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Autumn or Fall is one of the four temperate seasons. Autumn marks the transition from summer into winter, in September (Northern Hemisphere) or March (Southern Hemisphere) when the arrival of night becomes noticeably earlier.
In North America, autumn is usually considered to start with the September equinox. In traditional East Asian solar term, autumn starts on or around August 8 and ends on about November 7. In Australia, autumn officially begins on March 1 and ends May 31. According to United States tradition, autumn runs from the day after Labor Day (i.e. the Tuesday following the first Monday of September) through Thanksgiving (i.e. the fourth Thursday in November), after which the holiday season that demarcates the unofficial beginning of winter begins.