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This climate type is characterized by extremely variable temperature conditions, with annual means decreasing and annual ranges increasing poleward, and relatively little precipitation. This climate is typically located deep within the interiors of continents and is contiguous with the tropical desert climates of North and South America and of central Asia. This region type owes its origins to locations deep within continental interiors, far from the windward coasts and sources of moist, maritime air. Remoteness from sources of water vapor is enhanced in some regions by mountain barriers upwind.
The Köppen Climate Classification subtype for this climate is "Bsh". (Mid-Latitude Steppe and Desert Climate).
The average temperature for the year in Petrolina is 79.3°F (26.3°C). The warmest month, on average, is November with an average temperature of 82.8°F (28.2°C). The coolest month on average is July, with an average temperature of 75.4°F (24.1°C).
The highest recorded temperature in Petrolina is 111.4°F (44.1°C), which was recorded in January. The lowest recorded temperature in Petrolina is 54.3°F (12.4°C), which was recorded in June.
The average amount of precipitation for the year in Petrolina is 16.9" (429.3 mm). The month with the most precipitation on average is March with 4.0" (101.6 mm) of precipitation. The month with the least precipitation on average is July with an average of 0.1" (2.5 mm). In terms of liquid precipitation, there are an average of 14.4 days of rain, with the most rain occurring in December with 4.4 days of rain, and the least rain occurring in January with 0.0 days of rain.