Wet season

rainy seasonmonsoon seasonwetrainy seasonsrain seasonrainyseasonal rainfallflood seasoninviernomonsoon
The monsoon season is the time of year when most of a region's average annual rainfall occurs.wikipedia
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Rain

rainfallrainstormtorrential rain
The monsoon 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

ClimateKöppenCfb
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.

Subtropics

subtropicalsub-tropicalsubtropical climate
Areas with wet seasons are dispersed across portions of the tropics and subtropics.
Within savanna regimes in the subtropics, a wet season is seen annually during the summer, which is when most of the yearly rainfall 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

🇬🇭GhanaianGHA
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

Darfur, SudanWestern SudaneseDarfur Province
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.

Indonesia

🇮🇩IndonesianRepublic of Indonesia
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.

Pacific Ocean

PacificWestern PacificSouth Pacific
In the western United States, during the cold season from September–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.
In the tropical western Pacific, the monsoon and the related wet season during the summer months contrast with dry winds in the winter which blow over the ocean from the Asian landmass.

Central America

CentralCentral AmericanCentral-
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

Ghaggar riverGhaggarGhaggar-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.

East Asian rainy season

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

Euphemism

euphemisticeuphemisticallyeuphemisms
The term "green season" is also sometimes used as a euphemism by tourist authorities.

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
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

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

Air pollution

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

Soil

dirtsoilssoil moisture
Soil nutrients diminish and erosion increases.

Malaria

cerebral malariamalarial fevermalarial
The incidence of malaria increases in areas where the rainy season coincides with high temperatures, particularly in tropical areas.

Intertropical Convergence Zone

near-equatorial troughITCZIntertropical Convergence Zone (ITCZ)
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.