One, the light is changing with the angle of the sun. Even when it’s warm and sunny, it looks different. And the nights cool off considerably more. We’re down to thirteen hours of daylight (from sixteen on the summer solstice), and losing several minutes a day.
The other is a bit more cheerful.
This little clump of hardy cyclamen thrives in the dry shade by my front door, puts out pretty leaves every winter, dies back in the summer, then, once I’ve forgotten about it, does this every September.