In this study, daily cycles of activities in dwellings and their variation between summer and winter, were observed and described in the case of housewives who lived in a public housing development located in Tokyo suburbs. In order to make the description intelligible, the daily cycles of occurrence rates of properly grouped activities and occupancy rates of rooms were illustrated in several diagrams, and the time allocation tables for some time periods which were properly fixed according to the valiations of the rates were made.