A season is a period of the year that is distinguished by special climate conditions. The four seasons—spring, summer , fall, and winter —follow one another regularly. Each has its own light, temperature , and weather patterns that repeat yearly. In the Northern Hemisphere , winter generally begins on December 21 or 22. This is the winter solstice , the day of the year with the shortest period of daylight. Summer begins on June 20 or 21, the summer solstice , which has the most daylight of any day in the year. Spring and fall, or autumn, begin on equinoxes, days that have equal amounts of daylight and darkness. The vernal, or spring, equinox falls on March 20 or 21, and the autumnal equinox is on September 22 or 23. The seasons in the Northern Hemisphere are the opposite of those in the Southern Hemisphere . This means that in Argentina and Australia, winter begins in June. The winter solstice in the Southern Hemisphere is June 20 or 21, while the summer solst
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