I wouldn't be surprised by this at all due to the fact weather patterns can contribute to mood changes and certain biological issues such as bodily stiffness and fatigue (such as cold rainy weather).
_________________
Balance is needed within the universe, can be demonstrated in most/all concepts/things. Black/White, Good/Evil, etc.
All dependent upon your own perspective in your own form of existence, so trust your own gut and live the way YOU want/need to.