The Tropical Zone
As its name implies, this climatic zone is found in the tropics. The temperatures of these zones are consistent all year round. In fact, the only distinguishing characteristic of the different seasons is the amount of rainfall that they bring. In areas of rainforests, such as in Brazil, the average rainfall is at least 60 millimetres (or 2.4 inches) per annum. To qualify as a Tropical Zone, an area must have a mean temperature of over 18 degrees Celsius all year round.