I've heard people talk bad about those having Orpingtons in a hot climate because they assume the Orpingtons suffer more than other breeds in the heat. But I have to say, they don't suffer any more than my Dark Cornish or my Polish. So I don't think the close feathering helps at all in withstanding any sort of weather. For that matter my Black Orpingtons appear not to suffer as much as the Dark Cornish do. And to confuse things even more, Crevecor (spelling) are reputed to withstand heat better than polish, yet both breeds are physically very similar. Australorps, which are often confused with Black Orpingtons since both look so very much alike, are more heat tolerant than Orpingtons, or so I've been told. Which leads me to the conclusion that unlike cold tolerance (where rose combs have the clear advantage, etc.), heat tolerance is a breed trait unrelated to physical appearance such as tight/loose feathering, etc.
This is admittedly all observed data and not the result of any official studies, so if anyone has conflicting information or observations, let me know.
This is admittedly all observed data and not the result of any official studies, so if anyone has conflicting information or observations, let me know.