Starts around September 22 or 23 . Like the spring equinox, the sun crosses the equator again, signaling the transition into cooler months.
The next time someone asks you, "When does winter start?" you can confidently reply: "Astronomically on December 21 or 22, but meteorologically on December 1. Which system would you like to use?" when do the four seasons start and end
Seasons shape what we eat, how we work, where we travel, and even how cultures mark the year. But “when” seasons start depends on which definition you use — astronomical, meteorological, or cultural — and on where you are on Earth. This post explains each system, why they differ, and what those differences mean for weather, ecosystems, culture, and everyday life. Starts around September 22 or 23