In the Northern Hemisphere, summer typically falls in the following months:
The most widely accepted definition in North American culture follows the astronomical calendar. Under this system, summer is dictated by the tilt of the Earth's axis and its orbit around the sun. Astronomical summer begins on the summer solstice, typically falling on June 20th or 21st in the Northern Hemisphere, and concludes on the autumnal equinox around September 22nd or 23rd. Consequently, astronomical summer primarily occupies the latter half of June, the entirety of July and August, and the first few weeks of September. While this is the definition most people recognize, it often conflicts with actual weather patterns.
In conclusion, the months of summer cannot be pinned down to a single, universal definition. They shift between the rigid lines of the meteorological calendar (June through August), the celestial movements of the astronomical calendar (mid-June through mid-September), and the geographical context of the hemisphere. Ultimately, summer is as much a feeling as it is a time period. Whether it is defined by the solstice, the thermometer, or the last day of school, summer remains the season of warmth, light, and vitality, however one chooses to mark its boundaries.
Ask a group of people when summer begins, and you are likely to receive different answers. A meteorologist will point to a specific date on the Gregorian calendar, while an astronomer will look toward the solstice. A schoolchild, however, will simply mark the day the final bell rings. The question of "which months are summer" seems simple on the surface, yet the answer varies significantly depending on whether one defines the season by the stars, the atmosphere, or societal rhythms.
Whether you follow the stars or the thermometer, summer remains the season of growth, warmth, and outdoor adventure.