First Day Of Winter 2025 Canada Date. 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. Undergraduate programs other than engineering and specified architectural science classes classes begin for undergraduate programs (other.

However, as you can see below the 21st is by far the most common. First day of ramadan ;