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Need to correct your information on how well these breeds lay. Buff Orpingtons lay around 160-180 eggs per year. White Leghorns will lay close to three hundred eggs per year if from production strains.
It can, briefly, get over a hundred degrees here in the summer (thankfully it always cools off at night, though), and I've made a couple of observations. One year I had some Cuckoo Marans and several other breeds (Easter Eggers, White Leghorns, and something else, don't remember what). The chickens were in chicken tractors (cages on the ground, with no floors in them) covered by a tarp for shade. Tarp blew off when I wasn't home (it was weighted down, but we get some terrific winds here), and I ended up losing two of the Cuckoo Marans to heat stroke, but none of the other birds. Fast forward to last year -- I had some young Salmon Faverolles in chicken tractors with a bunch of other chicks (Buff and Golden-laced Wyandottes, Buckeyes, Mille Fleur Leghorns). Again lost the tarp on a hot day and lost birds -- the only birds I lost were the Salmon Faverolles. What the Marans and the Faverolles have in common is that both are heavy breeds, leaning more to meat than eggs (both were originally raised for meat at least as much as for eggs), and both are Continental breeds. Both are also fluffy-feathered. In a really hot climate, I would stick to breeds listed at heat-tolerant on the Henderson breeds chart that someone else already posted a link to. My first choices would be Mediterranean breeds such as the Leghorns.
Kathleen