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I also want to know this! I'm in Vic but we still get 35 degree celcius summers. I know my faverolle looks a bit too hot sometimes and cochins look like they have even more feathers than her!
I don't know your humidity levels there but I lost several one day this summer. It was 98 degrees Fahrenheit with high humidity which raised the heat index to well over 110. Other Cochin breeders also lost birds in the heat this summer. More large fowl losses than bantams if my recollections are accurate.
I am in San Antonio, TX and this summer the temps got to 107-110 consistently on a daily basis. None of my cochins died, but a barred rock did. Around noon I would go out and wet a section in their coop everyday, so they would have damp mud, and lightly sprayed the birds. I dont know if I was lucky, or it helped or if they would have been fine reguardless!!