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Winter Arrives

by Weatherboy Team Meteorologist - December 21, 2017

Winter begins on December 21, 2017.
Winter begins on December 21, 2017.

While meteorological winter brought the unofficial start to the season on December 1, today marks the first official day of the winter season. Thanks to the tilt of the Earth’s axis, today is either the longest or shortest day of the year. In the Northern Hemisphere, “peak” sunlight usually occurs on June 20, 21, or 22 of any given year at the summer solstice. In the Southern Hemisphere,  peak sunlight arrives today, while the opposite happens here in the Northern Hemisphere. Beyond today, the days will begin to get longer until Summer Solstice arrives. The change in seasons is completely based on the tilt of the Earth and has nothing to do with the distance to the sun. In just a few weeks in 2018, the Earth will be the closest to the sun on January 3.


The tilt of the Earth's Axis is responsible for the change in seasons. Image: NWS
The tilt of the Earth’s Axis is responsible for the change in seasons. Image: NWS

The word “winter” comes from the Germanic wintar which in turn is derived from the root wed meaning ‘wet’ or water’, and so signifying a wet season. In Anglo-Saxon cultures, years were counted by the winters, so a person could be said to be “2 winters old”.

Winter ’17-’18 officially begins at 9:28pm ET.

 

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