Reduction of apparent temperature under urban trees in a hot-humid green area

A thermo-hygrometric analysis was carried out at 9, 12 and 16 hrs, under six groups of urban tree species with different levels shading, plus a lawn as control area, on hot humid day November 2018 in Campos dos Goytacazes, Rio de Janeiro. Air temperature relative humidity data were converted into apparent heat indexes (HI). The results obtained subjected to variance and, if significant, regression performed. Shading calculated using five fisheye photos taken each group species, order obtain mean sky view factor (SVF) for location. Values SVF HI evaluation time Pearson’s correlation analysis. There significant difference within the trees three times. maximum (43.91°C) recorded midday. On there positive between times, it higher noon. Increased sunlight exposure, due decreased blockage, causes increase HI.