September marks the beginning of fall in both major systems. Early September often still feels like summer, with warm days and lingering summer activities. But by late September—especially after the equinox—true autumn signs emerge:
Late September, October, November, and most of December.
Most traditional calendars and almanacs rely on the definition. This method defines seasons by Earth's position relative to the sun, specifically using the two equinoxes (spring/fall) and the two solstices (summer/winter). what months are the fall
Green leaves begin losing their chlorophyll, hinting at the bright colors to come. October: Peak Autumn The Vibe: Crisp air, cozy sweaters, and spooky themes.
The transition from summer's warmth to winter's chill is defined by autumn. However, the exact months that make up the fall season depend entirely on your location and the system of measurement you use. Astronomical vs. Meteorological Fall September marks the beginning of fall in both major systems
National Centers for Environmental Information (NCEI) (.gov) When does autumn start? - Nature's Calendar
For the astronomer tracking the precise movement of the sun, fall begins on the autumnal equinox in late September and ends on the winter solstice in late December. Most traditional calendars and almanacs rely on the
What Months Are the Fall? A Complete Guide to Autumn's Timing