In sub-topical city of Hong Kong where summer is hot and humid, the usage of outdoor spacesis often hindered due to thermal discomfort. In order to improve the thermal comfort of the out-door environment and to make urban outdoor spaces delightful places for people to use andenjoy, better understanding of the thermal perception of people in different climatic conditionsis needed. This paper presents the results of a longitudinal outdoor thermal comfort study con-ducted in Hong Kong. The findings of the study reveal that air temperature, wind speed andsolar radiation intensity are the most influential factors in determining the thermal sensation ofpeople. Based on the data collected, a predictive formula for estimating the subjective outdoorthermal sensation has been developed. In accordance to the formula, under typical summer con-ditions in Hong Kong, a wind speed of 1.8 mis is needed for a person in light clothing sittingunder shade to achieve neutral thermal sensation.
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