Washington, IL has a humid continental climate with hot summers and cold winters. The area experiences high levels of precipitation throughout the year, with moderate to heavy snowfall in the winter months. Summers tend to be hot and humid, with temperatures reaching into the mid-80s on average. Winters are cold and wet, with average lows dropping down into the 20s. Spring and fall are usually mild, but can still experience some extreme temperatures.
Washington, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Washington averages 24 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 194 sunny days per year in Washington. The US average is 205 sunny days.
Washington gets some kind of precipitation, on average, 108 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 86 degrees
Winter Low: the January low is 16
Rain: averages 39 inches of rain a year
Snow: averages 24 inches of snow a year