Welcome to BYC! I raised Buff Orpingtons and Black Australorps in the northern Sacramento Valley where summer temperatures frequently reached 117-118 F (123 F once). I made sure to provide shade and plenty of fresh water for my flock. I like the Orpingtons because of their beautiful color and sweet, gentle disposition and still keep a few in my flock. They managed to survive, but did seem to suffer in the heat, unlike the Australorps, who seemed almost unfazed by it. Unless you have your heart set on Buff Orpingtons, I would recommend the Black Australorps instead. They have the same sweet, gentle temperament of the Orpingtons (not surprising since they were originally bred in Australia from Orpington stock), but they are more heat resistant (consider the temperatures in the Australian outback where many of them are raised), and they outlayed the Buff Orpingtons by a considerable margin (the Orpingtons averaged about 3 eggs per week per hen, the Australorps about 5 eggs per week per hen). Hope this helps.