Farmington, IL typically has a humid continental climate. Winters are generally cold with moderate snowfall and temperatures that can drop to below freezing. Summers are typically warm and humid with frequent thunderstorms and temperatures that can reach up to the 90s. The area is known for its wide range of weather events, from severe thunderstorms to snow storms. Rain is common throughout the year and is welcomed as it helps sustain the agricultural industry in the area.
Farmington, Illinois gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Farmington averages 21 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 193 sunny days per year in Farmington. The US average is 205 sunny days.
Farmington gets some kind of precipitation, on average, 104 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 85 degrees
Winter Low: the January low is 15
Rain: averages 40 inches of rain a year
Snow: averages 21 inches of snow a year