Big Rock, IL has a humid continental climate with warm summers and cold winters. The average high temperatures in the summer reach into the mid to upper 80s, while winter temperatures can drop into the single digits or even below zero. Precipitation is spread throughout the year, with snowfall being particularly heavy in winter months. Overall, Big Rock experiences four distinct seasons and is considered a mild climate compared to other areas of Illinois.
Big Rock, Illinois gets 38 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Big Rock averages 29 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 189 sunny days per year in Big Rock. The US average is 205 sunny days.
Big Rock gets some kind of precipitation, on average, 117 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 84 degrees
Winter Low: the January low is 15
Rain: averages 38 inches of rain a year
Snow: averages 29 inches of snow a year