Did you know there is a difference between an astronomical and meteorological season? Astronomical seasons are based on the position of the earth around the sun. In the Northern Hemisphere, summer starts on the solstice, around June 21; fall starts on the equinox, around September 22; winter starts on the solstice, around December 22; and spring starts on the equinox, around March 21.
Meteorological seasons are based on temperatures. Summer is June – August; fall is September – November; winter is December – February; spring is March – May.
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Meteorological seasons make it easier for scientists to compare climate data since they are working with whole months and more equal periods of time (90-92 days each season). Since astronomical seasons are based on the position of the earth and sun, the actual day of the equinox or solstice changes year to year.