Cold/Hot storage of computers -- OK?

Hello all, Since I am rapidly exhausting all space in my basement workshop, I need to move some of my computers to the loft above our garage. The problem is, the garage is completely UNinsulated, and has only a metal roof (i.e., thin, and NO resistance to temperature -- hot or cold). My concern is that the cold of winter or the heat of summer might get to them. I live in Massachusetts, so winter is not -40 degrees F, but we are talking below freezing, and possibly below zero for short stretches. In the summer, it must easily hit 100 degrees F in the loft, due to the hot metal roof, and the trapped air (no windows!). I'm not so worried about the circuit boards, but I am worried about floppy drives, hard drives, and CRTs. Does anyone know if such temperatures will kill these things? Obviously I would let the computer acclimate for about 24 hours after I move it back into my house, to avoid sudden temperature swings, or condensation. I'm more worried about the storage affecting them.... Thanks! Rich B.