The author explains that some others always use “it was a stormy nights” but doesn’t really know that it can symbolize other things. It can mean other things like for example if a character wanted to be cleansed. Symbolically he could walk through the rain to get somewhere. He could be transformed by the time he gets there. He might be less angry or less confused. The stain was on him could be removed. However the author explains that it could be a bad thing because if he falls down in the rainy mud he could be more stained than before. So the problem with rain is that you have to watch what you wish for or what you want to be cleansed.