Eh, while 122F would probably be a rare temperature in most areas, judged by weather reporting, I think if you consider hyper-local effects it might not be too rare. If a dish were positioned over or near tarmac, it would experience weather several degrees hotter than the weather channel was reporting for that area. You'd also want to avoid placing it near the radiators of air conditioning systems, and other things like that.

Just something to keep in mind during installation I suppose, not insurmountable problems by any means.