Although some aspects of climatological elements, such as air temperature and precipitation, have been considerably studied from the statistical or descriptive point of view, very few have been done for the wind conditions. Recently, by compiling the cards, the wind statistics can be adequately made with the aids of machine and therefore it makes us possible to study the climatological aspects of winds in detail.<br> Firstly, the annual march of the wind velocity was presented using the mean value of every half decade. Types of the annual march are grouped into five:<br>1) Mountain type. As shown in Fig. 1 (A), an example on the summit of Mt. Fuji (3772m, 35°21'N, 138°44' E) shows a quite distinctive change having a great annual range with several fluctuations. The annual range is 15 m/s on Mt. Fuji, 6 m/s on Mt. Ibuki (1375m, 35°25'N, 136°24' E), and 3 m/s on Mt. Tsukuba (868m, 36°13'N, 140°06'E).<br>2) Japan Sea Coast type. Maximum appears in winter and minimum appears in July. An example at Akita (9.1 m, 39°43'N, 140° 06'E) is given in Fig. 1 (B).<br>3) Cape or Island type. The stations at capes or on islands on the Pacific Coast show maximum in winter and minimum in summer like the Japan Sea Coast type. But the annual range is greater than 4 m/s as shown by the example of Omaesaki (44.7 m, 34°36'N, 138°13'E) in Fig. 1 (C).<br>4) Plain type. The annual change is generally 2-3 m/s with maximum in January or April and mini-mum in late July-early August or October. Excepting this, however, this type does not show any special feature. The stations in the plains along the Pacific Coast and Kyushu show this type. An example of this type at Tokyo (4.1 m, 35°41'N, 139°46'E) is given in Fig. 1 (D).<br>5) Inland type. The stations situated in the mountainous regions have this type showing very small fluctuation through the year. The annual chang is smaller than 2 m/s as shown in Fig. 1 (E).<br> Secondly, the distribution of days with daily maximum wind velocity of more than 10 m/s in January and in April, 20 m/s in April, and 10 m/s in the year is given in Fig. 2. Contrasts between inland area and coastal area and between north, Hokkaido and northern Tohoku, and south, Kyushu, must be worthy to note. Then, it is shown that a cumulative curves of the daily maximum wind velocity at various stations present a characteristic feature of the winds respectively as shown in Fig. 3.<br> Thirdly, investigation into the relationships between “the ration of wind velocity on the summit to that at the mountain foot” and “the difference of height between these two stations” was made. The experimental formula for this relationship was made for the respective 10, 25, 50, 75, and 90% frequencies of the cumulative curve. In this case, the wind velocity means the daily maximum wind velocity in/s and, for instance, 10% means 37 days of a year. The experimental formula in the case of 10% frequency:<br>_??_<br>where V₂ and V₁ are the wind velocity at the summit and the mountain foot stations and H₂ and H₁ are the height above sea level in m. at the respective stations.<br> Finally, a diagram showing the annual change of the diurnal variation of wind velocity was studied. Figs. 4 (A)-(E) give examples of the diagram for various situations. Wajima (5.6 m, 37°23' N, 136°54'E) may represent stations on the Japan Sea Coast, Matsumoto (610 m, 36°15' N, 137°58' E) those in the inland area, Tokyo those in the plains, Torishima (80.7 m, 30°29'N, 140°18'E) those on the islands, and Mt. Fuji those on the high mountain.