The savanna climate is hot and wet in summer, when the Sun is overhead; temperatures average about 25°C (77°) and the rainfall is 25cm to 125cm (10–50in). In winter, the tropical high-pressure system controls the climate, and so the conditions are warm but very dry. Temperatures are 15°C to 25°C (59°–77°F), and rainfall totals are less than 250mm (10in). In such a climate, grass grows very well in summer – up to 2m (6ft) in height – but it will shrivel in winter. Trees do not grow well, although baobabs and bottle tress survive by storing water inside their swollen trunks.
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