CLIMATIC DIAGRAMS 7 



This area is shown in black (Fig. 5, cHmatic diagram of Douala) and is a 

 perhuniid season. 



In the equatorial region the temperature shows a much larger daily than 

 seasonal variation. Therefore it is necessary to give additional figures : the 

 mean daily maximum of the hottest month, the absolute maximum tem- 

 perature and the amphtude of the mean daily variation of the temperature 



(Fig- 5). 



The diagrams of all dd meteorological stations of AnatoHa were drawn 



and attached to a large wall map of Anatoha. At a glance one could see 



the distribution of the main cUmatic types without any interpolation. This 



was also accomplished for Iraq during a visit to Baghdad. Later on the 



same method was apphed to Africa, while the maps were pubhshed in 



Germany. Since they proved to be very useful, we decided to prepare a 



world atlas of the climatic diagrams. The first part is already pubhshed 



by VEB Gustav Fischer- Verlag Jena and comprises the complete Southern 



Hemisphere, India, the Near East, the Iberian Peninsula and Western 



Europe. Maps of the other parts of the world are in preparation and will be 



pubhshed next year. 



It is impossible to show the diagrams of all stations on the maps or 

 chmatic cartograms of the world atlas because the scale of the maps is too 

 smaU. It is necessary to unite diagrams of the same type to groups and 

 to show only the distribution of these on the maps with diagrams of 

 one or two stations as examples. The position of each station is shown on 

 the maps by a number. The diagrams of these stations are listed under 

 the same number on supplementary sheets. 



The following ten principal climatic types are distinguished as indicated 

 by roman numerals : 



I Equatorial type, humid or with two rainy seasons. 

 II Tropical type, with summer rain. 



III Sub-tropical type, hot and arid. 



IV Mediterranean type, with arid summer and winter rams, frost rare. 

 V Warm temperate type, humid, frost rare. 



VI Temperate type, with cold winter, humid. 

 VII Temperate arid type, with a cold season. 

 VIII Boreal type, with a long winter season. 



IX Arctic type, cold, only a short warmer season. 

 X Mountain types, belonging to different chmatic regions. 



The subdivisions of these types are indicated on each map by arable figures 

 or letters. They are prehminary and only when all maps are ready will it 



