When Does Summer, Fall, Winter, and Spring Begin?

See chart below to see when seasons begin for 2012 and 2013—namely, the summer solstice, fall or autumnal equinox, winter solstice, and spring or vernal equinox.

The four seasons are determined by changing sunlight (not heat!)—which is determined by how our planet orbits the Sun and the tilt of its axis.

    The first day of summer—the summer solstice—is the longest day of the year, the Sun reaches its most northern point in the sky at local noon. After this date, the days start getting shorter. See our First Day of Summer page!
    
    On the first day of fall—the autumnal equinox—day and night are each about 12 hours long (with the actual time of equal day and night, in the Northern Hemisphere, occurring a few days after the autumnal equinox). The Sun crosses the celestial equator going southward; it rises exactly due east and sets exactly due west. See our First Day of Fall page!
    
    The start of winter—the winter solstice—is the shortest day of the year, when the Sun reaches its most southern point in the sky at local noon. After this date, the days start getting longer. See our First Day of Winter page!
    
    On the first day of spring—the vernal equinox—day and night are each approximately 12 hours long (with the actual time of equal day and night, in the Northern Hemisphere, occurring a few days before the vernal equinox). The Sun crosses the celestial equator going northward; it rises exactly due east and sets exactly due west. See our First Day of Spring page!

http://www.almanac.com/content/first-day-seasons

Seasons of 2012:
SPRING EQUINOX  March 20, 1:14 A.M. EDT
SUMMER SOLSTICE  June 20, 7:09 P.M. EDT
FALL EQUINOX  September 22, 10:49 A.M. EDT
WINTER SOLSTICE  December 21, 6:12 A.M. EST

Seasons of 2013:
SPRING EQUINOX  March 20, 7:02 A.M. EDT
SUMMER SOLSTICE  June 21, 1:04 A.M. EDT
FALL EQUINOX  September 22, 4:44 P.M. EDT
WINTER SOLSTICE  December 21, 12:11 P.M. EST
Summer begins each year on June 21 and ends each year on September 22.

 

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