Growing up in da Yoop I think I saw -35F a few times, the lakes generally protected us from the colder stuff. Usually on a calm, clear night. But -15 and walking into a stiff headwind is way worse, had to do that a lot heading to class. Playing broomball with a helmet once in -10 or so my ears froze, luckily not to the point of frostbite. Since I moved to the DC area I don't think I've seen it quite drop below 0, but the way the news goes on about the "Arctic Blast" whenever the wind chill drops into the teens or single digits is just precious.