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It is true, tyres in hot climates perish quicker than cold climates. It's happening to the ones on the car too... And sitting on concrete is bad too. The air is what detonates the rubber. Sun doesn't help either
But including the spare in the rotation will allow you to use it and extend your tyre wear life by as much as 1/5 more if it doesn't perish first.
Beware the trapped moisture isn't going to cause other troubles.