Edit: eh... on second thought, this needs more work. i'll get back to it... eventually.
==X==
Just as the title says, I thought of a set of effects that would apply on certain floors. This suggestion tries to give a little more meaning to status resistances.
General notes:
1- A knight with resistance to the status that the weather condition represents won't be effected by it, however, if a knight has no resistance or has vulnerability, then the weather condition's effect applies.