The purpose of this study is to investigate the main factors of the air temperature distribution in basin city in summer. Hadano is a basin city located in Kanagawa. At first, authors measured the air temperature of 14 points in Hadano during the summer (July 13 - August 31) in 2011. As a result, the spatial distribution patterns of the maximum and minimum temperature are different from each other. In the analyses, authors picked green coverage, ventilation condition, amount of solar radiation and elevation, as main factors of forming air temperature distributions. As a result, daytime temperature is influenced by the ventilation and nighttime temperature is strongly influenced by green cover.
