There are parts of San Francisco that can be 10b..not going below 40 most years..the exceptions are not never though, or rare,as they can happen to have a real freeze every 10-20 years.
Even 10a's are regular for most of inner SF bay..but,10a's 32F limit is a much more limiting on the west coast and 37 north then any Florida 10a.
But 11 in California is not possible..ocean water temperature alone will create a nontropical winter. Or visit what some claim as z11 and swim in a unheated pool ,Dec-April!
It might be a nice exercise to argue for a z11 California for some...
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