@Carolyn22 .......
Depends on the rose ....
Some classes of roses actually go dormant in high temps. Of course, you don't find much about that in rose literature and rarely in the marketing info about roses. They've been marketed as being able to be vigorous plants in all climates, but actually are regional in their performance.
I know plants respond differently to humid heat vs dry heat, so I am back to doing lineage trees. If I can find plants that include the species that are native here in their lineage, my bet is that I will have a greater chance of success.
I need to find plants that will work in the shadier areas of the garden.
Gardening in the mountains is all about micro-climates and elevation.
Thank you all for sharing your experience.
Smiles,
Lyn