The Cerrado (Brazilian Savanna) biome is the second larger in Brazil. The dominant climate is sub-humid hot tropical with two well defined, dry and rainy, seasons. Precipitation varies between 600 and 2,200 mm, for areas boarding the Caatinga (semi-arid) and Amazon biomes, respectively. Average annual temperatures vary from 22^o to 27^o C, according to altitude and susceptibility to cold air fronts.