This image from the Illinois State Water Survey shows the climatological normal chances of a White Christmas, defined as 1" of snow on the ground Christmas morning. Most of central and southeast Illinois has between a 25% and 35% chance. (click image to enlarge)
Heavy snow fell across much of central and northern Illinois over a 3-day period. The storm produced 10 to 18 inches of snow. As a result, travel was at a standstill for two days. Springfield recorded a total of 14.6 inches of snow from the storm.