According to the pilot, he was departing runway 16 on an instrument flight rules flight plan. After traveling down approximately two-thirds of the 4,002 foot runway, he elected to abort the takeoff after he felt the airplane was not able to climb and continue to accelerate. During the aborted takeoff, the airplane departed the runway surface and entered the grass overrun area which was covered with wet dew from the morning environmental conditions. The pilot attempted to stop the airplane; however, the airplane skidded and impacted a fence. The airplane sustained substantial damage to the right main wing spar and fuselage. The examination of the airplane revealed no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operations.