As the holiday season is in full swing on Long Island, so are frigid temperatures and possible flurries.

The National Weather Service said Friday morning’s temperatures reached lows in the teens due to an arctic air mass, the coldest on Long Island since March.

Before you write up your holiday list of to-do or attend a gathering, experts say to brush up on tips to keep yourself, your home and your family safe in cold conditions.

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If you need to be outside, cover as much exposed skin as possible, the National Weather Service says. Head inside if you start to lose feeling in any extremity.

Wear a hat. Mittens, snug at the wrist, are better than gloves, the NWS says. Cover your mouth to protect your lungs from extreme cold.

The service also warns it’s important to stay hydrated,

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