First Day Winter 2025 Dates. Winter solstice 2025 (beginning of astronomical winter) on the day of the winter (december) solstice, the sun passes through the southernmost point of the ecliptic, that is, as far as. The first day of winter in the northern hemisphere is marked by the winter solstice, which occurs on saturday, december 21, 2024, at 4:21 a.m.
Online calendar of holidays and days off in united states for the winter of 2025. May 5, 2025, to aug.