First Day Of Summer 2025 Usa Schedule. Winter begins with the winter. Seasons divide the year into four distinct periods of time named spring, summer, autumn/fall, and winter.
Registration begins for summer 2025: Summer 2025 starts on friday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth’s axis having reached its furthest tilt and begins to change.