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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.
The first day of spring, summer, fall and winter can either be defined using astronomical events like solstices and equinoxes, or they can be determined based on meteorological factors, average temperatures. In the USA and some other areas in the Northern Hemisphere, the Summer Solstice marks the first day of summer. However, the official date for the first day of summer varies depending on the country's climate. Topics: Astronomy, Seasons, December, June, Sun, Solstice. The Winter solstice in the Northern Hemisphere is in December, while in the Southern Hemisphere, it's in June. more.