Rain deduction

I don't know if the following is impressive but I thought so yesterday. We were indoors and I think I was feeding her. My back was facing the window and she was facing the window. She said rain. I could not hear the rain but I could just about make out (through the net curtain) that rain water was landing on the window pane. So she realised the water droplets on the window pane mean that it is raining outside.