Based on daily precipitation data of 17 national ground meteorological observation stations in Shijiazhuang since their establishment to 2019, the temporal and spatial characteristics of snowstorm days were analyzed, and the temporal variation characteristics of snowstorm days at 5 representative stations with different geographical environments were further analyzed by using Morlet wavelet analysis and sliding t-test methods. The results are as follows: (1) The snowstorm days decreased gradually from west to east in Shijiazhuang, and there were more snowstorm days in mountain area than in plain, and the urban area of Shijiazhuang was in a high value zone of snowstorm days. (2) The starting date of snowstorm in Shijiazhuang was October 31 at the earliest, and the ending date was April 19 at the latest. (3) From 1972 to 2019, there were 42 days of snowstorm at 17 stations, and greater than or equal to 3, 7 and 10 stations occurring snowstorm accounted for 57.1%, 35.7% and 26.2%, respectively. The snowstorm occurring in the whole region was only 4 days and accounted for 9.5%. (4) The percentage of snowstorm days since 2000 was the largest, and during 2005-2013, snowstorm occurred frequently. (5) The quasi-period and the first major period of snowstorm days in the whole time domain were both more than 10 years at each station, and it was in the period of less snowstorm after 2014 at five representative stations. (6) The time series of snowstorm days at 4 representative stations were abrupt. (7) The spatial distribution of maximum and average precipitation on snowstorm days in Shijiazhuang showed larger in mountain area than in the plain, and the large value center was in the urban area of Shijiazhuang.

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.

Based on the hourly minimum visibility, precipitation and relative humidity of 61 national meteorological stations during the period 2016-2017, the characteristics of low visibility along eight main highways in Hebei Province were investigated. The results show that low visibility appeared most in autumn and winter while least in spring. In autumn and winter, the 02:00-03:00, 03:00-07:00, 05:00 were the peak hours for the appearance of  low visibility of 200-500 m, 50-200 m and 0-50 m, respectively. The frequency of  low visibility along Daqing-Guangzhou highway (Beijing-Hengshui section and Hengshui-Daming section), Shijiazhuang-Anyang highway and Qingdao-Yinchuan highway was higher, while it was lower along Beijing-Qinhuangdao highway and Coastal highway. The low visibility of 200-500 m usually appeared from 20:00 to 07:00. The frequency of low visibility of 200-500 m along Hengshui-Daming section, Shijiazhuang-Anyang highway and Qingdao-Yinchuan highway was higher after 00:00, while it was opposite for Beijing-Qinhuangdao highway. The visibility of 50-200 m along Beijing-Hengshui section and Qingdao-Yinchuan highway occured mainly during 04:00-07:00, and it occured maily during 05:00-08:00 along Beijing-Shanghai highway and Shijiazhuang-Huanghua highway. The peak time of frequency of the visibility of 50-200 m occured during 03:00-07:00 along Shijiazhuang-Anyang highway. The frequency of the visibility of 0-50 m along various highways decreased significantly.The peak value of low visibility of 0-50 m occured mainly at 00:00 and 05:00 along Beijing-Hengshui section(Raoyang-Anping section), while it occurred during 03:00-07:00 along Hengshui-Daming section. The low visibility of 0-50 m was easier  to  occure along Botou section of Shijiazhuang-Huanghua highway than other sections  of  that.