Based on human-biometeorological measurements at two different sites within a street canyonin the city of Freiburg (southwest Germany), the shading influence of the canopy of street treeson human thermal comfort was investigated for a typical Central European summer day withinthe scope of the joint research project KLIMES. The physiologically equivalent temperaturePET was used to quantify the level of human thermal comfort. The lower PET values under thetree canopies point out the lower level of thermal stress compared to an adjacent site, which wasnot directly shaded. The total radiation heat aggregated in the mean radiant temperature mainly determined the PET conditions at both sites, which is typical of Central European citieson summer days. To a considerable extent, Tm was influenced by the long-wave radiativefluxes from the four main horizontal directions. The mean contribution of the total short-waveradiation on T_mrtamounted to 10 % under the tree canopies and 29 at not directly shadedsite.
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