The pilot of the ski-equipped airplane reported that, while on approach to a snow-covered airstrip, there was a quartering right gusting crosswind. He added that, about 100 ft above the ground, the right wing rose, and he attempted to correct to no avail. He added that the airplane was about 90° off of course to the left, and he chose to go between two trees. Subsequently, the left wing impacted a tree and separated from the airplane, and the airplane came to rest nose down. The airplane sustained substantial damage to the fuselage and left wing. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The automated weather observation system about 9 nautical miles from the accident site reported that, about the time of the accident, the wind was from 280° at 12 knots, gusting to 21 knots. The pilot landed on runway 26.