People clear the snow on a street in New York City, the United States, on Feb. 9, 2017. [Photo/Xinhua]

Nationwide, about 4,000 flights were canceled and 5,700 delayed.

"The roads are dangerous," New York Governor Andrew Cuomo told reporters. "I don't care if you have a four-wheel-drive car and you think you're a super hero ... if you don't have to be out, don't be out."

David Hassan, 50, attested to the ugliness of the weather as he packed up his mobile coffee cart in New York's Times Square.

"I don't like coming out in this weather but I have three kids going to school and I have to work," Hassan said as he prepared for the two-hour trip back to his home in Parsippany, New Jersey.