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In 2015, fall begins on September 23rd (at 08:20 UTC) for countries in the Northern Hemisphere (United States, Canada). Fall-Autumn Activities and Games. In 2015, fall begins on March 20th (22:45 UTC) for countries in the Southern Hemisphere (parts of South America, parts of Africa, Australia, and Antarctica).
The autumnal equinox occurs on September 22 or 23, and the season continues until the winter solstice on December 21 or 22. The winter solstice has the longest night and the shortest amount of daylight of the year. Autumn is also known as fall because it is the season in which leaves fall from deciduous trees.