For investigation of the temperature variation characteristics of the overhead transmission line under different meteorological conditions and the influence of wind speed on the effectiveness of the overhead transmission line icing monitoring based on the distributed optical fiber sensing technology,a 3D temperature field model for the ice-covered optical phase conductor is established. The variation characteristics of optical fiber temperature under different ambient temperature,wind speed and icing-thickness are analyzed and obtained using the finite element analysis. From this,the results reveal that the temperature difference between the icing part and the non-icing part is independent of the initial value of the ambient temperature,and the critical wind speed expression separately considering the rate of ambient temperature change or icing-thickness is provided. In addition,the critical wind speed value under the ambient temperature change rate and icing-thickness within the common range is presented. Based on the wind speed value and interpolation,a more accurate critical wind speed value can be given under the ambient temperature change rate and icing-thickness within the common range. It provides a reference for researching the temperature variation characteristics of ice-covered overhead transmission lines under different meteorological conditions and the influence of wind speed on the effectiveness of overhead transmission line icing monitoring based on distributed optical fiber sensing technology.