An equatorial climate characterizes much of northern Brazil. There is no real dry season, but there are some variations in the period of the year when most rain falls.[148] Temperatures average 25 °C (77 °F),[150] with more significant temperature variation between night and day than between seasons.[149]
Over central Brazil rainfall is more seasonal, characteristic of a savanna climate.[149] This region is as extensive as the Amazon basin but has a very different climate as it lies farther south at a higher altitude.[148] In the interior northeast, seasonal rainfall is even more extreme. The semiarid climatic region generally receives less than 800 millimetres (31.5 in) of rain,[151] most of which generally falls in a period of three to five months of the year[152] and occasionally less than this, creating long periods of drought.[149] Brazil's 1877–78 Grande Seca (Great Drought), the most severe ever recorded in Brazil,[153] caused approximately half a million deaths.[154] The one from 1915 was devastating too.[155]
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