You can get a better climate zone on line
https://www.google.com/webhp?s...
It will explain the differences. You will find that Ca.is a very diverse state, climate wise. We have micro climates within micro climates, depending on how far you are from the coast, what side of the hill you live on, etc. I live in the LA basin, in USDA zone 10, but My zone 10 is a far different climate than Florida's zone 10, and what we can grow ( and when) is also very different.