Thermal comfort conditions in an E-W oriented street canyon in Freiburg (Germany) during the European summer heatwave 2003

The thermal comfort conditions were analyzed for people within a street canyon, a medium sized city in the southern upper Rhine plain, during the summer heatwave 2003. Continuous measurements of all meteorological data necessary to calculate PET that is air temperature T_a, vapor pressure VP, wind speed v, and short and long wave radiation flux densities from the three-dimensional (3D) surroundings of a standing person were carried out. The diurnal cycle of T_a, VP, and v as well as relative humidity RH shows patterns that are typical of extremely hot summer days in Freiburg. The results of the net-short-wave radiation K* reflect the local measurement conditions at the northern sidewalk of the E-W street canyon.