First Day Of Summer 2025 Canada. Thursday, june 20 is the official first day of northern astronomical summer for 2025 — summer solstice — which is the longest day of the year for this half of the planet. Summer begins with the solstice on thursday, june 20, 2025, marking the astronomical first day of summer in the northern hemisphere.
The summer solstice is the day with the most hours of sunlight during the whole year. 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.
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