When Does Spring Begin!!
Astronomically speaking, the spring equinox falls on March 20, 2016 at 6:29 a.m. (EDT). This equinox, also known as the vernal equinox, occurs when the Sun crosses the celestial equator on its way north along the ecliptic.
Meteorologically speaking, however, in the Northern Hemisphere the official spring season always begins on March 1 and continues through May 31. Summer begins on June 1; autumn, September 1; and winter, December 1.
Weather scientists divide the year into quarters this way to make it easier to compare seasonal and monthly statistics from one year to the next. The meteorological seasons are based on annual temperature cycles rather than on the position of Earth in relation to the Sun, and they more closely follow the Gregorian calendar. Using the dates of the astronomical equinoxes and solstices for the seasons would present a statistical problem because these dates can vary slightly each year.