Background
According to the pilot, he decided to depart a day early due to forecasted weather along his intended route. The airplane was not equipped for instrument flight.
Flight Events
Approximately two hours after departure, the pilot encountered fog and elected to land, refuel, and wait for weather to clear. After waiting about 1.5 hours, he took off and again encountered fog, turning back to land at the same airport. He waited several hours on the ground, checked weather, and took off again. After several more minutes of flight, he again encountered fog.
Collision with Trees
The pilot wrote in his statement, "...told (passenger) looks like weather is getting [bad]...[and] we were returning to [home airport]...I made a 180 degree turn, was setting my LORAN...when encountered fog, next thing I saw was trees...." The airplane impacted trees and came to rest with the engine resting on a rock and still running.