First Day Of Winter 2024 Usa Dates. In different time zones, the date of the solstice can differ by a day, so it is important to indicate your exact location. It marks the northern hemisphere’s shortest day (first day of winter) and southern hemisphere’s longest.

Yep, it only lasts a brief moment, not a whole day, as many believe!. The 2024 december solstice takes place on december 21, at 9:21 utc.