Is Today The Longest Day Of The Year 2024. The summer solstice marks the official start of astronomical summer and the longest day of the year. The midnight sun is a natural phenomenon that occurs in regions near the earth's poles, notably in the arctic and.

This also marks the longest day and shortest night of the. The first day of what’s projected to be an unusually hot summer, the longest day of the year and the summer solstice all arrive thursday, june 20.