Summer - pretty hot, especially in the Valley
Fall - perfect during the day, cool enough at night for jackets!
Winter - perfect during the day, but you might need a sweatshirt. Don't forget the jackets for early mornings and evenings!
Spring - warm during the day, sometimes VERY warm, still perfect at night.
Most repeated word above: Perfect. And, yes, trees in Southern California actually do change color in the fall...aren't these colors magnificent??

Right in our very own neighborhood!
Happy Fall Y'all!