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Summer begins on the solstice on 21st or 22nd of June and ends on the autumnal equinox 21st or 22nd of September.

Winter begins on the Winter Solstice on December 21st or 22nd and end on the vernal equinox, which is March 21st or 22nd.

This pertains to the Northern hemisphere. In the southern hemisphere, the dates remain the same but the season is switched.

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Q: What is the legal calendar year for winter and summer months to start and end?
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When are the official seasons of the year?

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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Yes, you will have to follow the legal process which starts by making a name change petition and filing it with your local county court clerk's office. You also must be a resident of where you are living for at least 6 months.


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There is no official date for autumn that carries any legal sanction like the days, months, and years that are the official/legal units of time. The World Meteorological Organization designates September 1 local time as the first day of the climatological autumn season. The International Astronomical Union designates the Autumnal Equinox as the beginning of the astronomical autumn season. In 2010, this falls on September 22 across most of North America and September 23 across Europe and Atlantic Canada. The astronomical seasons have been picked up and heavily promoted by the mass media, educators, and calendar makers. In fact though, the conventional astronomical reckoning has no more official status than any other method of determining seasonal change. The ecological autumn season begins locally whenever the leaves of deciduous trees change colour and begin to fall to the ground. The timing of this varies from one region to another and can even shift from one year to the next.


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