At least 16 deaths -- mostly in traffic accidents -- have been attributed to the storm, USA Today reported Saturday, as the eastern portion of the United States prepared for a return of sub-freezing temperatures Monday -- after a brief break during the weekend, AccuWeather.com forecaster Paul Pastelok said.
"Temperatures Monday that start near mild levels in the 40s and even near 50 degrees in some locations will crash below freezing as the day wears on," Pastelok said.
Environment Canada said the Toronto area can expect snow and freezing rain starting Sunday night.
Saturday began with single-digit temperatures along the East Coast but AccuWeather.com said warming Sunday will give folks from Chicago to Boston a chance to dig out snowbound driveways and sidewalks.
"The snow was absolutely insane and totally non-stop," Ford Fischer of Boxtown, Mass., told CNN.
Fischer and his neighbors were urged to make hay Saturday with their snow clearance plans due to a chance of rain Sunday night. The rain and snow will combine to create slush, which could be heavy enough to collapse a roof, the Boston Globe reported.
Monday's arctic blast would then flash-freeze the remaining slush into solid ice.
The returning bitter cold will be accompanied by another round of snow, especially in the Midwest.
"Blizzard conditions may develop from eastern Ohio to West Virginia, western Maryland [and] western Pennsylvania Sunday night and Monday, and in western New York Monday into Tuesday," AccuWeather.com senior meteorologist Dale Mohler said.
Schools in Minnesota, where parts of the state face three straight days of subzero temperatures for highs, were ordered not to open Monday by Gov. Mark Dayton.
Travelers were warned to expect delays on the highways and airports nationwide.