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Tropical savanna climates have monthly mean temperature above 18°C (64°F) in every month of the year and typically a pronounced dry season, with the driest month having precipitation less than 60mm (2.36 in) of precipitation. In essence, a tropical savanna climate tends to either see less rainfall than a tropical monsoon climate or have more pronounced dry seasons than a tropical monsoon climate. Tropical savanna climates are most commonly found in Africa, Asia and South America. The climate is also prevalent in sections of Central America, northern Australia and North America, specifically in sections of Mexico and the state of Florida in the United States.
The Köppen Climate Classification subtype for this climate is "Aw". (Tropical Savanna Climate).
The average temperature for the year in San Marcos is 81.0°F (27.2°C). The warmest month, on average, is October with an average temperature of 82.0°F (27.8°C). The coolest month on average is May, with an average temperature of 80.0°F (26.7°C).
The highest recorded temperature in San Marcos is 101.0°F (38.3°C), which was recorded in November. The lowest recorded temperature in San Marcos is 63.0°F (17.2°C), which was recorded in May.
The average amount of precipitation for the year in San Marcos is 45.5" (1155.7 mm). The month with the most precipitation on average is September with 8.2" (208.3 mm) of precipitation. The month with the least precipitation on average is February with an average of 0.0" (0 mm). In terms of liquid precipitation, there are an average of 71.1 days of rain, with the most rain occurring in July with 10.4 days of rain, and the least rain occurring in February with 0.0 days of rain.