When Does Winter 2024 Start In Usa. The 2024 winter solstice — the precise moment when the sun appears farthest south in the sky — is at 4:20 a.m. The 2024 december solstice takes place on december 21, at 9:21 utc.

So, what is the winter solstice and why does it happen? In 2024, the first day of winter is saturday, december 21.