McLean, IL experiences all four seasons with warm summers and cold winters. The average temperature during the summer months is around 78°F while the average temperature in the winter months is around 28°F. Precipitation is fairly consistent throughout the year with an average of 36 inches of rain and snowfall combined annually. Winters tend to be much drier than summers, with January being the driest month of the year overall. The humidity levels in McLean, IL are generally quite low throughout both summer and winter months, making for pleasant temperatures and comfortable outdoor activities all year round.
McLean, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.
McLean averages 22 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 192 sunny days per year in McLean. The US average is 205 sunny days.
McLean gets some kind of precipitation, on average, 110 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 22 inches of snow a year