Abstract
With the mean values of meteorological elements only, it is not complete to express the climate at a place. But if the frequency of observed values for an element be possible to be calculated as a mathematical formula, e. g. where x is the observed value and β, h, x0, _??_, are constants. By two constants for one element the climate can be more completely expressed.
The constants β, h, x0, _??_ take different values by following weather conditions, such as fine, rainy, etc. Accordingly, these quantities are used for the weather forecasting.
As such elements: temperature difference between the summit and middle station of Mt. Tsukuba and vapour tension at 6 a. m. are used. These quantities have been considered as valuable elements for the weather forecasting, as Mr. Takayama, Dr. Fujiwara and the others already noticed A graph is made by the statistical investigation of temperature difference and vapour tension taking into account of the wind direction at that time. To obtain this graph is the main object of the pr_??_sent paper as the author believes that it must be useful to foresee the occurrence or unoccurrence of rain in the next day.
