And if you're outside for a long period of time, it could be dangerous.
People were bundling up across the Tri-State area, doing their best to stay warm as they troll trudge through the day.
The seemingly endless winter dumped a half a foot snow on the ground in parts of the South, Mid-Atlantic and Northeast Sunday into Monday, and those areas braced Tuesday morning for something even more unusual in March: a blast of arctic air that was expected to send temperatures plummeting.
Washington has recorded a low temperature in the single digits in March only two times in recorded history - and the previous two were in 1872 and 1873, according to the National Weather Service. Other parts of the Northeast could also see record lows for the month of March and much of the South will start Tuesday below freezing.
Blame it on a return of the "polar vortex."
"That is the buzzword this winter, the polar vortex. That cold air just kind of migrates around the poles and the extreme northern latitudes all the time," said Jim Lee, meteorologist in charge at the National Weather Service in Sterling, Va. "The jet stream enables that colder air to move down the East Coast."
Monday's snowstorm followed a pattern that's become routine. Schools and government offices were closed. Federal workers stayed home - the fourth weather-related shutdown this season. Young adults gathered on the sloppy, slushy National Mall for a semi-organized, afternoon snowball fight.
Tourists, who flock to the nation's capital 365 days a year, were seeking out whatever activities they could find.
The National Air and Space Museum was the only Smithsonian institution open, and it drew a crowd. Among the visitors were Russ Watters, 60, of St. Louis, and his 14-year-old son, Seth, who was touring Washington with his 8th-grade class.
"We're trying to find stuff that's open, so this is open," Watters said.
The storm had a major effect south of the Mason-Dixon line. Governors declared states of emergency in Virginia and Tennessee, where there were hundreds of traffic accidents and tens of thousands of power outages. Nearly 3,000 flights were canceled Monday.
In Falls Church, Va., daredevils took advantage of another snow day by sledding down a steep hill behind an elementary school. Maya Luera, 11, said she wouldn't be so happy in June, when the school year will be extended because there's been so much snow.
"I'm more of a summer person, so I'd rather have more free time in the summer than the winter," she said.
(The Associated Press contributed to this report)