Thanks for the link, I have to confess I've never thought to search for info on this topic. After doing so, I did find multiple articles from tire websites saying to store tires in a climate controlled area. Really?! I'm not going to lug all my tires down to the basement and back every six months.
Am I the only one who thinks these tips border on the extreme? Vacuuming air out of the bag? Ozone from a "nearby" motor (how close is that?) IMHO people are overthinking this. Every year for the past couple of decades I've stored multiple sets of summer tires in an unheated garage with no ill effects that I have ever noticed. In fact, my local tire shop keeps their whole tire inventory in a non-temperature controlled space above their garage bays.
If they were museum pieces I would understand, but these things do have a tendency to wear out when used.
It's actually during the warmer months that I notice a degradation, where the tread seems to disappear, presumably from friction against a rough surface

In all seriousness, I wouldn't leave them out in the snow, or under a set of UV lamps, or in a room full of toxic vapors that I wouldn't breathe. But you'd have to show me scientific data to prove that storing them in my barn or garage is going to degrade or shorten their life in any meaningful way before I wear them out anyway in a few seasons.