Rain is an essential part of the water cycle. Rain gives water to the plants. Some of the animals then eat the plants. Some other animals eat the animals that ate the plants and so forth and so on. We eventually enter into the food web: we eat the animals that eat the animals that eat the plants... You get the idea. The plants also give us oxygen so that we can breathe. And we too eat the plants.
Rain also makes me drowsy. The darker skies and pitter-patter sounds on my windows lulls me to sleep. It's very relaxing and soothing isn't it? I think humidity and barometric pressure also plays some part. Less oxygen in the air brings about that feeling of drowsiness.
So that's your science lesson for the day. Rain also washes dirt away from my car and clears the roads of the snow. Not many piles of snow remain right now. I think Spring may finally be on its way. But of course too much of a good thing can be a bad thing. Right now we are seeing some flooding because of too much water. Hopefully we'll see the sun soon.