The winter solstice occurs on December 21, 2024, in the Northern Hemisphere.
The solstice is the instant when the Sun reaches its farthest apparent position south of the celestial equator, directly over the Tropic of Capricorn. In 2024, that astronomical moment fell on December 21 in the Gregorian calendar, although the exact local date and time can vary by time zone.
It produces the Northern Hemisphere’s shortest day and longest night, while the Southern Hemisphere experiences its summer solstice. After the December solstice, daylight gradually increases in the north, even though the coldest winter weather often arrives later because land and oceans release stored heat slowly.
A common mix-up is treating the solstice as an entire day rather than a precise astronomical event. Calendar dates can also differ: the event may occur on December 20, 21, or 22 depending on the year, time zone, and leap-year timing.