Winter Solstice 2024 Southern Hemisphere Time. The first day of winter in the northern hemisphere is marked by the winter solstice, which occurs on saturday, december 21, 2024, at 4:21 a.m. The winter solstice 2024 will mark the longest night of the year in the northern hemisphere.

It marks the northern hemisphere’s shortest day (first day of winter) and southern hemisphere’s longest day. In the northern hemisphere this date falls in december every year.