In the Northern Hemisphere, the official start of fall is Friday, September 22 at 4:02PM EDT. This day is also called the Autumnal equinox. By definition, Equinox means “equal night”; night and day are about the same length.
Fall is also defined by nights of below-freezing temperatures combined with days of temperatures below 70 degrees Fahrenheit. From Friday on, the temperatures begin to drop and the days start to get shorter than the nights.
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