The storm, spawned by the collision of two weather systems, affected more than 40 million people. So far, only a handful of people have died, including several elderly people who died of heart attacks while shoveling snow. Several people, including a boy in Boston, have died from carbon monoxide poisoning, while seeking refuge from the cold in cars. By Sunday morning, more than 300,000 customers remained without power, down from over 650,000, mostly in southeastern Massachusetts and on Cape Cod, in Rhode Island and on the eastern Connecticut shore. NStar, which provides much of Massachusetts with electricity and natural gas, said it was still too dangerous to send in crews to many area. Flooding during the storm also caused extensive damage to the electric infrastructure in Massachusetts.

Getting rid of all the snow is now the most pressing concern.

President Obama declared a state of emergency in Connecticut on Sunday, ordering federal aid to supplement local emergency response efforts. Calling the storm “historic,” Gov. Dannel P. Malloy, praised the president’s decision, and pressed residents to stay out of the way of emergency crews until the snow was cleared.

“While the ban on travel has been lifted, we are continuing to urge residents to stay off the roads, if at all possible,” Mr. Malloy said in a statement. “This is particularly true for tractor-trailers. Every time someone gets stuck, it is preventing plows from doing their jobs.”

For some, moving at all has proved nearly impossible. In Old Lyme, Conn., Beth Hamilton and her husband, Matthew Barrett, still had no power and were cooking and warming their home with a wood-burning stove. Hacking through all the snow has been difficult.