Mason County, IL Climate

Mason County, IL has a humid continental climate with cold, snowy winters and warm summers. The county experiences four distinct seasons with spring and fall both being mild. The average annual temperature in Mason County is around 53°F, with January being the coldest month and July being the warmest. Average annual precipitation is 37 inches, mostly occurring during the spring and summer months. Winters are often dry and sunny, while summers can be hot and muggy as temperatures rise into the mid-80s. While Mason County does experience occasional bouts of extreme weather such as thunderstorms and tornadoes, it is generally a pleasant place to live.

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

Mason County averages 19 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 195 sunny days per year in Mason County. The US average is 205 sunny days.

Mason County gets some kind of precipitation, on average, 97 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 17
Rain: averages 39 inches of rain a year
Snow: averages 19 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Mason County is 7.1 (10=best), which means it is more comfortable than most places in Illinois.

8.3 Summer - 5.2 Winter

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

Climate	Mason, Illinois	United States
	Unlock	38.1 in.
	19.1 in.	Unlock
	Unlock	106.2 days
	195 days	Unlock
	86.2°	85.8°
	Unlock	21.7°
	7.1	Unlock
	Unlock	4.3
	504 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 Mason County with an average high temperature of 86.2°, which ranks it as warmer than most places in Illinois. In Mason County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mason County are September, May and June.

In Mason County, there are 23.4 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

January has the coldest nighttime temperatures for Mason County with an average of 16.6°. This is about average compared to other places in Illinois.

In Mason County, there are 122.6 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Mason County, there are 7.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.

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

May is the wettest month in Mason County with 4.6 inches of rain, and the driest month is February with 1.8 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 39.1 inches in Mason County means that it is about average compared to other places in Illinois.

May is the rainiest month in Mason County with 10.6 days of rain, and February is the driest month with only 6.3 rainy days. There are 97.2 rainy days annually in Mason 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 Spring with only a 21% chance of a rainy day.

An annual snowfall of 19.1 inches in Mason County means that it is about average compared to other places in Illinois. January is the snowiest month in Mason County with 6.1 inches of snow, and 4 months of the year have significant snowfall.

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