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December Solstice Marks The Start Of Winter In The Northern Hemisphere

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The winter solstice marks the start of the astronomical winter in the Northern Hemisphere (Credit: Jon Bunting/ CC-BY-SA-2.0/ Flickr)

With a large part of the US currently under a winter storm warning, it may appear that the chilly season is upon us. But while meteorologists consider December 1 the start of the Northern Hemisphere winter, the astronomical first day of winter is December 21.