I would say anything below -25 (including wind chill). It's been a rough week.
I was never a fan of hot weather until last summer. Now I can stand it up to 30. So I guess I have a 50-60 degree range that I am happy with.
DH was in Texas this week and by the time he got back yesterday, he'd already gotten used to the southern weather. He had been complaining that the temp got down to 0 one morning. It was a huge shock to his system when he landed back in reality last night.