Abstract
In the Tokyo district, there are 14 observatories evenly to make hourly meteorological observations. By recording these meteorological data on magnetic tapes at intervals of one hour throughout the year and analyzing them, it is thought possible to grasp positive thermal environments in urbanized areas. This paper consists of outlines of thermal environments in the Tokyo district, analyses of correlations between various meteorological factors and temperature and humidity distributions, analyses of correlations between areas of thermal environments and preparation of widearea thermal environment distribution maps. Temperature distribution are closely related to humidity distributions, and the intensity of these distributions is approximate proportional to the quantity of potential evapotranspiration. A sort of probability theory was used to draw distribution maps. At the center of Tokyo, there are rather many green tracts comparatively, therefore, high temperature areas appear around the center of the urbanized area in summer time, and the large heat-island phenomena are seen at the center of the city in winter time.
