Winter Solstice 2024 Eastern Time. The winter solstice, which marks the first day of winter 2024, occurs on saturday, december 21, 2024 at 4:21 a.m. Winter solstice — is the day of the year when the sun passes through the southernmost point of the ecliptic in the northern hemisphere (or through the northernmost point in the southern.

When is the winter solstice? Date and time for solstices and equinoxes.