This study was carried out to evaluate the effect of open space on temperature chang. In open space, lower temperature zones were formed, while high temperature zones were developed around urban areas. In forests and on water within open space, marked temperature reduction was recorded. The 10 % increase of the ratio of green space within fifty meters around the observation point decreased 0.33~0.43$^{circ}C$ from the maximum temperature and 0.20~0.$25^{circ}C$ from the minimum temperature. The increase of ten trees in the area decreased 0.33~0.49$^{circ}C$ from the maximum temperature and 0.20~0.23$^{circ}C$ from the minimum temperature.