The pilot, who was intending to make a full-stop landing, noticed that there was a crosswind coming from the left as he crossed the runway threshold. During the landing roll, the variable wind changed to a crosswind from the right and the pilot did not adequately compensate for the change in the wind direction. He therefore lost directional control of the airplane, which subsequently departed the left side of the runway and sustained substantial damage to both of its wings. The pilot indicated that there were no mechanical malfunctions related to the accident.