The part of the online map that I could see matches the book very well. Parts of mountainous northern California, the Puget Sound Area, and other mountain/sea areas (British Columbia) are brutally "simplified" in the online version, and people wonder why they can't get X to succeed, when it's supposed to grow in Sunset climate zone so-and-so....
As to getting mangoes to succeed, I know there's at least one thread, maybe two, around here on germinating mango seeds, but if you really want fruit in your own lifetime, go around to local independent nurseries and ask them where *they* would purchase a fruiting mango tree of the varieties you're interested in. The only place I've seen the Indian-style mangoes for sale in the Bay Area are the Ranch 99 Markets; pretty funny, since they came into being to serve Chinese/Thai/Vietnamese customers rather than those from India. But now, Ranch 99 is almost mainstream up here; if there are any Ranch 99 or similar markets in SoCal, see if the mangoes are imported or locally grown. That might give you a lead as well.
Also farmers' markets....
I fell in love with mangoes when I was a kid in Panama. The trees were so numerous and so productive that I could ride my bike around base and off-base in the Canal Zone, stand on the pedals, and just pick the mangoes, filling my bike basket. It turned out that I was the *only* member of the family who liked them. This was pretty special, since I was the oldest of four kids at the time (five, later) and both my parents were with us, too. Having all those mangoes to myself, picking them, selecting them for ME...it's hard to describe.
But beware the warning in Sunset. As much as I love mangoes, I have to wash my hands and arms *immediately* after peeling them, or else I break out in a terribly itchy rash. My next sister won't eat mangoes for fear that she'll break out "inside"--but she never even tried them. Wimp. My second sister *does* break out on her mouth if she eats them. She did try.

Don't know about my brother.
My parents just hated anything "weird."
Watch out, then, in case you or someone in the house is subject to the rash caused by the oils/juice on the skin.
Cynthia