And more than 275 flights were canceled, mostly in Chicago, Denver, Houston and Dallas, aviation data company FlightAware said. The number is in line with a typical travel day and much improved from Sunday's 700 cancellations. There are usually more than 30,000 daily flights in the United States.
Delta Air Lines said a taxiway that may have frozen over was suspected in an accident at Detroit Metropolitan Airport: An Atlanta-bound jetliner slid onto the grass, but no one was hurt.
While the cold will continue to harass people, there's no major precipitation on the horizon through the end of the week, Curtis said.
"It will give people some time to recover from this," she said.
Meanwhile, flooding in Indiana and Ohio, parts of which got 3 to 5 inches of rain over the weekend, caused no reported injuries but forced small-scale evacuations and closed several roads. Flooding in southwestern Pennsylvania damaged about 300 toys a Salvation Army set aside for needy families, but churches and other charities donated replacements.
On Monday, some 25,000 customers were without power in New York's St. Lawrence County, where almost 2 inches of ice fell Sunday, coating tree limbs and power lines.
The winter weather was far from nationwide, though. Record high temperatures were reached in some Mid-Atlantic states this weekend, but forecasts called for drops back to the mid-30s.
Associated Press writers Mary Esch in Albany, N.Y., Holly Ramer in Concord, N.H., Bruce Shipkowski in Trenton, N.J., Ken Miller in Oklahoma City, David Goodman in Detroit, Rick Callahan in Indianapolis, Steve Karnowski in Minneapolis and Scott Mayerowitz in New York City contributed to this report.