The problem with exposing any implememt to the elements is the pooling of water and resulting rust. If you need to store your mower outdoors, find a way to store it vertically to keep the water from standing around the bearing houising and make sure you lube twice what you might if the unit were stored in a shelter. If its your loader that must endure the weather, common sense will prevail...
If you choose to require your spouse or her mechanisms to endure the weather, you are wise enough to know that you must endure your own resulting climate(s).