Useful notes on Trewartha’s Climatic Classification

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Trewartha modified Koeppen’s Classification. He divided the country into 4 major and 7 sub-types.

1. A type Climate.

This type of climate has tropical rainfall, high temperature and temperature over 18°C in the coldest month. It has 2 sub-types.

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(i) Am.

It is characterized by over 27°C mean annual temperature. Annual rainfall is over 250 cm. The areas are Western Coast, S. Assam, West Bengal and Tripura.

(ii) Aw.

It is characterized by 27°C mean annual temperatures. The annual rainfall is 100 cm. It comes in summer. Sawannah type of vegetation grows. It covers a large part of Peninsula.

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2. B type Climate.

It is characterized by dry conditions. It has three sub-types. (i) Bsh. It is characterized by 27°C mean annual temperature.

Annual rainfall is 50-100 cm. Grassland vegetation grows. It covers Eastern Rajasthan and Gujarat.

(ii) Bwh:

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Hot and Semi-desert climate as in Thar Desert of India.

(iii) Bs. Semi-arid tropical Savannah climate with 27°C mean annual temperature. Annual rainfall is 100 cm. Such climate prevails in the rain shadow areas.

3. C Type Climate.

Sub-Tropical Climate. It has one sub-type.

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Caw.

Dry climate and rainfall in winter due to cyclones. Such climate is from Punjab to Assam.

4. H Type Climate.

Mountain type Climate. It is characterized by low temperature and snowfall in winter. It is experienced in the Himalayan Zone.

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