At about 1100 Pacific time, a Beech S35 struck a tree in flight near Weed and then landed uneventfully at Colusa County Airport. The pilot was not injured. The pilot said he was cruising from Medford, Ore., to Fullerton, Calif., and he was distracted and looked down. When he looked up, he was in the clouds. He heard a loud thump or bang and immediately entered a climb. The pilot then made a planned fuel stop at Colusa and discovered that the right wing leading edge was crushed, the bottom of the right wing was punctured, and the leading edge of the right stabilizer was slightly crushed.