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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.
How you define the first day of winter depends on whether you are referring to the astronomical or meteorological winter. The day in our calendar that marks the first day of winter usually refers to the astronomical seasons which are a result of the Earth's axis and orbit around the sun. However, at the Met Office we often use a meteorological definition of the seasons. Let's take a brief overview of the difference.