I'd get a well sealed container such as the water proof ones that are made to carry cameras, etc., in, which walmart sells and just pop it into the refrigerator when you leave. along with an adsorbant for moisture/humidity. the temperature limits on the package are those at which the manufacturer has done stability studies on the product, not necessarily at which if one degree over or under the product will disintegrate before your eyes, and probably match with some of the USP definitions. I suppose there is some exception to the rule out there but virtually all of the stability studies I have seen show heat to be the issue, colder temperatures provide more stability for the product. Not talking about freezing stuff however.
bumpy