What's that sound?

I was woken up this morning to a strange sound. It sounded a bit like someone was rustling the leaves in the tree outside my window. Who would be in my tree at this time of the morning? The boys are at camp (and wouldn't be out of bed anyway). Wait, there is a strange smell as well (as opposed to the smell of smoke that we have been smelling for weeks now).

Now there is another sound to go with the leave rustling. It sounds like something splatting on the ground. Over and over and over. Wait! I think I remember that sound that goes with that smell. I better look outside to make sure I am right.

I am right. Rain! It is raining!