First Day Of Summer 2025 Canada Weather. El niño was the key to our winter (or lack thereof) during the past year, but the global pattern is in a state of upheaval once again. Spring starts on march 1, summer on june 1, autumn on september 1, and winter on december 1.

The first day of summer arrives with the solstice this year on thursday, june 20, 2025 at 4:51 p.m. It features all historical weather data series we have available, including the.