The pilot reported that the winds were calm during approach, but as the airplane arrived on final approach to land, the wind velocity increased significantly and changed direction. After feeling a strong tailwind, the pilot attempted to perform a go-around and turned the airplane to the right to avoid powerlines and trees. After leveling the airplane’s wings, and while at a height of about 20 ft above the ground, another tailwind gust struck the airplane and the right wing encountered an aerodynamic stall. The airplane’s right wing and nose subsequently impacted the ground before coming to rest in a nearly vertical attitude. The airplane’s wings and fuselage were substantially damaged. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.