When Is Winter 2025 In Canada Start Date. Seasons divide the year into four distinct periods of time named spring, summer, autumn/fall, and winter. Currently, a strong jet stream in the pacific is helping to push a warmer pattern over.

The summer solstice signals the beginning of astronomical summer and the winter solstice signals the beginning of winter. 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.