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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.
Tropical rainforests are a type of tropical moist broadleaf forest, that includes the more extensive seasonal tropical forests. [3] True rainforests usually occur in tropical rainforest climates where no dry season occurs; all months have an average precipitation of at least 60 mm (2.4 in).
Amazon rainforest nearby Iquitos, Perú. Tropical climates normally have only two seasons, a wet season and a dry season. Depending on the location of the region, the wet and dry seasons can have varying duration. Annual temperature changes in the tropics are small.
(note: Af in light green is Tropical rainforest). Seasonal tropical forest, also known as moist deciduous, semi-evergreen seasonal, tropical mixed or monsoon [1] forest, typically contains a range of tree species: only some of which drop some or all of their leaves during the dry season.
Most places have only one wet season, but areas of the tropics can have two wet seasons, because the monsoon trough, or Intertropical Convergence Zone, can pass over locations in the tropics twice per year. However, since rain forests have rainfall spread evenly through the year, they do not have a wet season. [6]
Near these latitudes, there is one wet season and one dry season annually. At the equator there are two wet and two dry seasons, as the rain belt passes over twice a year, once moving north and once moving south. Between the tropics and the equator, locations may experience a short wet or a long wet season; and a short dry or a long dry season.
Tropical rainforests have been called the "jewels of the Earth" and the "world's largest pharmacy", because over one quarter of natural medicines have been discovered there. [ 2 ] Rainforests as well as endemic rainforest species are rapidly disappearing due to deforestation , the resulting habitat loss and pollution of the atmosphere .
Each separate tribal group traditionally observes different seasons determined according to local criteria that can vary from the hibernation of polar bears on the arctic tundras to the growing seasons of plants in the tropical rainforests. In Australia, some tribes have up to eight seasons in a year, [19] as do the Sami people in Scandinavia ...