An optical system for providing crosswind aim point correction for a sniper rifles and similar weapons comprising an optical transmitter, an optical receiver, a display device and a processor. The optical transmitter produces a collimated laser beam for illuminating a spot on the target. The optical receiver receives optical signals transmitted by the optical transmitter and scattered back from the target and converts the optical signals into time varying electrical signals. The processor processes the time varying electrical signals to determine a path weighted average crosswind. The processor is equipped with software that permits it to calculate the path-weighted average crosswind utilizing at least three different methods.