I think nic juice. Not pre-made juice.
So then mixed/pre-flavored juice should not be stored this way?
I was just reading that link you posted and Kurt mentioned that.
"This long term storage is for unflavored, and undiluted nic-juice only. I do not store flavored DIYs this way. I make them in relatively small quantities and vape them up before making more. Flavors are probably the most unstable part of e-juice, and the presence of water in them will hasten their decomposition into nasty tasting products."
I keep mine on my desk, away from sunlight. A friend of mine has had some juices he had stored in a tackle box in his room when he quit using his. He recently got back into it, took them out (been about a year) and is using them again without any issues.
Based on the type of chemicals they are, I would expect it is best to keep them somewhere dry, and away from sunlight. Extreme conditions in one direction or another could mess with the different flavorings.