Play misty for me

Misty rain all the way home this morning, low clouds hanging in the mountain valleys. A foggy mist drifted over the river masking the water surface. Most of the regular critters were hiding in the brush staying as dry as they could. The solitary man was out, hiking up a hill, his head protected from the rain by a broad-brimmed hat like the one I am wearing in the picture over on the right. What is it about the rain that brings him out?