On Thu, 27 May 2010 16:41:16 +0000 (UTC),
(Andrew Gabriel) waxed lyrical about:

Is it safe to store audio CDs in a loft which regularly hits 45C
in the summer, or is that going to cause them to deteriorate?
These are standard mass produced ones, not home written in a
CD writer.

As I understand it, CDs at 45C shouldn't be a problem - the issue
comes with rapid changes in temperature which, I would think, are
likely in a loft during the summer.

If you can store them in a crate lined with some form of insulation
(old Celotex offcuts, perhaps?) you should be able to slow the rate of
change by a considerable amount

Perry