Here's an interesting theory: very cold weather may cause low blood sugars.
I have nothing scientific to back this up... just conversations with two local Type 1's, both of whom, like Rosie, experienced a lot of unexplained lows last week during Ohio's bitter cold weather.
It kind of makes sense to me. After all, if Rosie is sky-high, we put her in a warm bath, and that helps bring her down. So I suppose that it's not too far-fetched to think that cold might have the opposite affect.
I haven't researched this yet, I'm just thinking out loud. Does anyone else experience a difference when there's a drastic change in temperature?