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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 Heredia is 66.0°F (18.9°C). The warmest month, on average, is May with an average temperature of 69.0°F (20.6°C). The coolest month on average is January, with an average temperature of 66.0°F (18.9°C).
The average amount of precipitation for the year in Heredia is 83.1" (2110.7 mm). The month with the most precipitation on average is October with 15.3" (388.6 mm) of precipitation. The month with the least precipitation on average is January with an average of 0.3" (7.6 mm). In terms of liquid precipitation, there are an average of 182.6 days of rain, with the most rain occurring in May with 15.7 days of rain, and the least rain occurring in January with 14.6 days of rain.