Condensation is not good for disks.
Had someone who wanted to restart writing his book. He had stopped working on it several years before and left the Mac and a few floppies with backups in the garage. His kid had long ago reformatted the Mac hard drive to use on his computer. So the floppies were all that was left.
This being Iowa the temperature and humidity vary all over. I couldn't read the floppies reliably at first. This after I put a floppy drive in a Linux PC with the correct Linux drivers/software to read Mac formatted disks. Slid the cover over and saw that all the disks had spots of mildew on them. Spent a hour or so washing them all through the little slot with a bunch of Q-tips. Then I could read them pretty good.