Scattered snow showers are expected Tuesday evening, possibly heavy at times, into Tuesday evening, the weather service said.
The snow could reduce visibility and coat the ground, including roadways and parking lots.
Temperatures will initially be above freezing, especially near the coast, allowing the snow to melt on some surfaces. But temperatures were expected to fall rapidly in the evening, causing any wet snow and slush to quickly refreeze.
Anyone traveling Tuesday evening is urged to use extra caution.
The warning is in effect for southeastern New York, southern Connecticut and Northeast New Jersey.
Overnight lows will hit the teens. Christmas will be sunny and cold, with high temperatures near 25 degrees.
The forecast for Christmas Day calls for mostly sunny skies and a high between 24 and 26 degrees.
A chance of snow showers returns on Thursday, mainly before 3 p.m., with highs in the mid to upper 30s.
Friday should be mostly sunny with a high of 35 before warming up Saturday to 46 degrees under sunny skies.
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