The two exceptions I know of are time, in which passage of cosmic rays accumulate and fog the film, while proximity to radon gas decay and high elevation are gamma ray killers and will similarly fog film, but often much faster. I’ve shot 15-year-expired Kodachrome that came from Wisconsin and saw loss in Dmax (the blacks) due to said fogging. For gamma rays, they say lead-lined boxes help slow that, but cosmic rays are unstoppable and pass through everyone and everything, including planets as if solid objects don’t even exist.

The other exception are particularly unstable emulsions like Ektachrome EIR (the colour infrared film here) and HIE (the b/w infrared film Kodak also stopped making). They’re the only films I know of where the indicator icon for proper temperature storage say “-18°C/0°F or lower”, so the fridge alone is out. I keep mine in back of the freezer, but even that is no assurance for the cosmic/gamma ray wear and tear. Fortunately, radon incidence is low in most of the places I’ve lived over the last several years, Minneapolis being the sole exception. Also unclear is how bad things are in Montréal. Apparently it’s higher there due to its proximity to Appalachia, a known haven for radon decay.

So yeah, this is tl;dr. Bleh.