Snow continued to fall into Tuesday night with roads throughout the area remaining slick.
At 10 p.m., snow accumulation totaled 6.5 inches in Geneva, 7 inches in Elgin, 9.1 inches at O'Hare, 6.5 inches in Wheaton, 8.6 inches in Oak Brook, 8.2 inches in Elk Grove, 8.3 in Batavia, 5.1 inches in Gurnee, 7.1 in Glen Ellyn and 8.2 inches at Midway.
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A winter weather advisory extends through midnight, when snowfall is expected to slow considerably and winds are supposed to pick up.
"It'll continue to snow through early evening, but then it should taper off to flurries by midnight," said Jim Allsopp, a meteorologist with the National Weather Service.
Snowfall accumulated enough today to say that it's the biggest snowfall since the blizzard in 2011.
Almost 1,200 flights were canceled Tuesday at O'Hare International Airport and Midway Airport.
Flights at O'Hare are currently delayed about 20 minutes with 930 cancellations throughout the day.
At Midway, Southwest is experiencing three hour delays and 250 flights have been canceled throughout the day.
Anyone with a flight Wednesday is encouraged to visit the airline's websites to check on flight statuses.
Winds are expected to pick up this evening with north winds blowing 15 to 20 miles per hour with gusts up to 35 mph, Allsopp said.