Vermilion County, IL Climate

The climate in Vermilion County, IL is mostly temperate with hot and humid summers and cold winters. The average high temperature during the summer months from June to August is around 80°F (27°C), while the average low temperature in wintertime (December to February) is around 19°F (-7°C). Precipitation is fairly evenly distributed throughout the year but heavier during the spring and summer months. Snowfall averages slightly more than 20 inches per year so snow can be expected in wintertime. Winds tend to be light and variable due to its location near two large bodies of water.

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

Vermilion County averages 18 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 188 sunny days per year in Vermilion County. The US average is 205 sunny days.

Vermilion County gets some kind of precipitation, on average, 112 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 18
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 Vermilion County is 7.1 (10=best), which means it is more comfortable than most places in Illinois.

8.5 Summer - 5.1 Winter

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

Climate	Vermilion, Illinois	United States
	40.3 in.	38.1 in.
	17.9 in.	27.8 in.
	111.5 days	106.2 days
	188 days	205 days
	85.5°	85.8°
	17.5°	21.7°
	7.1	7
	3.7	4.3
	683 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 Vermilion County with an average high temperature of 85.5°, which ranks it as about average compared to other places in Illinois. In Vermilion County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Vermilion County are September, May and June.

In Vermilion County, there are 19.4 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 Vermilion County with an average of 17.5°. This is about average compared to other places in Illinois.

In Vermilion County, there are 119.2 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Vermilion County, there are 6.8 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 Vermilion 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 Vermilion County are July, August and June.

July is the wettest month in Vermilion County with 4.7 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 40.3 inches in Vermilion County means that it is wetter than most places in Illinois.

May is the rainiest month in Vermilion County with 11.5 days of rain, and September is the driest month with only 7.4 rainy days. There are 111.5 rainy days annually in Vermilion 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 Winter with only a 23% chance of a rainy day.

An annual snowfall of 17.9 inches in Vermilion County means that it is less snowy than most places in Illinois. January is the snowiest month in Vermilion County with 5.6 inches of snow, and 4 months of the year have significant snowfall.

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