Rio, Illinois has a humid continental climate which means that temperatures can vary greatly throughout the year. Summers are typically hot and humid with temperatures usually reaching into the upper 80's and low 90's. Winters bring cold and snowy weather with temperatures sometimes dropping below 0°F. The area also receives an average of 40 inches of precipitation each year, mostly during the warmer months when thunderstorms are common. Due to its location in northern Illinois near Lake Michigan, Rio experiences four distinct seasons with changeable weather throughout the year.
Rio, Illinois gets 38 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Rio averages 25 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 195 sunny days per year in Rio. The US average is 205 sunny days.
Rio gets some kind of precipitation, on average, 109 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 14
Rain: averages 38 inches of rain a year
Snow: averages 25 inches of snow a year