Seasons and climate
A graph showing the zonally averaged monthly precipitation. The tropics receive more precipitation than higher latitudes. The precipitation maximum, which follows the solar equator through the year, is under the rising branch of the Hadley circulation; the sub-tropical minima are under the descending branch and cause the desert areas.
"Tropical" is sometimes used in a general sense for a
tropical climate to mean warm to hot and moist year-round, often with the sense of lush vegetation.
Many tropical areas have a dry and wet season. The
wet season, rainy season or green season is the time of year, ranging from one or more months, when most of the average annual
rainfall in a region falls.
 Areas with wet seasons are disseminated across portions of the tropics and
 Under the
Köppen climate classification, for
tropical climates, a wet-season month is defined as a month where average precipitation is 60 millimetres (2.4 in) or more.
Tropical rainforests technically do not have dry or wet seasons, since their rainfall is equally distributed through the year.
 Some areas with pronounced rainy seasons see a break in rainfall during mid-season when the
intertropical convergence zone or
monsoon trough moves poleward of their location during the middle of the warm season;
 typical vegetation in these areas ranges from moist
seasonal tropical forests to
When the wet season occurs during the warm season, or
precipitation falls mainly during the late afternoon and early evening hours. The wet season is a time when
air quality improves, freshwater quality improves and vegetation grows significantly, leading to crop yields late in the season. Floods cause rivers to overflow their banks, and some animals to retreat to higher ground.
Soil nutrients diminish and erosion increases. The incidence of
malaria increases in areas where the rainy season coincides with high temperatures. Animals have adaptation and survival strategies for the wetter regime. Unfortunately, the previous dry season leads to food shortages into the wet season, as the crops have yet to mature.
However, regions within the tropics may well not have a tropical climate. Under the
Köppen climate classification, much of the area within the geographical tropics is classed not as "tropical" but as "dry" (
semi-arid), including the
Sahara Desert, the
Atacama Desert and
Australian Outback. Also, there are
alpine tundra and snow-capped peaks, including
Mount Kilimanjaro, and the
Andes as far south as the northernmost parts of