Dry-bulb and wet-bulb temperature in classrooms at the School were measured from April through July in 1990, by means of an Assmann ventilated psychrometer. The thermal sensation of the female students was surveyed by a questinnaire at the same time. Correlation coefficients between the rates of thermal sensation and thermal indicators such as natural temperature, relative humidity, effective temperature and discomfort index were computed. And multiple regressions equations of these indications and partial corelation coefficients were also computed from the temperature and humidity. These data showed that the students' thermal sensation in this season is primarily influenced by temperature and not so much by humidity. The relation between temperature and the rate of students who feel the heat was discussed.