Millions in the United States remain without power or transportation in the wake of Sandy, which caused dozens of deaths and billions of dollars of damage along the country's East Coast.
The worst damage was in the New York area, the most densely populated stretch of land in the country.
At least 18 people were killed in the city, according to Mayor Michael Bloomberg.
The storm also caused widespread damage in neighbouring New Jersey, where homes and businesses along the coast sustained extensive damage.
More than two million households in New Jersey lost power - twice the impact of Hurricane Irene, the storm which battered the East Coast last year.
Nationwide, some eight million homes were without electricity, and more than one million people were still under evacuation orders.
More than 40 storm-related deaths were reported across the states of Massachusetts, Maryland, Connecticut, New Jersey, Pennsylvania and West Virginia. Sandy had already killed more than 60 people in the Caribbean in the past week.
Federal government offices in Washington, which was spared the worst of the storm, were closed for a second day on Tuesday, and schools up and down the coast remained closed.
Parts of New York, New Jersey and Connecticut have been declared "disaster zones", meaning more relief funds will be available to help those states get back on their feet.
In West Virginia, up to 60cm of snow fell in mountainous areas, and a blizzard warning for more than a dozen counties remains in effect until Wednesday afternoon.
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