Wanna know what it's like when hell freezes over? Come spend a winter here in northern Wisconsin. It can be brutal, we get down to 30-40 below zero, with wind chills sometimes over 60 below. Snow, ice, wind, rain, freezing rain, hail, and everything else mother nature can throw in to make life suck. In winter our temps can drop 60+ degrees in a matter of hours. In summers it's the opposite, we just about hit 100 degrees here a couple times in the last week, and summer has just begun. We use a lot of aluminum and ACM, and they hold up just fine in our unpredictable climate.
We've been doing signage and kiosks for a river-way trail/ kayak project for years now, and many of them sit out in the open along rivers with no protection, the worst of the worst for conditions. We've been using 6mm ACM and haven't had a failure yet. We also do a lot of wayfinding and other signage for businesses with ACM panels, some over a decade out in our wonderful winters, and doing just fine. Gotta remember, besides
signs they use ACM to clad building facades, panel trailers with, in all different climates, all over the world. It's durable stuff (if you stay away from the really cheap crap). Just avoid using thin stuff when doing larger exterior
signs, the thinner you go, the more it'll try to warp/ expand/ contract in extremes. The 6mm hasn't failed us yet.
