the area's crops. In autumn, temperatures remain mild until late in the season when they turn cooler. This county receives plenty of sunshine throughout the year with an average of four or more hours a day in all seasons.

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

Cass County averages 17 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 Cass County. The US average is 205 sunny days.

Cass County gets some kind of precipitation, on average, 96 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 17
Rain: averages 39 inches of rain a year
Snow: averages 17 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Cass County is 7.2 (10=best), which means it is one of the most pleasant places in Illinois.

8.3 Summer - 5.4 Winter

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

Climate	Cass, Illinois	United States
	Unlock	38.1 in.
	16.6 in.	Unlock
	Unlock	106.2 days
	198 days	Unlock
	86.6°	85.8°
	Unlock	21.7°
	7.2	Unlock
	Unlock	4.3
	538 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 Cass County with an average high temperature of 86.6°, which ranks it as warmer than most places in Illinois. In Cass County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Cass County are September, May and June.

In Cass County, there are 22.8 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

January has the coldest nighttime temperatures for Cass County with an average of 17.4°. This is about average compared to other places in Illinois.

In Cass County, there are 121.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Cass County, there are 5.8 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

The humidity can be uncomfortably heavy or close in Cass 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 Cass County.

May is the wettest month in Cass County with 4.5 inches of rain, and the driest month is January with 1.8 inches. The wettest season is Autumn with 30% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 38.7 inches in Cass County means that it is about average compared to other places in Illinois.

May is the rainiest month in Cass County with 10.3 days of rain, and February is the driest month with only 5.8 rainy days. There are 95.7 rainy days annually in Cass County, which is one of the least rainy places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 21% chance of a rainy day.

An annual snowfall of 16.6 inches in Cass County means that it is less snowy than most places in Illinois. January is the snowiest month in Cass County with 5.0 inches of snow, and 4 months of the year have significant snowfall.

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