Winter Equinox 2024 Dates Usa. Spring equinox 19 march, summer solstice 20 june, autumn equinox 22 september, winter solstice 21 december. Winter 2024 starts on saturday, december 21st in the northern hemisphere, with the first day of winter being the shortest daylight day of the year with the earth's axis having.
The times of the solstices mark the beginning of summer and winter. The vernal equinox marks the.