I can't speak for all products in all climates.
But.
I just used a one gallon jug of Meguiar's #82 that I forgot I had and found when I was installing new storage cabinets in my garage. It had been in there for at least six years, probably a lot longer. In the summer the garage gets up to 130 degrees, and in the winter it might get down to 38 degrees. The #82 still smells, looks, and works just like the new quart bottle I have.
When it comes to wax I have many cans of Harly Wax, a pure carnauba, that is twenty years old and works just the same as it always did.
Can't tell you anything about all these "newfangled" synthetic products. Hide some in your garage and try them in a few years and let us know:xyxthumbs: