Monmouth, IL has a humid continental climate with four distinct seasons. Summers are hot and humid, with temperatures often reaching the mid-80s during the day and low-70s at night. Spring and fall are mild with temperatures ranging between 40-60 degrees, while winters can be cold and snowy, with occasional blizzards bringing heavy snowfall to the city. Precipitation is spread fairly evenly throughout the year, with occasional thunderstorms in spring and summer.
Monmouth, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Monmouth averages 24 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 Monmouth. The US average is 205 sunny days.
Monmouth gets some kind of precipitation, on average, 108 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 14
Rain: averages 39 inches of rain a year
Snow: averages 24 inches of snow a year