By Cassandra Vinograd / NBC News
February 14, 2016

Bitter temperatures flirted with record lows on Sunday as “life-threatening” conditions put millions across the country in a deep freeze for Valentine’s Day.

More than 38 million people from the Plains into the Midwest and East Coast were under winter-storm warnings or advisories overnight, according to The Weather Channel.

The coldest air mass of the winter brought the thermometer down to minus 6 degrees overnight in Minneapolis, while New Yorkers were urged to take “extreme precautions” against wind chill.

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