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“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.

• David Klepper reported from Newport, R.I., and Frank 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 article.