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Borneo, with the typical vegetation of tropical forests. 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).
Amazon River rain forest in Peru. Tropical rainforests are hot and wet. Mean monthly temperatures exceed 18 °C (64 °F) during all months of the year. [4] 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]
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).
The average annual temperature is around 27.05 °C (80.69 °F) and has an average annual temperature range of about 3.6 °C (38.5 °F). [14] Distinction between wet and drought seasons, the tropical monsoon climate is different from other tropical climates because of its uneven precipitation throughout the year.
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).
Tropical climates have an average temperature of 18 °C (64.4 °F) or higher every month of the year, with significant precipitation. [9] [11] Af = Tropical rainforest climate; average precipitation of at least 60 mm (2.4 in) in every month.
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]
Despite the popular image of the Amazon Rainforest as a hot and humid region, temperatures of more than 35 °C (95 °F) are unusual. The annual average temperature in the region is 22 to 26 °C (72 to 79 °F), with not much variation between the warmest and the coldest months.