DVDs and CDs seem to generally be rated reliable for storage from -10 to +60 degrees Celsius (-40 to +150 F). When environment testing our data storage facility we were able to successfully read/write to stored DVD/CDs without error up to +92C (but they began to smell really bad by +80C) the plastic was too brittle below -30C and fractured easily (especially with cheaper band names). A side note; the cases do not survive nearly as well as the platters and would melt or fuse themselves to the disk making them unreadable much sooner. Warping didn't seem to be much of a factor even with the softened plastic. Sunlight (UV) exposure will damage the disks also (they eventually grow a powdery film on the exposed surface and begin to look cloudy). Basically, they should be able to withstand any normal room temperatures, however; the rising heat path of a baseboard heater carries allot of dust and static charge with it (also causes rapidly fluctuating humidity %ages) which also can damage your disks over time. If it's avoidable it would not be my location of choice but either way your home-owner's insurance policy may have a ryder available to cover loss due to "environmental conditioning" damage.
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