Lori ...
Cindi lives in a climate similar to yours, so her recommendations have been tested for your conditions.
I do have high summer temps for months on end and of her recommendations, I grow 'Linda Campbell'. It is half rugosa and half miniature. It handles my high temps quite well and has been reported to be cold hardy in zones colder than yours. I think it is going to end up being a big plant in my garden. I don't know if it is as large in Cindi's.
The big concern about 'Oklahoma' is that dark colors absorb heat and the blooms can crisp and not open well. It also is said to have a slow repeat. But when 'Oklahoma' gets it right, it is a rose to die for. When I moved to the mountains, I didn't bring my plant of 'Oklahoma' with me, so I can't confirm whether or not the blooms fry, but I do know it is a rose that likes heat.
Smiles,
Lyn
