First Day Of Winter 2025 Usa Time. Daylight saving time for 2025 will begin at 2 a.m. 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 crosses the celestial equator going southward; The data correspond to the seasons of the year 2025.