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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.
In the United States and the rest of the northern hemisphere, the first day of the winter season is the day of the year when the Sun is farthest south (on December 21 st or 22 nd). This day is known as the Winter Solstice.