From what I have experienced so far, the SoCal cold has not been an issue for any mango variety.
Cuban007, very interesting, If you're right, and South California has mangos year round, then I don't see why we can't have mangos year round in South Florida.
I'd like to find out more about this, because with all the biotechnology we have today, I'm close to 100% certain that this is not impossible.
If the U. Florida can modify peaches so that they can grow in South Florida...
If scientists can transfer a glowing gene from a fish to a kitten...
Then, having mangos 24/7 (including winter) is far from impossible.
May the search/endeavor begin.