It's fall. That can't be denied anymore when you look outside. When your feet get cold just sitting around the house. When you have to put on a sweatshirt to spend any length of time outside. When the light changes. When you get that little bit of fear in the pit of your stomach, that the warm weather is gone, and who knows if it's ever coming back?
There's a smell of chill in the air, and you can foresee the real cold coming, fall can just be the forerunner of winter. The leaves will fall, the temperature will fall, and April's a long way off.