Usa 2024 Summer Starting Date. Summer 2024 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. The season change dates are based on the spring and fall equinoxes as well as the summer and winter solstices.
Seasons divide the year into four distinct periods of time named spring, summer, autumn/fall, and winter. The true solstice will arrive in the northern hemisphere at exactly 4:51 p.m.