Modern tyres are very robust. I just keep mine in the (unheated) garage and have not noticed any adverse effects. I can't imagine (unless we're talking more than a couple of years storage, and/or lots of changes in/extremes of temperature) it really makes much difference.
Think what most tyre shops are like; typically large open fronted buildings, tyres often in sunlight at some point during the day/in the cold in winter.
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