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Tropical monsoon climate, occasionally also known as a tropical wet climate or tropical monsoon and trade-wind littoral climate in climate classification, is a relatively rare type of climate. Tropical monsoon climates have monthly mean temperatures above 18°C (64°F) in every month of the year and feature wet and dry seasons, as Tropical savanna climates do. Unlike tropical savanna climates however, a tropical monsoon climate's driest month sees less than 60 mm (2.36 in) of precipitation. Also a tropical monsoon climate tends to see less variance in temperatures during the course of the year than a tropical savanna climate. This climate has a driest month which nearly always occurs at or soon after the "winter" solstice for that side of the equator.
The Köppen Climate Classification subtype for this climate is "Am". (Tropical Monsoon Climate).
The average temperature for the year in Hanalei is 75.7°F (24.3°C). The warmest month, on average, is August with an average temperature of 79.5°F (26.4°C). The coolest month on average is February, with an average temperature of 71.6°F (22°C).
The highest recorded temperature in Hanalei is 95.0°F (35°C), which was recorded in September. The lowest recorded temperature in Hanalei is 88.0°F (31.1°C), which was recorded in December.
The average amount of precipitation for the year in Hanalei is 143.9" (3655.1 mm). The month with the most precipitation on average is April with 17.6" (447 mm) of precipitation. The month with the least precipitation on average is September with an average of 6.3" (160 mm). There are an average of 79.0 days of precipitation, with the most precipitation occurring in January with 7.0 days and the least precipitation occurring in February with 6.0 days.
In terms of liquid precipitation, there are an average of 52.3 days of rain, with the most rain occurring in January with 7.5 days of rain, and the least rain occurring in June with 1.7 days of rain.