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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 San Juan is 80.2°F (26.8°C). The warmest month, on average, is August with an average temperature of 82.8°F (28.2°C). The coolest month on average is January, with an average temperature of 76.9°F (24.9°C).
The highest recorded temperature in San Juan is 98.0°F (36.7°C), which was recorded in October. The lowest recorded temperature in San Juan is 46.0°F (7.8°C), which was recorded in October.
The average amount of precipitation for the year in San Juan is 55.0" (1397 mm). The month with the most precipitation on average is November with 6.1" (154.9 mm) of precipitation. The month with the least precipitation on average is February with an average of 2.2" (55.9 mm). There are an average of 198.0 days of precipitation, with the most precipitation occurring in July with 19.0 days and the least precipitation occurring in March with 12.0 days.
In terms of liquid precipitation, there are an average of 196.0 days of rain, with the most rain occurring in July with 19.0 days of rain, and the least rain occurring in March with 12.0 days of rain.