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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 Charlotte Amalie is 81.4°F (27.4°C). The warmest month, on average, is August with an average temperature of 84.1°F (28.9°C). The coolest month on average is January, with an average temperature of 78.6°F (25.9°C).
The highest recorded temperature in Charlotte Amalie is 99.0°F (37.2°C), which was recorded in June. The lowest recorded temperature in Charlotte Amalie is 52.0°F (11.1°C), which was recorded in November.
The average amount of precipitation for the year in Charlotte Amalie is 39.7" (1008.4 mm). The month with the most precipitation on average is October with 6.1" (154.9 mm) of precipitation. The month with the least precipitation on average is March with an average of 1.4" (35.6 mm). There are an average of 171.0 days of precipitation, with the most precipitation occurring in October with 18.0 days and the least precipitation occurring in March with 10.0 days.
In terms of liquid precipitation, there are an average of 51.0 days of rain, with the most rain occurring in November with 6.0 days of rain, and the least rain occurring in March with 3.0 days of rain.