when does summer start 2025

Summer in the Northern Hemisphere in 2025 officially starts on June 20. This date marks the summer solstice, the longest day of the year, when the Earth's North Pole is tilted most directly toward the Sun. Specifically, in 2025, the summer solstice will occur on June 20 at 10:42 p.m. Eastern Time. This event officially signals the beginning of astronomical summer, which lasts until the autumnal equinox around September 22 or 23. Meteorologically, summer is often defined as starting on June 1 and lasting until August 31, but the astronomical definition tied to the solstice is more precise for the start of summer. So for the year 2025, summer starts on June 20 according to astronomical reckoning.