The fall season you're familiar with begins with the autumnal equinox in mid-to-late September and ends with the winter solstice a few days before Christmas. That's known as "astronomical fall."
According to weather types though, there's a different fall, one they call "meteorological fall."
It starts Thursday and only lasts until the end of November. Theoretically.
Hereabouts, it doesn't start usually until mid-to-late October. And in some years it never quite ends until spring -- though with a few winter-like mornings here and there. Sure the leaves are all down by Christmas or so, but the weather...?
Another reason I'm so looking forward to eventually moving out west. There'll always be four seasons, and they'll start and end more or less on time.