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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).
Scientists estimate that more than half of all the world's plant and animal species live in tropical rainforests. Tropical seasonal forests , also known as moist deciduous , monsoon or semi-evergreen (mixed) seasonal forests, have a monsoon or wet savannah climates (as in the Köppen climate classification ): receiving high overall rainfall ...
Humid temperate rainforest in Termas Geométricas near Coñaripe, Chile. For temperate rainforests of North America, Alaback's definition [1] is widely recognized: [2] Annual precipitation over 140 cm (55 in) (KJ) Mean annual temperature is between 4 and 12 °C (39 and 54 °F).
In northern Idaho rainforest patches along the Clearwater River, a mean annual temperature of 5.4°C has been measured. [8] In British Columbian Inland rainforest areas, the mean annual temperature ranges from 2.7 to 4.5°C. In the coldest months, the mean temperature of these region lies between -8 and -9.5°C. [9]
The tropical wet forests of North America have an average year-round temperature between 68 and 78.8 °F (26.0 °C). Thus, frost does not occur under these conditions. [2] The temperatures remain fairly uniform throughout the year; therefore there is not a change of seasons. There is also no dry season, as all months experience precipitation.
Grasslands often occur in areas with annual precipitation is between 600 mm (24 in) and 1,500 mm (59 in) and average mean annual temperatures ranges from −5 and 20 °C. [35] However, some grasslands occur in colder (−20 °C) and hotter (30 °C) climatic conditions.
The year-round average temperature within the region is 10 °C. [3] Levels of precipitation vary with the seasons as well, with the highest levels of precipitation, averaging 95 mm/month, occurring in May and August, and the lowest, averaging 60 mm/month, occurring in June and the winter months of January, February, March, and December. [ 4 ]
These forests represent a range of habitats influenced by monsoon (Am) or tropical wet savanna (Aw/As) climates (as in the Köppen climate classification). Drier forests in the Aw/As climate zone are typically deciduous and placed in the Tropical dry forest biome : with further transitional zones ( ecotones ) of savannah woodland then tropical ...