Rainy season

The wet season, monsoon season or rainy season is the time of year when most of a region’s average annual rainfalloccurs. It usually lasts one or more months. The term “green season” is also sometimes used as aeuphemlsm by tourist authorities. Areas with wet seasons are dispersed across portions of the tropics andsubtropics. under the K¶ppen climate classification, fo In contrast to areas with savannaclimates and monsoon reglmes,medlterranean climates have wet winters and dry summers.
Tropical rainforests technically do not have dry or wet seasons, since their ainfall is equally distributed throughout the year. Some areas with pronounced rainy seasons will see a break in rainfall mld-season, when the Intertroplcal convergence zone or monsoon trough moves poleward of their location during the middle of the warm season. When the wet season occurs during a warm season, or summer, precipitation falls mainly during the late afternoon and early evening hours.
The wet season is a time when air qualityimproves, freshwater quality improves, and vegetation grows substantially, 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.

Character of rainfall: In areas where the heavy rainfall is associated with a wind shift, the wet season becomes known as the monsoon. [7] Since rainfall during the wet season is predominantly due to daytime heating which leads to diurnal thunderstorm activity ithin a pre-existing moist airmass, rainfall is mainly focused during the late afternoon and early evening hours within savannah and monsoon regimes.
This also leads to much of the total rainfall each day falling during the initial minutes of the downpour,[6] before the storms mature into their stratiform stage. [8] While most locations have only one wet season, areas of the tropics can experience two wet seasons as the monsoon trough, or Intertropical Convergence Zone, can pass over locations in the tropics twice per year. Since rain forests have equitable rainfall throughout the year. hey do not technically have a wet seasom The situation Is different for locations within the Mediterranean climate regime.
In the western United States, during the cold season from September through May, extratropical cyclones from the Pacific ocean move Inland Into the region due to a southward migration of the Jet stream during the cold season. This shift in the Jet stream brings much of the annual precipitation to the and also brings the potential for heavy rain and strong low pressure systems. [10] The peninsula of Italy experiences very similar weather to the western United States in this regard. Areas affected Areas with a savanna climate In Sub-Saharan Africa, such as Ghana, Burkina [1 3] 5] and Botswana have a distinct rainy season. 1 7] Also within the savannah climate regime, Florida and East Texas have a rainy Monsoon regions include southeast Asla(lnclualng Inaonesla ana nortnern sectlons 0T Australla’s Nortn, [21] Polynesia,[22] Central America,[23] western and southernMexico,[24] the Desert Southwest of the United States, southernGuyana, portions of northeast Brazil. Northern Guyana experiences two wet seasons: one in late spring and the other in early winter. 25] In western Africa, there are two rainy seasons across southern sections with only one across the north. 27] Within the Mediterranean climate regime, the west coast of the United States and theMediterranean coastline of Italy, Greece,[28] and Turkey experience a wet season in the winter months. [29] Similarly, the wet season in the Negev desert of Israel extends from October through May. [30] At the boundary between the Mediterranean and monsoon climates lies the Sonoran desert, which receives the two rainy seasons associated with each climate regime. [31] The wet season is known by many different local names hroughout the world. For example, the wet season period of the year in Mexico is known as storm season.
Effects In tropical areas, when the monsoon arrives daytime high temperatures drop and overnight low temperatures increase. [32] During the wet season, a combination of heavy rainfall and in some areas, such as Hong Kong, a wind more off the ocean, significantly improve air quality. [33] In Brazil, the wet season is correlated to weaker trade winds off the ocean. [26] The pH level of water becomes more balanced due to the charging of local aquifers during the wet season.