Abstract: The discussion is mainly based upon the meteorological and phenological observations at the Institute of Meteorology, Pei-Chi-Ko,Nanking (Lat 32°03'N.,Long. 118°47'E,Alt. 67.9 meters),during the seven years 1929-1935.January is the coldest month in Nanking. Northerly winds gre frequent.Temperatures as below 0℃. are very common.On January 27, 1933,a reading of -13.8℃ has bew registered, which is the lowest temperature ever recorded in Nanking.February is the coldest month second to January. Weather during this month remains almost the same as the preceding month.