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)
An out of season severe weather outbreak produced 19 tornadoes in Illinois. Collectively, 13 people were killed and 259 injured, with property damage between $8-10 million. Tornadoes were reported as far north as Mason and Vermilion counties, but most of the tornadoes were across the southern third of the state. The city of Murphysboro was hardest hit, with 10 people killed and electricity lost for a few days. One of the tornadoes, in Perry County, reached F5 intensity, while F4 strength tornadoes affected the Mt. Vernon and Murphysboro areas.
A powerful winter storm brought 1/4 to 3/4 inch of ice accumulation to central Illinois. Areas along and north of I-72 were most impacted, with widespread tree damage and power lines down. Increasing winds over the next couple days brought down additional power lines, due to the weight of the ice. Approximately $2 million damage was reported.