Based on conventional observation data during power transmission line galloping processes which happened 38 times from 2007 to 2017 in northern Hebei, the temporal-spatial distribution characteristics of transmission line galloping and the relative meteorological factors were analyzed, and meteorological indices for transmission line galloping were obtained. The results are as follows: (1) The transmission line galloping in the northwest mountainous regions was more than that of the eastern coastal, which showed a slightly decreasing trend, but it was not significant. The high incidence period was from April to May, while in the eastern coastal it showed an increasing trend year by year, and passed the significance test of 0.05. The high incidence period was November. Over the past 11 years, the Gutai I line in Guyuan, Fengning and Chicheng had the most galloping accidents than others. (2) Before and after transmission line galloping, the meteorological factors needn’t have high-frequency changes. However, it was necessary to reach a certain threshold range at the same time before galloping occurrence, and the meteorological factors increased, decreased or remained unchanged in the threshold range. (3) A warmer layer or inversion layer existed near 700-850 hPa when the transmission line galloping occurred, the difference between temperature and dew point temperature below warmer layer or inversion layer was less than 2 ℃, and the water vapor in the air reached near saturation and saturation, the relative humidity was relatively small in the high-level. (4) Transmission line galloping occurred under the weather conditions of freezing rain, sleet, sleet and snow. (5) Based on the historical surface meteorological observation data and sounding data in northern Hebei, the prediction model of galloping weather was tested. It was found that the galloping situation of transmission line in northern Hebei was predicted well, which had certain guidance for the meteorological service of power grid.