Along the Gulf Coast, the changing of the seasons can be hard to see sometimes. There is no massive changing of the leaves in color like in northern states, just a bit of chilly, rainy weather. You have to check for Christmas decorations sometimes to know that winter is really coming.
But there are a few things you can look to for verification that fall is indeed upon you and cold weather might actually make it south enough for you to turn the heat on. The geese flying south can sometimes be heard way up high and the fields that haven’t been cleared for home construction are cut and baled.