Bloomberg urged parents to make sure their children have extra sweaters since some schools may not have heat.
The long commute between boroughs has also been eased, with Metropolitan Transportation Authority employees working around the clock to restore 80 percent of the New York subway system. All subway lines except the G train are now running to some extent, according to the MTA website.
"This is a major step forward in the resumption of regular subway service in New York City," Cuomo said. "Once again, subway customers have a direct link between Brooklyn and Manhattan, giving them a fast and reliable way to get to their jobs, their schools and their homes."
The subway returned to limited service Thursday after Sandy crippled transit between the five boroughs on Monday, prompting the Metropolitan Transit Authority to call it the most severe flooding the subway system has seen in 108 years. With Manhattan-Brooklyn subways out of service, commuters waited in long lines to take shuttle buses across the East River to work.
Bloomberg urged people to prepare for a busy commute to work.
New Jersey Transit's Northeast Corridor, which extends from Trenton to New York Penn Station, was operational on Friday after a week-long service suspension.
Three commuter lines, including the Raritan Valley line, New Jersey Coast line, and the Main/Port Jervis line are offering limited service.
The Atlantic City Line resumed normal service today, operating between Atlantic City and Philadelphia.