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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 Parnaiba is 83.0°F (28.3°C). The warmest month, on average, is October with an average temperature of 86.0°F (30°C). The coolest month on average is March, with an average temperature of 82.0°F (27.8°C).
The average amount of precipitation for the year in Parnaiba is 34.8" (883.9 mm). The month with the most precipitation on average is March with 10.0" (254 mm) of precipitation. The month with the least precipitation on average is August with an average of 0.1" (2.5 mm). In terms of liquid precipitation, there are an average of 53.7 days of rain, with the most rain occurring in March with 13.5 days of rain, and the least rain occurring in August with 0.4 days of rain.