First, you should always wear whatever scents make you feel happiest! The idea of different scents for the seasons is not a hard and fast rule. Some of us, though, do gravitate to our heavier scents in cold weather and lighter ones for summer. Some even choose completely different fragrance families when the weather changes.
A lot depends also on the climate where you live, of course. My summers are hot and humid, so I have lots of perfumes that I do not touch during that time. When the first hint of fall hits the air, I eagerly pull out all of my old faves that I have been missing for months.
You may want to save your very heaviest, dramatic scents for real winter weather, but autumn scents usually include notes of leather, smoke, tobacco, spice, resin, vanilla, amber, or even earth. These happen to be my favorites, so autumn is my happiest perfume time.
On the other hand, lots of people have a signature scent or type of scent that they wear all year, as you do, carollu. I suspect that you are just not as fickle as I am, or that you know what suits you best.