Right now rain is hitting my window and as it comes down it gets split up by the fly screen then hits the wind in tiny droplets, also the rain only hits the window when the wind blows it. All these things are causing it to sound like cracking and I was freaking out thinking the walls wore cracking and I was looking everywhere for the crack. Also BTW it's really cold and that means REALLY cold rain, there's tiny amounts of frost on the edges of my windows :D.