Abstract: According to 300 geographical and historical references the south boundaries of snow events in Guang Dong since 1500 A. D. are given in each half century and compared with the observed south bounrary of snow events of 108 meteorological stations in 1950- 1985. A little variations can be seen in East Guang Dong and all the historical boundaries locate in the south side of the modern boundary in Central Guang Dong. Much variations of the historical boundaries are seen in West Guang Dong, maximum amplitude about 4 latitudinal degrees. The south boundaries of snow events had been found in the north coast of Hainan Island in the seventeenth century and first half of tha nineteenth century.Comparing the absolute minimum temperature of 1950-1985 in Guang Dong, the south bounrary of snow events is equivalent round about to -1℃ isoline. So the absolute minimum temperature of -1℃ was seen in eastern coast of Guang Dong in seventeenth century and first half of eighteenth century. In the north part of Pearl River Delta the absolute minimum temperature of -1℃ or lower occurred in most investigated periods and the absolute minimum temperature of -1℃ also occurred in the south part of Pearl River Delta in seventeenth and nineteenth century. In West Guang Dong the absolute minimum temperature of most investigated periods were lower than the modern one. It would be 2-3℃ lower than modem records in Leizhou Peninsula and Hainan Island in seventeenth and first half of nineteenth century.