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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 highest recorded temperature in Johnston Island is 100.0°F (37.8°C), which was recorded in May. The lowest recorded temperature in Johnston Island is 62.0°F (16.7°C), which was recorded in November.
The average amount of precipitation for the year in Johnston Island is 26.4" (670.6 mm). The month with the most precipitation on average is November with 4.0" (101.6 mm) of precipitation. The month with the least precipitation on average is June with an average of 0.9" (22.9 mm). There are an average of 158.0 days of precipitation, with the most precipitation occurring in October with 16.0 days and the least precipitation occurring in February with 10.0 days.
In terms of liquid precipitation, there are an average of 144.0 days of rain, with the most rain occurring in April with 14.0 days of rain, and the least rain occurring in February with 10.0 days of rain.