Black and white can be tough to convey what we want to say. However, art is art whether subjective or not. I honestly cannot tell you are talking about rain just by looking at the drawing maybe because it is in black and white or because I am no artist lol! Reading your description of it helped me realize and appreciate the drawing better.
I enjoy the sound of rain and the smell of the earth. Rain open up your senses and it can bring you sadness or gratefulness. More often I find it relaxing because of the hypnotic sound it brings. We need rain to appreciate the importance of the sun and heat. Rain comes to nourish the earth and refreshes the earth.