Oswego, IL experiences a humid continental climate. Summers are usually warm and humid with temperatures averaging in the high 70s掳F (25掳C), while winters can be cold and snowy with temperatures averaging in the mid-20s掳F (-4掳C). The area receives an average of approximately 35 inches (89 cm) of precipitation per year, primarily concentrated between April and October. During the winter months, snowfall is common, providing a beautiful landscape. On average, Oswego receives about 33 inches (83 cm) of snow per year.
Oswego, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Oswego averages 30 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 188 sunny days per year in Oswego. The US average is 205 sunny days.
Oswego gets some kind of precipitation, on average, 123 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 39 inches of rain a year
Snow: averages 30 inches of snow a year