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Greg Grove's avatar

I've seen climatologists or meteorologists define "winter" as Dec 5 - March 5, because ~Jan 20 is the low point for long-term temperature average.

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Greg Grove's avatar

Strictly speaking we are at the end of astronomical winter :)

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Mark Bonta's avatar

I always dated the beginning of spring, N. Hemisphere, from the exact time of the vernal equinox, which is now on March 20, and some years, including next year, on the 19th. Farmer's Almanac: https://www.farmersalmanac.com/spring-equinox-first-day-spring.

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