Williamson County, IL Climate

The climate of Williamson County, IL is classified as humid subtropical. Summers in the county are hot and humid, with temperatures typically ranging from the mid-80s to low-90s Fahrenheit. Winters are cold but generally mild, with temperatures rarely dropping below freezing. The area receives an average of approximately 47 inches of rain each year and occasional snowfall in the winter months. Overall, Williamson County has a pleasant climate throughout the year, making it a great place to live or visit!

Williamson County, Illinois gets 46 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Williamson County averages 12 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 207 sunny days per year in Williamson County. The US average is 205 sunny days.

Williamson 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 88 degrees
Winter Low: the January low is 23
Rain: averages 46 inches of rain a year
Snow: averages 12 inches of snow a year

Bestplaces Comfort Index

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

7.6 Summer - 5.7 Winter

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

Climate	Williamson, Illinois	United States
	46.3 in.	38.1 in.
	11.6 in.	27.8 in.
	103.3 days	106.2 days
	207 days	205 days
	87.9°	85.8°
	23.0°	21.7°
	7.2	7
	4.1	4.3
	471 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 Williamson County with an average high temperature of 87.9°, which ranks it as warmer than most places in Illinois. In Williamson County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Williamson County are May, September and June.

In Williamson County, there are 30.8 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

January has the coldest nighttime temperatures for Williamson County with an average of 23.0°. This is one of the warmest places in Illinois.

In Williamson County, there are 98.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Williamson County, there are 1.8 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 Williamson 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 Williamson County.

May is the wettest month in Williamson 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 22% occurs in Spring, which is the driest season. The annual rainfall of 46.3 inches in Williamson County means that it is one of the wettest places in Illinois.

May is the rainiest month in Williamson County with 10.9 days of rain, and September is the driest month with only 6.8 rainy days. There are 103.3 rainy days annually in Williamson 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 Winter with only a 23% chance of a rainy day.

An annual snowfall of 11.6 inches in Williamson County means that it is less snowy than most places in Illinois. February is the snowiest month in Williamson County with 3.9 inches of snow, and 4 months of the year have significant snowfall.

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