How cold does it have to be outside for you to consider it cold enough to wear a jacket? Essentially, what temperature do you consider cold? Oh, and vice-versa, what do you consider hot?

I don't usually wear a jacket at all. I will wear a sweatshirt sometimes if it gets below 55 though. But usually I prefer to enjoy it. It isn't really cold unless it is in the 40's. At least not for me.

As for heat, I find that the high 60's and low 70's are perfect. Above that, and is too hot. I don't like the heat, except for the fact that it means I get to go swimming. I like swimming.