The frigid weather is part of cold snap that could bring more snow toward the end of the week, said Kevin Donofrio, a meteorologist with the weather service.
Parts of the Midwest had their coldest Christmas on record.
Forecasters say a Christmas storm dumped a record amount of snow on the Pennsylvania city of Erie and surrounding areas.
In North Granby, 4.8 inches of snow was reported.
The cold comes after parts of CT saw upwards of five inches of snow on Monday - a rare white Christmas, according to forecasters.
The city of Erie issued a snow emergency, citing "dangerous and impassable" roads.
State police and the Pennsylvania Department of Transportation are also urging motorists to avoid travel, citing poor visibility and deteriorating conditions.
Our next weather system moves in Christmas eve night.
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Erie's 92 inches of snow this December make this the snowiest single month on record there.The previous record, from December 1989, was 66.9 inches.
A blizzard warning was issued Monday for portions of ME and New Hampshire, with forecasters saying snow of up to 10 inches (25 centimeters) and wind gusts up to 50 miles per hour (80 kph) could make travel "dangerous to impossible".
Christmas Day weather caused seven flight cancellations and 235 delays across the US on Monday, mostly in Detroit, Chicago and Boston, according to flight tracking site FlightAware.
Erie averages about 101 inches of snow per year, The Weather Channel noted. Last year, the high on Christmas reached 39 degrees and the low dipped to 32. A storm system that swept from Nebraska through Iowa dropped around 2 inches of snow on Chicago, the weather service said.
Chicago's O'Hare International Airport was reporting just six cancelations and average delays of only 15 minutes around noon Monday.
And more snow is expected to fall through Wednesday evening.
JetBlue Flight 50 from Savannah, Ga., briefly skidded when it landed about 7:15 p.m. Monday, authorities said. No one was injured, officials said.