Shortest Day Of 2025 Uk. This makes it both a time of celebration and reflection: The shortest day of the year is not until december 21, which is known as the winter solstice.

Winter solstice takes place on december 21, 2025, in the northern hemisphere and on june 20, 2025, in the southern hemisphere. The astronomical calendar, which is based on the natural rotation of the earth around the sun, holds that winter starts on the day of the winter solstice, december 22, and ends on march 20 2025.