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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 Negombo is 80.0°F (26.7°C). The warmest month, on average, is April with an average temperature of 82.0°F (27.8°C). The coolest month on average is December, with an average temperature of 78.0°F (25.6°C).
The highest recorded temperature in Negombo is 99.0°F (37.2°C), which was recorded in April. The lowest recorded temperature in Negombo is 59.0°F (15°C), which was recorded in January.
The average amount of precipitation for the year in Negombo is 92.3" (2344.4 mm). The month with the most precipitation on average is May with 14.6" (370.8 mm) of precipitation. The month with the least precipitation on average is February with an average of 2.7" (68.6 mm). There are an average of 138.0 days of precipitation, with the most precipitation occurring in October with 19.0 days and the least precipitation occurring in February with 4.0 days.
In terms of liquid precipitation, there are an average of 104.1 days of rain, with the most rain occurring in May with 13.2 days of rain, and the least rain occurring in February with 5.2 days of rain.