What Day Does Winter Start 2025. Fall starts at the moment when the sun is directly over the equator, going from north to south: The winter solstice heralds the astronomical start of winter and marks the day with the fewest hours of daylight for the year.
(in the southern hemisphere, it is around june 20 or 21.) this date is considered to be the. The season change dates are based on the spring and fall equinoxes as well as the summer and winter solstices.
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