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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 amount of precipitation for the year in Umatac is 102.9" (2613.7 mm). The month with the most precipitation on average is October with 16.9" (429.3 mm) of precipitation. The month with the least precipitation on average is April with an average of 2.2" (55.9 mm). There are an average of 230.0 days of precipitation, with the most precipitation occurring in November with 26.0 days and the least precipitation occurring in February with 12.0 days.