Heh, I have the opposite problem. If I leave my gadgets in the car in the winter they stop working until I can thaw them out. I used to put energizer photo lithium batteries in my mini-mag so I could work outside and still have light. Even then it would dim on really cold days. I think in the summer it gets around 100 inside the car if I don't open the doors all day, well for 8 or 9 hours any way. It's to the point that it doesn't really get dark now.