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NEW YORK, NY - DECEMBER 10:  Children walk down Sixth Avenue wearing t-shirts thanks to 60 degree weather on December 10, 2015 in New York City. Temperatures have been unusually warm despite the winter season.  (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - DECEMBER 10:  Children walk down Sixth Avenue wearing t-shirts thanks to 60 degree weather on December 10, 2015 in New York City. Temperatures have been unusually warm despite the winter season.  (Photo by Andrew Burton/Getty Images)

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Where is winter?

CNN's Jennifer Gray explains why parts of the U.S. are expecting such a warm Christmas this year.

Where is winter?

CNN's Jennifer Gray explains why parts of the U.S. are expecting such a warm Christmas this year.