Savanna, IL has a humid continental climate. Summers are usually hot and humid, with temperatures often reaching into the 90s Fahrenheit (32+ Celsius). Winters are cold with plenty of snowfall, due to lake effect snow from Lake Michigan. Spring and fall bring moderate temperatures and occasional thunderstorms. The area receives an average of 38 inches of precipitation per year, with most of it falling in the spring and summer months.
Savanna, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Savanna averages 30 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 196 sunny days per year in Savanna. The US average is 205 sunny days.
Savanna gets some kind of precipitation, on average, 106 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 30 inches of snow a year