meh, you don't really have to start wearing a coat until its about 20 or so.... I feel sorry for the people from the south that already have the parka's on....
You can usualy play hockey out on the ice in the parks with a T-shirt on until its about 15-20 degree's also. feels great.
0 or -5 is about where I throw on a coat finally. otherwise it just gets to bulky for going outside.