Winter Solstice 2025 Usa Time. Est, according to the astronomical definition based on the sun's position. Winter solstice is the shortest day of the year in the northern hemisphere, occurring on dec.

In 2025, it falls on saturday, december 21, at 4:21 a.m. Summer begins with the summer solstice, thursday, june 20, 2025, 4:51 p.m.