Winter 2025 Calendar. These dates may be modified as official changes are announced, so please check back. Based on the outlook discussion, here’s the early winter 2024/25 outlook.

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. Term 1, generally from early september to late december (although some studies begin in august), and term 2,.