Abstract: The composition of urban morphology has a significant impact on local meteorological conditions and urban living environment.Based on the local climate zones (LCZ) theory and the observational data of automatic weather station from 2018 to 2022,this study analyzed the composition of urban morphology and the distributions of climate comfort index and its main influencing factors in Beijing,and quantified the differences in meteorological conditions and human comfort index in different urban functional areas.The results indicate that the urban area of Beijing is composed of 10 types of building underlying surfaces and 6 types of natural underlying surfaces,and the building underlying surfaces account for 52.0% of the total area,among which the open mid-rise buildings (LCZ 5) has the greatest contribution and the low regatation area (LCZ-D) has the widest distribution in the natural surface type.The main factors affecting climate comfort index,such as air temperature,relative humidity,and wind speed,vary significantly across different LCZ underlying surfaces.In general,the climate comfort index is characterized by "comfortable","hot","comfortable",and "freezing cold" in spring,summer,autumn,and winter,respectively.Due to the physical properties of building underlying surfaces and the impact of human heat emissions,urban central areas have better climate comfort index in spring,autumn,and winter,while it is opposite in summer.There is a proportion of 32.5% to 38.2% in the total time for human body feeling "comfortable" on various LCZ underlying surfaces,among which ranking in descending order as LCZ-A,LCZ-B,LCZ-G,LCZ-D,LCZ 7,LCZ 6,LCZ 5,LCZ 8,LCZ 4,LCZ- E,LCZ 3,LCZ 1,and LCZ 2.The climate comfort index is better on natural underlying surfaces than building underlying surfaces,and better on open building underlying surfaces than dense building underlying surfaces,also better for high-rise buildings than medium and low rise buildings.

Key words: Climate comfort index, Urban morphology, Local climate zones, Spatiotemporal anisotropy