It gets over 100 in my area. My orphingtons do okay, but they look miserable when it gets over about 105. Good egg producers and really friendly, easy to keep. My Welsummers do good, but I find them noisy and flighty. I keep mostly Barred Holland's, they tolerate heat well and are the friendliest most curious ones. A little slower to develop and not the top egg producer, but a really sweet breed.
And everyone needs an EE or two, cause who doesn't want blue/green eggs? But they too can be a little aloof.