Swansea, IL enjoys a humid subtropical climate, experiencing all four distinct seasons with mild and relatively wet winters and hot, humid summers. Average daily high temperatures range from the mid-20s in January to just over 86 degrees during the summer months. The area also gets a considerable amount of precipitation throughout the year, receiving about 47 inches of rain on average. Snowfall is moderate at around 17 inches per year.
Swansea, Illinois gets 42 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Swansea averages 13 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 201 sunny days per year in Swansea. The US average is 205 sunny days.
Swansea gets some kind of precipitation, on average, 100 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 42 inches of rain a year
Snow: averages 13 inches of snow a year