Union County, IL Climate

Union County, IL is located in the mid-western portion of the United States and enjoys a temperate climate with four distinct seasons. Summers are hot and humid, with temperatures often reaching into the upper 80s and 90s. Winters are cold but generally mild with snowfall occurring throughout the season. Spring brings blooming flowers to the area, while fall provides beautiful foliage and pleasant temperatures. The county receives an average of 40 inches of rainfall per year spread out over all four seasons.

Union County, Illinois gets 48 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Union County averages 10 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 216 sunny days per year in Union County. The US average is 205 sunny days.

Union County gets some kind of precipitation, on average, 103 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 89 degrees
Winter Low: the January low is 24
Rain: averages 48 inches of rain a year
Snow: averages 10 inches of snow a year

Bestplaces Comfort Index

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

7.3 Summer - 5.8 Winter

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

Climate	Union, Illinois	United States
	Unlock	38.1 in.
	10.0 in.	Unlock
	Unlock	106.2 days
	216 days	Unlock
	88.9°	85.8°
	Unlock	21.7°
	7.2	Unlock
	Unlock	4.3
	499 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 Union County with an average high temperature of 88.9°, which ranks it as one of the hottest places in Illinois. In Union County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Union County are May, September and October.

In Union County, there are 37.7 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.

January has the coldest nighttime temperatures for Union County with an average of 23.8°. This is one of the warmest places in Illinois.

In Union County, there are 92.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.

In Union County, there are 1.5 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.

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

May is the wettest month in Union County with 5.4 inches of rain, and the driest month is August with 3.0 inches. The wettest season is Summer with 30% of yearly precipitation and 23% occurs in Spring, which is the driest season. The annual rainfall of 48.1 inches in Union County means that it is one of the wettest places in Illinois.

May is the rainiest month in Union County with 10.8 days of rain, and August is the driest month with only 6.5 rainy days. There are 103.0 rainy days annually in Union County, which is less rainy than most places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Autumn with only a 22% chance of a rainy day.

An annual snowfall of 10.0 inches in Union County means that it is one of the least snowy places in Illinois. February is the snowiest month in Union County with 3.4 inches of snow, and 4 months of the year have significant snowfall.

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