Long term series of icing weather phenomenon during 1954-2015 were extracted from the ground observations covering more than 2 400 national level surface stations over China. Then several quality control procedures were carried out, such as meteorological elements inherent consistency check and statistical check by using 30-year climate normal. Especially, we paid much attention on the following two situations when checked the time series. The first one was that a part of national stations under the historical guidance for simplifying observation did not measured and recorded the icing weather phenomenon before the year of 1981, and the other one was that the annual icing days from hundreds of stations in several years before 1981 were less than their normal values with remarkable differences. The results showed that, 662 stations actually did not take the mission of icing weather observation in the whole of 6 328 years during 1954-1979, which were mainly distributed in Hebei, Jiangsu, Jiangxi, Henan, Hubei, Hunan and Shaanxi provinces. Before 1981 there were also other 1 453 years from 839 stations obtaining much less icing weather records when compared to the normal of 1981-2000. Based on the raw data and the quality controlled data, we calculated the national mean values of annual icing days during 1961-2015. It illustrated that the raw data had an upward trend with about 2.0 days for every decade while the quality controlled data showed a declined trend of -1.5 days per decade. The national mean annual days of daily minimum air temperature lower than -1℃ had a high correlation (0.92) with the quality controlled national icing day series, which indicated the decline trend of icing days was acceptable. The annual mean icing day of the stations to the south of Latitude 25°N and of the stations in Sichuan Basin were almost less than 10 while it was greater than 200 in the northwest of Heilongjiang, northeast of Inner Mongolia, and Qinghai-Tibetan Plateau. We also analyzed the variations of the icing duration over Northern China from 1971 to 2015 by choosing 708 stations which were all located to the north of Latitude 35°N with consecutive observations. The average value of annual icing duration of Northern China was about 149 days with a downward trend of -2.1 days per 10 years. The icing duration of 288 north stations significantly reduced in the past 45 years, and the starting dates of icing duration from 155 stations were delayed, while the ending dates of 144 stations were brought forward.
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