When Is Summer 2025 Start Date. 2025 is a banner year. Please check novaconnect for start dates and census dates for variable duration (dynamic) sessions.
In 2025, the summer solstice will occur on june 21, at 02:42 gmt in the northern hemisphere, and on december 21, 2024 at 09:20 gmt in the southern hemisphere. Summer 2025 starts on friday, 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 directiion back.
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