Shortest Day Winter Solstice 2025. The december solstice marks the shortest day of the year in the northern hemisphere and longest day in the southern hemisphere. In 2025, the winter solstice occurs on saturday, december 21 at 4:20 a.m.

The winter solsitice is both the shortest day of the year and also the longest night. This is the shortest day of the year with the fewest hours of.