Based on temperature humidity index (THI), wind-chill index (WCI) and index of clothing (ICL), a new model of comprehensive comfort index is founded. The climate comfort degree of 41 cities in China is analyzed by the new model, and the grades of fitness and its temporal distribution are divided. The climate comfort degree of each season and North-South variation of climate comfortable degree are analyzed. The 41 cities are divided into four types based on the distribution of comfort period in a year. The kind of summer fitness includes Haerbin, Changchun, et al. Its uncomfortable period is quite long, and the variation of comprehensive comfort index likes an inverted “U”. The kind of spring and autumn fitness includes Beijing, Tianjin, et al and the variation of comprehensive comfort index likes “M”. The kind of winter fitness includes Guangzhou, Shenzhen, et al and the variation of comprehensive comfort index likes a wide “U”. The kind of all year fitness only includes Kunming and the variation of comprehensive comfort index likes a wide inverted “U”. The annual comprehensive comfort index in 25°N is the highest; the annual comprehensive comfort index goes up as the latitude reduces in the north of 25°N, the annual comprehensive comfort index goes down as the latitude reduces in the south of 25°N. In summer, the comprehensive comfort index goes up as the latitude increases, which shows that the climate in the North is more comfortable. In winter, the comprehensive comfort index goes up as the latitude reduces, which shows that the climate in the South is more comfortable.

climate comfort degree; temperature humidity index (THI); comprehensive comfort index; differences between North and South