Rain and snow are going to play a huge part in your yard landscaping decisions. For example you will have to plan for your yard landscaping with care. You should go to the library and take out some books on the subject. These yard landscaping books will help you to learn all of the most important points of yard landscaping so that you do not ruin your yard for good.
Your yard landscaping needs to be done with close attention being paid to rain and snow as well as proper drainage. If you find that your yard gets too muddy in the winter or you have large puddles all over then you most likely do not have the right kind of drainage going on. This is something that you may want to consider getting a professional in to take care of. If you still want to do the rest of your yard landscaping yourself then this is fine but some things are better left to the professionals.
You need to have your yard landscaping done in such a way that the rain when it falls, will actually water your plants. You will be able to use all of the water that falls into your yard to feed the plants and the trees if you set up your yard landscaping the right way. Knowing the general rainfall...