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Abstract: Based on a new algorithm to calculate apparent temperature, a novel criterion to evaluate human comfort levels was devised and applied to calculate climate comfort by using daily routine surface observational data from 1 January 1961 to 31 December 2012. Based on daily mortality from circulatory system disease and Nanjing meteorological data from 1 January 2005 to 31 December 2008, characteristics of comfort levels and apparent temperature during this period were analyzed. Then, the relationship between comfort levels and mortality was analyzed. The hot uncomfortable days show an upward tendency, however cold uncomfortable days show a downward tendency (-3.2 d/10a). Early April to mid-May and October are two comfortable periods in Nanjing. Mean apparent temperature has a rising tendency (0.3℃/10a) after 1995. Main comfort levels are comfort and slightly cold in Nanjing during the period of 2005-2008. Peak days of mortality from circulatory system disease occur in cold uncomfortable days. There was a successive high mortality period in 2008, which has a 7-9 d lag compared with the weather disasters process during this period.

Key words: apparent temperature, golden section, peak days of mortality from circulatory system disease, comfort level