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Though many people assume spring begins on March 21, the first day of spring, or the vernal equinox, actually varies year to year, and falls on March 20 in 2013.
First Day of Fall? In the Northern Hemisphere, the fall equinox marks the first day of fall (autumn) in what we call astronomical seasons. There's also another, more common definition of when the seasons start, namely meteorological definitions, which are based on average temperatures rather that astronomical events.