Some of the members on the 2022 Vegetable Garden forum who live out west and southwest are always talking about the heat and their plants...a whole other set of challenges from what we deal with in the NE.
For us, July and August are our hottest/most humid months, but with abundant water it is easy to overcome the heat aspect. Mildew and fungi are our main culprits in those two humid months. We also don't have the wild temperature variations like you have. Of course, you don't have to deal with what seems like the endless cold winters and snow like we have here in the Pocono Mountains.
Trade offs no matter where one gardens in the USA. I think I'll stay put here in the NE.