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In temperate and sub-polar regions, four seasons based on the Gregorian calendar are generally recognized: spring , summer , autumn ( fall ), and winter . Ecologists often use a six-season model for temperate climate regions which are not tied to any fixed calendar dates: prevernal, vernal, estival, serotinal, autumnal, and hibernal. Amazon Music Embed Widget - album Winter Spring Summer or Fall (Original Motion Picture Soundtrack) Remi (Jenna Ortega) has her future figured out - Harvard in the fall , making her parents proud, and following the path she’s always expected to take. Then sh... Learn how seasons are defined astronomically and meteorologically, and how they vary in different hemispheres and regions. Find out the exact dates and times for spring , summer , fall , and winter in your city.