A yaw auto-calibration method configured to calibrate at least one anemometer of a yaw control system to correct for yaw misalignment, the yaw control system configured to adjust a wind turbine nacelle position about a yaw axis (A) to align the wind turbine with the direction of the wind inflow, the yaw auto-calibration method comprising: collecting wind turbine data over a plurality of time periods with respect to the at least one anemometer, the wind turbine data including one or more of mechanical speed, wind speed, turbine power, and wind direction; determining from the collected data a wind direction compensation signal associated with a plurality of operational parameter ranges; the wind direction compensation signals corresponding to the effects on the at least one anemometer due to yaw misalignment; providing the wind compensation signals to the yaw control system to adjust the wind direction data of the at least one anemometer for each of the associated operational parameter ranges; characterized in that the step of collecting includes calculating an average operational parameter and an average wind direction for each time period of the plurality of time periods for the at least one anemometer and binning the average operational parameter and average wind direction for each time period in a bin location based on a range of operational parameters and a range of wind directions; a performance value correlated to the average power of the electrical generator and the average wind speed is calculated for each time period and is associated with the binned average operational parameter and average wind direction for that time period; the step of determining a wind direction compensation signal associated with an operational parameter range includes plotting for each operational parameter range a performance value calculated over the plurality of time periods against its corresponding average wind direction; and the operational parameter includes one or more of rotor speed, generator speed and turbine power. collecting wind turbine data over a plurality of time periods with respect to the at least one anemometer, the wind turbine data including one or more of mechanical speed, wind speed, turbine power, and wind direction; determining from the collected data a wind direction compensation signal associated with a plurality of operational parameter ranges; the wind direction compensation signals corresponding to the effects on the at least one anemometer due to yaw misalignment; providing the wind compensation signals to the yaw control system to adjust the wind direction data of the at least one anemometer for each of the associated operational parameter ranges; characterized in that the step of collecting includes calculating an average operational parameter and an average wind direction for each time period of the plurality of time periods for the at least one anemometer and binning the average operational parameter and average wind direction for each time period in a bin location based on a range of operational parameters and a range of wind directions; a performance value correlated to the average power of the electrical generator and the average wind speed is calculated for each time period and is associated with the binned average operational parameter and average wind direction for that time period; the step of determining a wind direction compensation signal associated with an operational parameter range includes plotting for each operational parameter range a performance value calculated over the plurality of time periods against its corresponding average wind direction; and the operational parameter includes one or more of rotor speed, generator speed and turbine power. <EOS>