I remember my mom telling us to look at each other faces so we can watch for frost bites on our cheeks. I was later told the thermometer indicated -53 F. It was near James Bay. up north...way up.
There is a Skydiving club or clan in Quebec that calls itself the "Flying Polar Bears Order". You want ton be a member? All you have to do is jump out of an a/c when the temp on the ground is -15C and have a witness (alive) than can testify... now