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A tropical rainforest climate, also known as an equatorial climate, is a tropical climate usually (but not always) found along the equator. Tropical rainforest climate is a type of tropical climate in which there is no dry season - all months have mean precipitation values of at least 60 mm (2.36 in). Tropical rainforest climates have no pronounced summer or winter; it is typically hot and wet throughout the year and rainfall is both heavy and frequent. One day in an equatorial climate can be very similar to the next, while the change in temperature between day and night may be larger than the average change in temperature between "summer" and "winter".
The Köppen Climate Classification subtype for this climate is "Af". (Tropical Rainforest Climate).
The average temperature for the year in Ratnapura is 81.4°F (27.4°C). The warmest month, on average, is April with an average temperature of 83.2°F (28.4°C). The coolest month on average is September, with an average temperature of 80.6°F (27°C).
The average amount of precipitation for the year in Ratnapura is 147.6" (3749 mm). The month with the most precipitation on average is May with 18.7" (475 mm) of precipitation. The month with the least precipitation on average is January with an average of 4.4" (111.8 mm). In terms of liquid precipitation, there are an average of 205.0 days of rain, with the most rain occurring in June with 21.0 days of rain, and the least rain occurring in January with 9.0 days of rain.