Massac County, IL has a humid continental climate, with hot and humid summers and cold winters. The area experiences four distinct seasons throughout the year, with temperatures typically ranging from 21 to 90 degrees Fahrenheit. Summer months tend to be the hottest and most humid, with average high temperatures reaching into the mid-90s on occasion. Rainfall is relatively common throughout all of the seasons in Massac County. The area averages about 37 inches of precipitation annually, with snowfall occurring mainly during the winter months. Snowfall is usually light compared to other parts of Illinois, but heavy blizzards can occur occasionally.
Massac County, Illinois gets 48 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Massac County averages 7 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 Massac County. The US average is 205 sunny days.
Massac County gets some kind of precipitation, on average, 107 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 25
Rain: averages 48 inches of rain a year
Snow: averages 7 inches of snow a year