When Is Winter Solstice 2025. 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 sun then appears at its lowest elevation at noon for observers in the northern hemisphere.
The times of the equinoxes mark the beginning of spring and fall. Similarly, when there is summer solstice.