For , summer 2025–2026 begins on: December 21, 2025 (most years, though occasionally December 22 depending on the year and time zone).
If you meant (end of year), the same December solstice applies. For , summer 2025–2026 begins on: December 21,
In the Southern Hemisphere, summer officially starts on the (between December 20–23). summer 2025–2026 begins on: December 21
For , summer 2025–2026 begins on: December 21, 2025 (most years, though occasionally December 22 depending on the year and time zone).
If you meant (end of year), the same December solstice applies.
In the Southern Hemisphere, summer officially starts on the (between December 20–23).