Abstract
In this paper are shown some differencess between the climatic factors of the central part of Tokyo and those of its western suburbs. The materials used for this research was collected from following seven years, 1932-38.
1. Maximum Air Temperature Little, if any, difference is seen between the maximum temperature in the district from Kitizyozi to Tatikawa and that of the central part of the metropolis, but if we once cross the river Tama to Hino, it suddenly rises about 0.8°C higher, while at Asakawa the temperature is 0.8°C lower than that of the central part. Generally speaking, the maximum air temperature in the western suburbs is rather higher on clear days in summer time.
2. Minimum Air Temperature The minimum temperature gradually falls lower as we go through Kitizyozi to Tatikawa, but at Hino we see an abrupt fall. In summer it falls slowly, but in winter rapidly, -the minimum temperature in the western suburbs in winter is far lower than that of the central part, and it is not seldom that the difference is 4°C or 5°C, especially early in the morning on clear days. At Asakawa the minimum temperature is high as compared with that of Tatikawa and Hino.
3. Range of Air Temperature The range of air temperature in the western suburbs gradually widens as we proceed farther from the centre through Kitizyozi to Tatikawa, but once we cross the river Tama, it takes, a sudden and discontinuous turn, the range being the greatest at Hino. Asakaw a is in the remotest situation and also in the highest elevation, but the range is not so wide. This is probably because Takawo and Kobotoke Hills to the northwest of the village protect it from winds in the winter season, and moreover, the dense woods on the hills temper the change of temperature.
4. Amount of Precipitation The amount of precipitation in winter time is nearly equal in each place, but in July, August and September, it grows gradually greater as we go farther away from the centre to the west.
