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The wet season (sometimes called the rainy season or monsoon season) is the time of year when most of a region's average annual rainfall occurs. [1] Generally, the season lasts at least one month. [2] The term green season is also sometimes used as a euphemism by tourist authorities. [3]
The rainy season occurs from September to February and it is a major source of energy for the Hadley circulation during boreal winter. It is associated with the development of the Siberian High and the movement of the heating maxima from the Northern Hemisphere to the Southern Hemisphere.
There is a pronounced rainy season from April to November across the commonwealth, encompassing the annual hurricane season. Due to the Commonwealth's topography, rainfall varies greatly across the archipelago. Pico del Este averages 171.09 inches (4,346 mm) of rainfall yearly while Magueyes Island averages only 29.32 inches (745 mm) a year.
The length and severity of the dry season diminish inland (southward); at the latitude of the Amazon River—which flows eastward, just south of the equatorial line—the climate is Af. East from the Andes, between the dry, arid Caribbean and the ever-wet Amazon are the Orinoco River's Llanos or savannas, from where this climate takes its name.
The Köppen climate classification is the most widely used climate classification system. [2] It defines a tropical climate as a region where the mean temperature of the coldest month is greater than or equal to 18 °C (64 °F) and does not fit into the criteria for B-group climates, classifying them as an A-group (tropical climate group). [3]
After a dry start to winter, California's rainy season is finally well under way. December downpours sent water racing through streets in coastal Ventura County and the city of Santa Barbara.
Wet season storm in Darwin. In northern Australia, the predominant wind is from the east or southeast in most occasions, which usually bring dry conditions. [4] Though during monsoon periods (between November to April), the winds change to northwesterly, where atmospheric pressure decreases over an area extending to Java, Sumatra, Timor Sea and eastward to Papua New Guinea.
Tropical monsoon climates have monthly mean temperatures above 18 °C (64 °F) in every month of the year and a dry season. [ 1 ] : 200–1 The tropical monsoon climate is the intermediate climate between the wet Af (or tropical rainforest climate ) and the drier Aw (or tropical savanna climate ).