Perhaps the most pervasive definition of summer’s end in America is sociological rather than scientific. For the majority of the American workforce and student population, summer effectively ends on the first Monday of September: Labor Day.
Summer in America typically ends around the fall equinox, which falls on September 22nd or September 23rd. However, the exact date can vary slightly from year to year.
In the United States, the answer depends on whether you’re following the astronomical calendar or the meteorological calendar.
Keep in mind that this date can vary slightly depending on the specific location and climate. Some regions may experience a longer or shorter summer season due to their geographical location.
The equinox marks the moment when the sun is directly above the equator, resulting in nearly equal hours of daylight and darkness across the globe. Following this point, the Northern Hemisphere tilts further away from the sun, days grow shorter, and the solar definition of autumn begins. For purists, this is the only legitimate answer: summer lasts until the very last second of the final day before the equinox. However, this definition often feels disconnected from the lived reality of late August and early September, when the days have already begun to cool.
In the United States, summer is generally considered to end on the first day of fall, which is marked by the autumnal equinox. This date usually falls on: