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The official first day of the astronomical winter as mandated my the International Astronomical Union is December 21/22, 2011 (depending on the time zone) for the northern hemisphere and June 21, 2012 for the Southern Hemisphere.

The official first day of the climatological winter as mandated by the World Meteorological Organization is always December 1 local time for the northern hemisphere and June 1 local time for the southern hemisphere.

Canada and the USA customarily observe the astronomical winter while Australia and New Zealand observe the climatological winter. Preference for either of these methods varies in other western countries. Many east Asian countries use lunar dates to determine the beginning of winter and the other seasons.

In temperate climates, an ecological winter can be determined that starts with the first regular snowfalls or when most hibernating animals have retreated to their winter quarters.

It depends on what day it is?
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13y ago

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