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That's what I found in coastal South Carolina. Looking at what happens to my stuff in my shop, there's NO WAY I would ever take out anymore than I intended on using.If you are storing ammo in a hot, humid environment then yes, you are ruining it.
Lead will frost, powder will degrade and brass will tarnish.
I live in Houston, similar climate, and all ammo, powder and primers are inside. I would never store any of it in my garage. I've seen what happens to tools, plastics, chemicals etc after 5-10 years.