When Is The First Day Of Summer 2024 Usa. It is the longest day of the year that marks the arrival of the summer season. The last time the solstice arrived earlier than this was in 1796, when it occurred at 17:45 utc on june 20.

Each season brings different weather, hours of light,. The first day of summer this year is thursday, june 20, 2024, per the almanac.