I always thought a fridge was low humidity? Have to look it up.
The way it was explained to me once, as a general rule - heat and light act to degrade stuff, but oxygen was necessary for the process and the more the merrier. In other words, keeping it in a cool, dry place with the top off would be worse than a warm, moist place with the top on (this is just an example to attempt to make myself clear.)
What I'm getting at is keep your bottles closed until use.