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Amazon rainforest, Manaus, Brazil. Tropical rainforests have a type of tropical climate (at least 18 C or 64.4 F in their coldest month) in which there is no dry season—all months have an average precipitation value of at least 60 mm (2.4 in). There are no distinct wet or dry seasons as rainfall is high throughout the months.
Average annual rainfall is no less than 1,680 mm (66 in) and can exceed 10 m (390 in) although it typically lies between 1,750 mm (69 in) and 3,000 mm (120 in). [5] This high level of precipitation often results in poor soils due to leaching of soluble nutrients in the ground. Tropical rainforests exhibit high levels of biodiversity.
In order to be defined as a rainforest, the forest must average at least 140 cm (55 in) of precipitation annually and a temperate rainforest as opposed to a tropical rainforest is defined by a mean annual temperature between 4 and 12 degrees Celsius (39 and 54 degrees Fahrenheit).
They are generally found at altitudes ranging from 600 to 1,000 m (2,000 to 3,300 ft), and receive 2,000 to 6,000 mm (79 to 236 in) of average annual rainfall. [15] [16] [17] Despite being located in the temperate zone, the Azores rainforest is similar in many ways to the cloud forest environments of the tropics and subtropics.
[citation needed] The rainforest receives an average of 140 inches (360 cm) of annual precipitation—among the rainiest places in the United States. [1] [2] The Hoh River valley was formed thousands of years ago by glaciers and is the ancestral home of the Hoh people. Within Olympic National Park, the forest is protected from commercial ...
A natural rainforest emits and absorbs vast quantities of carbon dioxide. On a global scale, long-term fluxes are approximately in balance, so that an undisturbed rainforest would have a small net impact on atmospheric carbon dioxide levels, [32] though they may have other climatic effects (on cloud formation, for example, by recycling water ...
This results in a substantially lower average rainfall in July and August in the southern rainforest patches than in the rest of the year, leading to a generally drier summer than in the North where the summers are cool and wet. [13] In general, mean annual precipitation ranges between 700 and 1,500mm. [14]
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 °F) or higher in the coolest month, featuring hot temperatures and high humidity all year-round.