Winter Solstice 2025 Uk Time. The day in our calendar that marks the first day of winter usually refers to the astronomical seasons which are a result of the earth's axis and orbit around the sun. In 2025, these are the astronomical dates and times for the start of each season:
Spring equinox 20 march, summer solstice 21 june, autumn equinox 22 september, winter solstice 21 december. Winter 2025 starts on sunday, 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 reached its furthest tilt away from the sun and.