well, despite popular belief, we have a summer with lots of plants, trees, grass... i mean it gets as warm as 90 here. it's just that we have a slightly longer, harsher winter than the rest of the US. my chickens are just fine
we have outdoor birds with no problems at all, we've just got to be a little more prepared when it comes to our harsher winters. we manage just as well and the folks in the states do