When Is Summer Starting In Canada 2024. Thursday, june 20 is the official first day of northern astronomical summer for 2024 — summer solstice — which is the longest day of the year for this half of the planet. Fall begins with the autumnal equinox, sunday, september 22, 2024, 8:44 a.m.

Winter begins with the winter solstice, saturday, december 21, 2024, 4:21 a.m. Canada 2024 calendar online and printable for year 2024 with holidays, observances and full moons