What Is The Last Day Of Summer 2024 Date. Thursday, june 20 is the official first day of northern astronomical summer for 2024 — summer solstice — which is the longest day of the year for this half of the. But why does this happen, and what is the summer solstice?

The summer solstice will arrive in rochester at 4:50 p.m. What is the summer solstice, and when does it happen?