Thermal environment, especially air temperature distribution, inside the semiclosed arcade located at Nagasaki was investigated on field observations both in summer 2000 and in winter 2001. Air temperature at the height of 1.0 meter in the occupied zone was a little higher than outside air temperature both in summer and in winter. In the daytime of summer, vertical distribution of air temperature showed a slope of high temperature in the upper part and low temperature in the lower part. However, both in the nighttime of summer and winter, vertical distribution of air temperature did not show a slope.
