Here is an extreme case of expired film sustained an extreme bad storage condition.
A few years ago I had one roll of Fuji slide film, by accident, lost in my garden for about one year. It was summer, then fall, then winter, then spring, and I finally discovered it one day in the spring grass. It is a small object so grass may well covered the film. The plastic wrapper shielded it from water damage. I open the plastic wrap and found the film is still dry. I shoot the film as usual. After development I found it has some color shift otherwise all images are still quite good.
Since then I never ever believe that all films strictly requires freeze, or refrigerated, or cold stored, etc. I believe proper room temperature is sufficient for most of modern films even after years of expiration.