The climate in Stephenson County, IL is generally mild and temperate. Summers are usually hot and humid with temperatures reaching the mid-80s on average, while winters are typically cold but not overly harsh. Snowfall can occur frequently during the winter months, but it rarely accumulates enough to be a major travel hazard. The county's location near the Mississippi River ensures that it receives plenty of rain throughout the year, making it a great place for agricultural production.
Stephenson County, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Stephenson County averages 34 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 191 sunny days per year in Stephenson County. The US average is 205 sunny days.
Stephenson County gets some kind of precipitation, on average, 113 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 11
Rain: averages 37 inches of rain a year
Snow: averages 34 inches of snow a year