A method for determining a characteristic curve for an electric variable (P el, Q, (p, cos φ, I P, I Q) of a wind turbine, wherein the characteristic curve contains characteristic values of the electric variable (P el, Q, φ, cos φ, I P, I Q) depending on different values of the wind (vw), the method comprising the following steps: • at least one characteristic value of the electric variable (P el, Q, φ, cos φ, I P, I Q) is measured for at least one value of the wind (v W), • for the at least one value of the wind (v W), a characteristic value of the electric variable (P el, Q, φ, cos φ, I P, I Q) of a predetermined characteristic curve which contains characteristic values of the electric variable (P el, Q, (p, cos φ, I P, I Q) as a function of different values of the wind (vw) is adapted, taking into account the characteristic value measured for the at least one value of the wind (v W), characterised in that: o the number (n) of the characteristic values of the electric variable (P el, Q, φ, cos φ, I P, I Q) measured for one value of the wind (v W) is determined and the adaptation of the characteristic value is performed depending on the number (n) of the measured characteristic values measured for the respective value of the wind (vw), and o the characteristic value of the predetermined characteristic curve and the at least one measured characteristic value are weighted in a calculation of the adapted characteristic value, provided that the number (n) of the characteristic values of the electric variable (P el, Q, φ, cos φ, I P, I Q) measured for the respective value of the wind (v W) is below a limiting number. • at least one characteristic value of the electric variable (P el, Q, φ, cos φ, I P, I Q) is measured for at least one value of the wind (v W), • for the at least one value of the wind (v W), a characteristic value of the electric variable (P el, Q, φ, cos φ, I P, I Q) of a predetermined characteristic curve which contains characteristic values of the electric variable (P el, Q, (p, cos φ, I P, I Q) as a function of different values of the wind (vw) is adapted, taking into account the characteristic value measured for the at least one value of the wind (v W), characterised in that: o the number (n) of the characteristic values of the electric variable (P el, Q, φ, cos φ, I P, I Q) measured for one value of the wind (v W) is determined and the adaptation of the characteristic value is performed depending on the number (n) of the measured characteristic values measured for the respective value of the wind (vw), and o the characteristic value of the predetermined characteristic curve and the at least one measured characteristic value are weighted in a calculation of the adapted characteristic value, provided that the number (n) of the characteristic values of the electric variable (P el, Q, φ, cos φ, I P, I Q) measured for the respective value of the wind (v W) is below a limiting number. o the number (n) of the characteristic values of the electric variable (P el, Q, φ, cos φ, I P, I Q) measured for one value of the wind (v W) is determined and the adaptation of the characteristic value is performed depending on the number (n) of the measured characteristic values measured for the respective value of the wind (vw), and o the characteristic value of the predetermined characteristic curve and the at least one measured characteristic value are weighted in a calculation of the adapted characteristic value, provided that the number (n) of the characteristic values of the electric variable (P el, Q, φ, cos φ, I P, I Q) measured for the respective value of the wind (v W) is below a limiting number.