RAINFALL |
Brazil's most intense
rainfall is found around the mouth of the Amazon River near the city of
Belém, and also in the vast upper regions of Amazonia where more
than 2,000 millimetres (78 inches) of rain falls every year. Another important
region of heavy rainfall is along the edge of the great escarpment in
the state of São Paulo. Most of Brazil, however, has moderate rainfall
of between 1,000 to 1,500 millimetres (39 to 59 inches) a year, with most
of the rain falling in the summer, between December and April. The winters
tend to be dry. |
The driest part of the
country is the northeast, the so-called "polygon of drought",
encompassing 10 percent of the country's territory. In this region rainfall
is undependable and the evaporation rate is very high, making it difficult
to raise crops. Along the coastline, south from Recife, the mountains
trigger rainfall from the Trade Winds. In some places behind the mountains,
such as the region south of Salvador, the hinterland is dry because the
rain is dumped on the mountains leaving very little for the area behind. |