Collinsville, IL has a humid continental climate with hot summers and cold winters. The summers in Collinsville tend to be quite warm with high temperatures reaching into the 80s and 90s Fahrenheit on average. Winter temperatures in the city typically fall below freezing and can dip down into the single digits or teens at night. Precipitation is typical throughout the year, with slightly higher amounts during spring and summer months. Snowfall is not uncommon during winter months, although it usually melts quickly due to the relatively mild winter temperatures. Overall, Collinsville enjoys four distinct seasons that bring a variety of weather conditions throughout the year.
Collinsville, Illinois gets 43 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Collinsville averages 13 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 199 sunny days per year in Collinsville. The US average is 205 sunny days.
Collinsville gets some kind of precipitation, on average, 102 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 89 degrees
Winter Low: the January low is 22
Rain: averages 43 inches of rain a year
Snow: averages 13 inches of snow a year