LaSalle County, IL enjoys a continental climate with four distinct seasons. Summers are usually warm and humid, with temperatures ranging from the mid-60s in the morning to the mid-80s in the afternoon. Winters are cold, with average temperatures hovering around 32°F throughout most of the colder months. Spring and fall are generally mild, with temperatures averaging in the high 50s and low 60s. The county is known for having an abundance of snowfall during winter months, with an annual mean snowfall of approximately 31 inches. Precipitation levels are fairly even throughout the year, making LaSalle County a great place to visit all year long.
LaSalle County, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.
LaSalle County averages 23 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 191 sunny days per year in LaSalle County. The US average is 205 sunny days.
LaSalle County gets some kind of precipitation, on average, 112 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 37 inches of rain a year
Snow: averages 23 inches of snow a year