Canadians should not get cold in Austrlia but...
Pierre, one of my friends flew over to Canada for his wedding (to a Canadian girl) arriving just before the big day. After wedding service, they had all the photos out in the snow. He got hypothermia and spent his wedding night in hospital without even making the reception. Can't be too bad though as he and his wife have moved back to Canada to settle down.
But seriously up where you guys went hiking is probably one of the coldest spots in Queensland. I know snow has been reported up there. Was this a second trip or a late posting of the pics?
Just wait till winter comes. Mate, that's the best time to get out and see this country. No mozzies and other bitey insects, snakes, energy sapping tropical heat, cyclones and torrential rain, muddy waters, marine stingers, etc, etc.