The pilot stated that he was attempting a soft-field takeoff from a turf runway that he described as “extremely wet and soggy with tall grass.” The airplane became airborne approximately halfway down the 2,500-foot-long runway, and the pilot reported that climb performance was degraded due to hot weather conditions. During the climb, the left landing gear impacted a line of trees past the runway end. The pilot stated that he was unable to maintain airspeed, and the airplane subsequently stalled and impacted an open field, resulting in substantial damage to the left wing. The fuselage was consumed by post-crash fire. The pilot reported there were no mechanical malfunctions or anomalies that would have precluded normal operation of the airplane.