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The seasons have no official dates that carry any legal sanction like the days, months, and years that are the official calendar based units of time. Calendar based dates used by the World Meteorological organization to mark the climatological change of seasons (March 1, June 1, September 1, and December 1) are conventional for the meteorological profession but have limited application outside meteorology. Dates used by the International Astronomical Union using the solstices and equinoxes to define their four season model have been picked up and strongly promoted by the mass media and calendar makers for public comsumption. In fact, the conventional astronomical reckoning has no more official status than any other method of determining seasonal change. Many ecologists use a six season model that uses not the calendar, but changes in animal and plant activity to define seasonal changes. The dates that define the hibernal (winter), prevernal (pre-spring thaw), vernal (spring growing season), estival (high summer), serotinal (late summer), and autumnal (fall) seasons are not fixed on the calendar because they vary from one climate region to another and can fluctuate from one year to the next. Obviously no "official" dates can be applied here either. In conclusion, dating seasonal changes are matters of meteorological, astronomical, and ecological conventions which all differ from each other and are not the product of official laws or regulations.

Original answer and first edit by Chris_Carss. Source Wikipedia.

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Q: When are the official seasons of the year?
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