What Is The First Day Of Summer 2025 Usa. 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. This is the longest day of the year and marks the start of summer in the northern hemisphere.
2025, 2026, 2027, 2028, 2029, 2030, 2031, 2032, 2033, 2034 and 2035. Summer begins with the solstice on friday, june 20, 2025, marking the astronomical first day of summer in the northern hemisphere.
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