Because apparently it wasn't already before, it's now officially cold outside.
Nothing magical actually happens at -100. It's cold, but it's not like you start glowing when you step outside. What the really cold temperatures do mean is clear skies. So while some folks on station were warming up the sauna for the 300 club (sit in the sauna at 200, then run to the pole and back naked at -100) I went outside and took pictures of auroras.
Speaking of which, if you do like my aurora pictures I have a gallery here. Of all the things I do on the internet, this is the most often updated.