I have, depending on where you are from, a "root cellar" or "fruit cellar". It's the little storage room in your basement right underneath the front porch. I had steel security door installed with multiple locks. Although my gun safe is in there, essentially the entire room is a gun safe. I keep all my gun related stuff in there (except home defense handguns of course).
Now, the basement is cooler than the rest of the house in the winter, but obviously not as cold as outside. In the summer it is warmer than the rest of the house but again less so than outside. I have a dehumidifier running in the laundry room/gun workbench area just outside the fruit cellar/safe. In the summer the fruit cellar will get a little bit more humid than the rest of the basement because I leave the security door closed all week while I'm working and usually just open things on the weekends when I'm off and screwing around in there. In the winter it stays cooler than the rest of the basement for the same reason but the air is dry as a popcorn fart.
I know ammo is supposed to be stored in a relatively temperature controlled environment. My SHTF stuff is all in ammo cans. While in the winter the fruit cellar gets chilly it isn't "cold" per se (as compared to outside). In the summer it gets a little stuffy in there but not like outside. While I don't have a thermometer I'll wager a guesstimate that temps in the gunroom fluctuate yearly between the upper 40's to the low 80's with reasonably reduced humidity during the summer (considering the security door is closed during the week as I mentioned above).
Is that a sufficiently "controlled" environment to store ammo in long-term?
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