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Glenn T. Trewartha has produced several modifications of the Trewartha's Climates Classification in his book 'An Introduction to Climate' (1980). The climate classification system devised by Trewartha represents a compromise between purely empirical and genetic methods. Besides being simple and explanatory, it combines the basic fundamentals of the empirical as well as the genetic classification schemes. Trewartha recognized only a limited number of principal climatic types, usually under 15. However if required, he was in favor of adding numerous second-and third-order sub-divisions within a climatic type or region as the case may be.
2. Main article
The aims and objectives of Trewartha's climatic classification are very clear. First and foremost, they must be guided by the observed data. In this way he is more in favor of empirical method of climatic classification. From utilitarian point of view, he considers such a type of classification as superior to genetic classification of climate.
3. References
However, at the same time he also recognizes the merits of the genetic type of climatic classification. He was convinced that as far as possible genetic classification must supplement the empirical classification of climates. The following climatic classification as proposed by Trewartha is a highly modified form of the most widely accepted classification scheme of Koppen. like many other climatic classifications. Trewartha also made use of the two most important and basic weather elements, i.e., temperature and precipitation as the basis for his own classification.
Trewartha has classified world climates in 6 great climatic groups out of which five (A,C,D,E,F) are based on temperature criteria, and the sixth (B) is the dry group based on precipitation.
