I now live in northern (mainland) Europe (just left England) in temperatures of as low as -25 C in the winter. I have a jacket that can make you sweat in -10, a

I now live in northern (mainland) Europe (just left England) in temperatures of as low as -25 C in the winter. I have a jacket that can make you sweat in -10, and I now go running at 0 C with shorts&tshirt (temperatures 5 C and above make me sweat after the first 5 minutes). My latest long distance run was in Italy and I ended up walking half the race because of the heat (+10).