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Concept
Tropical climate
Summary
Tropical climate is the first of the five major climate groups in the Köppen climate classification identified with the letter A. Tropical climates are defined by a monthly average temperature of 18 °C (64.4 °F) or higher in the coolest month, and feature hot temperatures all year-round. Annual precipitation is often abundant in tropical climates, and shows a seasonal rhythm but may have seasonal dryness to varying degrees. There are normally only two seasons in tropical climates, a wet (rainy / monsoon) season and a dry season. The annual temperature range in tropical climates is normally very small. Sunlight is intense in these climates.
There are three basic types of tropical climates within the tropical climate group: tropical rainforest climate (Af), tropical monsoon climate (Am) and tropical wet and dry climate or tropical savannah (Aw for dry winters, and As for dry summers), which are classified and distinguished by the precipitation and the precipitation levels of the driest month in those regions.
The Köppen climate classification is one of the most widely used climate classification systems. It defines a tropical climate as a region where the mean temperature of the coldest month is greater than or equal to 18 °C (64.4 °F) and does not fit into the criteria for B-group climates, classifying them as an A-group (tropical climate group). A-group regions are usually found in the tropics, below 23.5 latitude in both the southern and northern hemisphere; they include areas around the Equator, Central America, North-central portions of South America, central Africa, southern portions of Asia and parts of North Australia and the Pacific Ocean islands.
In Group A, there are three types of this climate: the tropical rainforest climate (Af), tropical monsoon climate (Am) and tropical wet and dry or savanna climate (Aw or As). All of the three climates are classified by their Pdry (short for precipitation of the driest month). Tropical rainforest climate's Pdry should be greater than or equal 60 mm (2.4 inches).
Official source
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