This paper explored the urban temperature variation in Nanjing City of southern China in past 55 years.The observed meteorological data during 1951 to 2005,including average mean temperature,maximum temperature,and minimum temperature in annual,seasonal and daily time scales,have been used to study the characteristics of temperature changes in different time scales in Nanjing City.The linear statistical method was used to analyze the temperature change trend by the time scale.The results show that,the tempe...