I like this idea. As a not-so-avid-yet-still-reads-the-book reader of Sun Tzu\'s Art of War , the chances of victory are determined by knowing yourself, knowing the enemy, knowing the terrain, and knowing the weather. Of course, it was mainly for commanding armies, but lets just apply similar rules here. Maybe not rules, but if you catch my drift then you\'ll probably know what I mean.
Perhaps the weather can also affect monsters \'inderctly,\' as in not in whether they live in sunlight, but things that aid their speical attacks, things that harm you, things that demoralize people, and so on. Speical attacks would be casting spells, spitting, roaring, and so on. Thw wind would affect those things. For example, a roar that sends enemies fleeing. If the wind is directed at the enemy, then they\'ll probably flee. If it is directed against the raorer, then the creatures on the roaring creatures side would flee. Or there could be creatures that \'ride\' on the wind.