In this research, the effect of transpiration and evaporation on outdoor thermal environment in an area around a residential complex with and without trees were measured in summer, and the following results were clarified. 1) After rainfall, the average outdoor air temperature per day is 0.4K lower in the trees area than that in the no trees area. 2) The average moisture per day is 2.2g/kg' higher in the trees area than that in the no trees area. 3) The evaporation in the shade area is 1/3 to 1/2 times that in the sunny area. 4) The transpiration rate of the south shoots is 2-4 times as much as that of the north shoots. The results show that trees are effective in moderating outdoor air temperature after rainfall.
