You can wear whatever you like whenever.
But typically certain notes and fragrances remind us of certain seasons.
Winter: Burberry London
Since in SoCal things never get that cold, you might think you don't need or want a winter frag. Well, that works if you are wearing frags based on what the weather is like (since frags certainly do wear differently in different temps/ humidity,) or you can wear a frag because you want to impart a feeling from it.
You might want to wear a "winter" frag in the hottest part of July because you want feel comfy and smell sweet that day.