Some school systems canceled classes on Monday, including in Boston, Providence, R.I., and on Long Island, while some local governments told nonessential workers to take the day off.
Long Island was slammed with as much as 2½ feet of snow, which shut down roads, including the Long Island Expressway, where many people had been stranded overnight during the worst of the storm. A 27-mile stretch of the expressway was closed Sunday but reopened in time for the Monday morning commute.
Gov. Andrew Cuomo said more than a third of all the state's snow-removal equipment was sent to the area, including more than 400 plow trucks and more than 100 snowblowers, loaders and backhoes.
"The massive amount of snow left behind effectively shut down the entire region," he said.
Utility crews, some brought in from as far away as Georgia, Oklahoma and Canada, raced to restore power. In hardest-hit Massachusetts, officials said some of the outages might linger until Tuesday.
Boston recorded 24.9 inches of snow, making it the fifth-biggest storm on record in the city. The city appealed to the state and private contractors for more front-end loaders and other heavy equipment to clear snow piles clogging residential streets.
Rain and higher temperatures in the forecast for Monday could help melt the mess but also put extra weight on snow-covered roofs, leading to collapses. Officials said people should try to clear flat or gently sloped roofs — but only if they could do so safely.
"We don't recommend that people, unless they're young and experienced, go up on roofs," said Peter Judge, spokesman for the Massachusetts Emergency Management Agency.
Officials warned of the danger of carbon monoxide poisoning.
In Boston, two people died Saturday after being overcome by carbon monoxide while sitting in running cars, including a teenager who went into the family car to stay warm while his father shoveled. The vehicles' tailpipes had become clogged with snow.
Klepper reported from Newport, R.I., and Eltman reported from Patchogue, N.Y. Associated Press writers Stephen Singer in Manchester, Conn., Mike Melia in South Windsor, Conn., John Christoffersen in Fairfield, Conn., and David Sharp in Portland, Maine, contributed to this report.