Decatur, IL experiences a humid continental climate with warm summers and cold winters. There are four distinct seasons throughout the year, with July and August being the warmest months with average temperatures reaching around 84°F. January is usually the coldest month of the year, when temperatures can dip to an average low of 17°F. The area receives plenty of precipitation throughout the year, with most falling in April and May. The region also experiences occasional snowfall during the winter season, though it is rarely too excessive.
Decatur (zip 62526), Illinois gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Decatur (zip 62526) averages 13 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 198 sunny days per year in Decatur (zip 62526). The US average is 205 sunny days.
Decatur (zip 62526) gets some kind of precipitation, on average, 110 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 87 degrees
Winter Low: the January low is 19
Rain: averages 40 inches of rain a year
Snow: averages 13 inches of snow a year