When Is The Shortest Day 2025. The shortest day of the year, also known as the winter solstice, occurs on december 21st or 22nd in the northern hemisphere. The shortest day can occur on december 20, 21, 22, or 23.

The winter solstice marks the shortest day of the year in the northern hemisphere when the sun appears at its most southerly position, directly overhead at the faraway tropic of capricorn. What is the summer solstice?