Summer Time 2025 Usa Date

Summer Time 2025 Usa Date. The first official day of summer astronomically for 2025 is thursday, june 20, which is when the northern hemisphere has the longest day of the year, according. 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 furthest tilt and begins to change directiion back.

That also happens to be the summer solstice, aka the start of summer. Edt (2051 gmt), marking the longest day in the northern hemisphere.