Clay, IL County has a humid continental climate, characterized by hot, humid summers and cold winters. During the summer months, average daily temperatures range from the mid-70s to low 80s Fahrenheit (23-29°C). Winters are cold and snowy, with average temperatures ranging from the mid 20s to low 30s Fahrenheit (-3 to -1°C). Precipitation is abundant throughout the year, with spring and summer months receiving the highest amount of rainfall on average. Snowfall in winter months can vary greatly but typically accumulates to around 12 inches (30 cm) annually.
Clay County, Illinois gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Clay County averages 11 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 202 sunny days per year in Clay County. The US average is 205 sunny days.
Clay County 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 88 degrees
Winter Low: the January low is 21
Rain: averages 45 inches of rain a year
Snow: averages 11 inches of snow a year