First Official Day Of Summer 2024 Canada. No world body has designated an official day to start each new season, and different schools of thought or traditions define the seasons in. The summer solstice is the first day of astronomical summer, although the more logical metrological summer begins december 1st / june 1st (depending on hemisphere).

When is the first day of summer in 2024? Welcome to the first official day of fall in the northern hemisphere, and a happy spring to readers residing below the equator.