Temperatures Sunday morning ranged from -1 in Central Park to -10 in parts of Northern Westchester, Putnam and Dutchess.
Nyack reported a temperature of -3 at 8:30 a.m. and West Haverstraw zero.
Greenburgh and White Plains also reported -3 degree readings while the 8:30 a.m. temperature in Yorktown was -10.
Farther north, the 8:30 a.m. temperature in Albany was -13.
The -1 reading in Central Park made for the coldest Valentine's Day in New York City in 100 years and the second-coldest ever.
The bitter cold temperatures, couple with strong, gusty winds, are resulting in life-threatening wind chills as low as 20 to 30 degrees below zero.
Hazards include extreme and dangerous cold; frozen pipes, frostbite and hypothermia.
The National Weather Service advises residents to wear layers, including hats and gloves; bring pets indoors; and to heat homes safely and only with indoor approved devices.
The mercury will rise to the upper 40s and low 50s Tuesday, but snow, ice and rain may strike the region on Monday night into Tuesday, according to the National Weather Service.
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