Nina, I also have IV and live in Dallas. I love the summers in Texas, except for the extreme heat. My skin does clear up in the summer and I have experimented with a tanning bed in the colder months also. It seems to help, just don't overdo it.
My wife and I cruise a lot and love the Caribbean and have talked about retiring there. We did think about Red River, NM once, but I think my skin would rebel pretty quickly.
What part of SoCal were you referring to? Depends on location as far as heat, humidity, etc. Some altitudes might not be as beneficial either.
51 / Icthy Vulgaris / Son and Daughter not affected