When Winter Starts 2024. — affecting snowfall, water supplies, winter sports, spring allergies, summer. When does winter 2024 start and when is the solstice?

This is when the winter solstice, or the shortest day of the year, occurs. 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.