When Does Summer Start 2025 Canada Nz. Winter starts at the moment when the sun is farthest south: This is the first day of astronomical summer and occurs as.
What exactly is the summer solstice? Summer 2025 starts on thursday, 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.