Abstract: | Daily data of ground observation from 12 stations in Zunyi during the period of 1960-2020 was used to assess the space-time distribution characteristics of snowfall by general statistical methods,and the data from NCEP was further used to analyze the circulation characteristics of three blizzard cases in Zunyi. Results indicated that number of annual snowfalls was fluctuated and showed a decreased pattern from 1960 to 2020. The average snowfall days per month was shown in an unimodal feature and the peak was present in January. Furthermore, the number of average snowfall days per month at each site in January and February was significantly higher than in other months. In terms of the spatial characteristics, there were more snow days on the line from Xishui in the northwest to Fenggang in the east than in other areas of Zunyi, and the distribution of snowfall days was positively correlated with the elevation of the stations located. In addition, there were points in common about the circulation patterns of each layer of blizzard cases since 2000 that warm and humid air climbs over the cold pad, creating blizzard conditions. |