The National Weather Service issued a freeze warning at 1:23 a.m. on Monday valid for Tuesday between 1 a.m. and 9 a.m. for Manhattan, the Bronx, Staten Island and Brooklyn as well as Westchester, Suffolk and Nassau counties.

The weather service adds, "Sub-freezing temperatures between 30 and 32 degrees expected."

"Frost and freeze conditions could kill crops and other sensitive vegetation," adds the weather service. "Take steps now to protect tender plants from the cold."

Freeze watch or warning - this is what it means

Freeze warnings are issued from May to October (but can be extended if necessary), when low temperatures are expected to be 29-32 degrees. If there is a potential for temperatures to fall into these thresholds, a freeze watch may be issued a few days ahead of time.

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