Wet season

rainy seasonmonsoon seasonwetrainy seasonsrain seasonrainyseasonal rainfallflood seasonmonsoonrain
The wet season (sometimes called the rainy season) is the time of year when most of a region's average annual rainfall occurs.wikipedia
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Rain

rainfallrainwaterrainstorm
The wet season (sometimes called the rainy season) is the time of year when most of a region's average annual rainfall occurs.
The movement of the monsoon trough, or intertropical convergence zone, brings rainy seasons to savannah climes.

Köppen climate classification

ClimateKöppenKöppen-Geiger climate classification system
Under the Köppen climate classification, for tropical climates, a wet season month is defined as a month where average precipitation is 60 mm or more.
Indeed, in tropical South America and Central America, the 'rainy season' (and the 'high water season') is called invierno or inverno, though it could occur in the Northern Hemisphere summer; likewise, the 'dry season' (and 'low water season') is called verano or verão, and can occur in the Northern Hemisphere winter).

Monsoon

southwest monsoonmonsoonsnortheast monsoon
In contrast to areas with savanna climates and monsoon regimes, Mediterranean climates have wet winters and dry summers.
Usually, the term monsoon is used to refer to the rainy phase of a seasonally changing pattern, although technically there is also a dry phase.

Tropical climate

tropicaltropical climatestropical highland
Under the Köppen climate classification, for tropical climates, a wet season month is defined as a month where average precipitation is 60 mm or more.
Indeed, in tropical South America and Central America, the 'rainy season' (and the 'high water season') is called Invierno or inverno, though it could occur in the Northern Hemisphere summer; likewise, the 'dry season' (and 'low water season') is called Verano or verão, and can occur in the Northern Hemisphere winter).

Seasonal tropical forest

monsoon foresttropical seasonal forestmonsoon forests
Dry and rainy months are characteristic of tropical seasonal forests: in contrast to tropical rainforests, which do not have dry or wet seasons, since their rainfall is equally distributed throughout the year.
This tropical forest is classified under the Walter system as (ii) tropical climate with high overall rainfall (typically in the 1000–2500 mm range; 39–98 inches) concentrated in the summer wet season and cooler “winter” dry season: representing a range of habitats influenced by monsoon (Am) or tropical wet savannah (Aw) climates (as in the Köppen climate classification).

Tropics

tropicaltropictropical zone
Areas with wet seasons are dispersed across portions of the tropics and subtropics.
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.

Monsoon trough

monsoon depressionmonsoonmonsoonal trough
Some areas with pronounced rainy seasons will see a break in rainfall mid-season, when the intertropical convergence zone or monsoon trough moves to higher latitudes in the middle of the warm season.
Right along its axis, heavy rains can be found which usher in the peak of a location's respective rainy season.

Precipitation

rainfallhydrometeorannual precipitation
When the wet season occurs during a warm season, or summer, precipitation falls mainly during the late afternoon and early evening.
The movement of the monsoon trough, or intertropical convergence zone, brings rainy seasons to savannah climes.

Ghana

GhanaianRepublic of GhanaGHA
Areas with a savanna climate in Sub-Saharan Africa, such as Ghana, Burkina Faso, Darfur, Eritrea, Ethiopia, and Botswana have a distinct rainy season.
The climate of Ghana is tropical and there are two main seasons: the wet season and the dry season.

Darfur

DafurWestern SudaneseDar Fur
Areas with a savanna climate in Sub-Saharan Africa, such as Ghana, Burkina Faso, Darfur, Eritrea, Ethiopia, and Botswana have a distinct rainy season.
A second feature are the wadis, which range from seasonal watercourses that flood only occasionally during the wet season to large wadis that flood for most of the rains and flow from western Darfur hundreds of kilometres west to Lake Chad.

Louisiana

LAState of LouisianaLouisiana, USA
Also subtropical areas like Florida, South and Southeast Texas, and southern Louisiana have a rainy season.
Rain is frequent throughout the year, although from April to September is slightly wetter than the rest of the year, which is the state's wet season.

South Texas

SouthSouthern Texassouthern
Also subtropical areas like Florida, South and Southeast Texas, and southern Louisiana have a rainy season.
The region itself sees a short wet season from March to May and another one from late August to October, and a dry season elsewhere in the year.

Indonesia

Republic of IndonesiaIndonesianIndonesian Republic
Monsoon regions include the Indian subcontinent, Southeast Asia (including Indonesia and Philippines), northern sections of Australia's North, Polynesia, Central America, western and southern Mexico, the Desert Southwest of the United States, southern Guyana, portions of northeast Brazil.
Indonesia has two seasons—a wet season and a dry season—with no extremes of summer or winter.

Central America

CentralCentral AmericanCentral American Isthmus
Monsoon regions include the Indian subcontinent, Southeast Asia (including Indonesia and Philippines), northern sections of Australia's North, Polynesia, Central America, western and southern Mexico, the Desert Southwest of the United States, southern Guyana, portions of northeast Brazil.
Temperatures in Central America are highest just prior to the summer wet season, and are lowest during the winter dry season, when trade winds contribute to a cooler climate.

Ghaggar-Hakra River

GhaggarGhaggar RiverGhaggar-Hakra
The Ghaggar-Hakra River, which only flows during India's monsoon season, can flood and severely damage local crops.
The Ghaggar-Hakra River is an intermittent, endorheic river in India and Pakistan that flows only during the monsoon season.

Southeast Texas

Southeastsoutheastern partSouth East Texas
Also subtropical areas like Florida, South and Southeast Texas, and southern Louisiana have a rainy season.
On average, the region receives more rain than other parts of the state, and it experiences a wet season and dry season like the tropics.

East Asian rainy season

rainy seasonmeiyuplum rains
The wet season ends during the summer when the subtropical ridge becomes strong enough to push this front north of the region.

Euphemism

euphemisticeuphemisticallyeuphemism treadmill
The term 'green season' is also sometimes used as a euphemism by tourist authorities.

Subtropics

subtropicalsub-tropicalsubtropical climate
Areas with wet seasons are dispersed across portions of the tropics and subtropics.

Savanna

savannahsavannassavannahs
In contrast to areas with savanna climates and monsoon regimes, Mediterranean climates have wet winters and dry summers. Areas with a savanna climate in Sub-Saharan Africa, such as Ghana, Burkina Faso, Darfur, Eritrea, Ethiopia, and Botswana have a distinct rainy season.

Mediterranean climate

warm-summer Mediterranean climateMediterraneanCsb
In contrast to areas with savanna climates and monsoon regimes, Mediterranean climates have wet winters and dry summers.

Tropical rainforest

tropical rain foresttropical rainforeststropical rain forests
Dry and rainy months are characteristic of tropical seasonal forests: in contrast to tropical rainforests, which do not have dry or wet seasons, since their rainfall is equally distributed throughout the year.

Summer

summer seasonaustral summersummers
When the wet season occurs during a warm season, or summer, precipitation falls mainly during the late afternoon and early evening.

Air pollution

air qualityair pollutantemissions
In the wet season, air quality improves, fresh water quality improves, and vegetation grows substantially, leading to crop yields late in the season.

Soil

soilsdirtsoil moisture
Soil nutrients diminish and erosion increases.