Hello,
Another thing i would like to add is that the extreme heat could warp the discs so that they cant be used anymore. Not to mention the conditions up there might be to damp in the winter and to dry in the summer. So you would need a humidifier and a dehumidifer to keep the moisture level at a resonable rate during those times of year.
It jsut wouldnt be a good idea to store them in such conditions. If you have a basement or some other place you could store them it would be much more practical.
Cheers,
Mak