Background
The pilot had completed several touch-and-go landings at one airport before proceeding to another local airport within 5 miles.
Flight
While entering the downwind leg of the traffic pattern at the destination airport, the pilot observed a windsock that indicated calm winds. He configured the airplane for a short field landing, using 30 degrees of flaps and an approach airspeed of 75 knots.
Landing and Excursion
The pilot stated that the airplane touched down long on the runway, but he believed he could still stop the airplane on the remaining runway length. He applied heavy braking, but the airplane continued beyond the runway surface, crossed a state road, and came to rest in a ditch.
Post-Landing Observation
After exiting the airplane, the pilot observed that the windsock now indicated a direct tailwind for the landing runway, contrary to the earlier indication.