An area of tropical monsoon climate (occasionally known as a sub-equatorial, tropical wet climate or a tropical monsoon and trade-wind littoral climate) is a

tropical climate Tropical climate is the first of the five major climate groups in the Köppen climate classification identified with the letter A. Tropical climates are defined by a monthly average temperature of or higher in the coolest month, featuring hot te ...

subtype that corresponds to the

Köppen climate classification The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...

category ''Am''. Tropical monsoon climates have monthly mean temperatures above in every month of the year and a dry season. The tropical monsoon climate is the intermediate climate between the wet Af (or

tropical rainforest climate A tropical rainforest climate or equatorial climate is a tropical climate sub-type usually found within 10 to 15 degrees latitude of the equator. There are some other areas at higher latitudes, such as the coast of southeast Florida, United States ...

) and the drier Aw (or

tropical savanna climate Tropical savanna climate or tropical wet and dry climate is a tropical climate sub-type that corresponds to the Köppen climate classification categories ''Aw'' (for a dry "winter") and ''As'' (for a dry "summer"). The driest month has less than ...

). A tropical monsoon climate's driest month has on average less than 60 mm, but more than

100-\left(\frac\right)

. This is in direct contrast to a

, whose driest month has less than 60 mm of precipitation and also less than

100-\left(\frac\right)

of average monthly precipitation. In essence, a tropical monsoon climate tends to either have more rainfall than a tropical savanna climate or have less pronounced dry seasons. A tropical monsoon climate tends to vary less in temperature during a year than does a tropical savanna climate. This climate has the driest month, which nearly always occurs at or soon after the winter solstice.

Versions

There are generally two versions of a tropical monsoon climate: * Less pronounced dry seasons. Regions with this variation of the tropical monsoon climate typically see copious amounts of rain during the wet season(s), usually in the form of frequent thunderstorms. Unlike most tropical savanna climates, a sizeable amount of precipitation also falls during the dry season(s), but not quite enough for a

tropical rainforest Tropical rainforests are dense and warm rainforests with high rainfall typically found between 10° north and south of the Equator. They are a subset of the tropical forest biome that occurs roughly within the 28° latitudes (in the torrid zo ...

classification. In essence, this version of the tropical monsoon climate generally has less pronounced dry seasons than tropical savanna climates. * Extraordinarily rainy wet seasons and pronounced dry seasons. This variation features pronounced dry seasons similar in length and character to dry seasons observed in tropical savanna climates. This is followed by a sustained period (or sustained periods) of extraordinary rainfall. In some instances, up to (and sometimes in excess of) 1,000 mm of precipitation is observed per month for two or more consecutive months. Tropical savanna climates generally do not see this level of sustained rainfall.

Area

Tropical monsoon are most commonly found in

Africa Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...

(

West West is one of the four cardinal directions or points of the compass. It is the opposite direction from east and is the direction in which the Sun sets on the Earth. Etymology The word "west" is a Germanic word passed into some Romance langu ...

and

Central Africa Central Africa (French language, French: ''Afrique centrale''; Spanish language, Spanish: ''África central''; Portuguese language, Portuguese: ''África Central'') is a subregion of the African continent comprising various countries accordin ...

Asia Asia ( , ) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometres, about 30% of Earth's total land area and 8% of Earth's total surface area. The continent, which ...

(

South South is one of the cardinal directions or compass points. The direction is the opposite of north and is perpendicular to both west and east. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Proto-Germanic ''*sunþa ...

and

Southeast Asia Southeast Asia is the geographical United Nations geoscheme for Asia#South-eastern Asia, southeastern region of Asia, consisting of the regions that are situated south of China, east of the Indian subcontinent, and northwest of the Mainland Au ...

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

and

Central America Central America is a subregion of North America. Its political boundaries are defined as bordering Mexico to the north, Colombia to the southeast, the Caribbean to the east, and the Pacific Ocean to the southwest. Central America is usually ...

. This climate also occurs in sections of the

Caribbean The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

, and northern

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

Factors

The major controlling factor over a tropical monsoon climate is its relationship to the

monsoon A monsoon () is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in Atmosphere of Earth, atmospheric circulation and precipitation associated with annu ...

circulation. The monsoon is a seasonal change in wind direction. In Asia, during the summer (or high-sun season) there is an onshore flow of air (air moving from ocean toward land). In the “winter” (or low-sun season) an offshore air flow (air moving from land toward water) is prevalent. The change in direction is due to the difference in the way water and land heat. Changing pressure patterns that affect the seasonality of precipitation also occur in Africa, though it generally differs from the way it operates in Asia. During the high-sun season, the

Intertropical convergence zone The Intertropical Convergence Zone (ITCZ , or ICZ), known by sailors as the doldrums or the calms because of its monotonous windless weather, is the area where the northeast and the southeast trade winds converge. It encircles Earth near the t ...

(ITCZ) induces rain. During the low-sun season, the subtropical high creates dry conditions. The monsoon climates of Africa, and the Americas for that matter, are typically located along trade wind coasts.

Countries and cities

Asia *

Chittagong Chittagong ( ), officially Chattogram, (, ) (, or ) is the second-largest city in Bangladesh. Home to the Port of Chittagong, it is the busiest port in Bangladesh and the Bay of Bengal. The city is also the business capital of Bangladesh. It ...

, Bangladesh *

Sylhet Sylhet (; ) is a Metropolis, metropolitan city in the north eastern region of Bangladesh. It serves as the administrative center for both the Sylhet District and the Sylhet Division. The city is situated on the banks of the Surma River and, as o ...

, Bangladesh * Sihanoukville, Cambodia *

Qionghai Qionghai, also called Keng Hai, is a County-level city, county-level city in Hainan, China. It is located in the east of Hainan Island. Kachek city was the capital of Keng Hai. Kachek city was 2nd largest city in Hainan island. Previous counties ...

, China * Wanning, China *

Kochi Kochi ( , ), List of renamed Indian cities and states#Kerala, formerly known as Cochin ( ), is a major port city along the Malabar Coast of India bordering the Laccadive Sea. It is part of the Ernakulam district, district of Ernakulam in the ...

Kerala Kerala ( , ) is a States and union territories of India, state on the Malabar Coast of India. It was formed on 1 November 1956, following the passage of the States Reorganisation Act, by combining Malayalam-speaking regions of the erstwhile ...

, India *

Mangalore Mangaluru (), formerly called Mangalore ( ), is a major industrial port city in the Indian state of Karnataka and on the west coast of India. It is located between the Laccadive Sea and the Western Ghats about west of Bengaluru, the st ...

Karnataka Karnataka ( ) is a States and union territories of India, state in the southwestern region of India. It was Unification of Karnataka, formed as Mysore State on 1 November 1956, with the passage of the States Reorganisation Act, 1956, States Re ...

, India *

Thiruvananthapuram Thiruvananthapuram ( ), also known as Trivandrum, is the Capital city, capital city of the Indian state of Kerala. As of 2011, the Thiruvananthapuram Municipal Corporation had a population of 957,730 over an area of 214.86 sq. km, making it the ...

, India *

Bandung Bandung is the capital city of the West Java province of Indonesia. Located on the island of Java, the city is the List of Indonesian cities by population, fourth-most populous city and fourth largest city in Indonesia after Jakarta, Surabay ...

, Indonesia *

Jakarta Jakarta (; , Betawi language, Betawi: ''Jakartè''), officially the Special Capital Region of Jakarta (; ''DKI Jakarta'') and formerly known as Batavia, Dutch East Indies, Batavia until 1949, is the capital and largest city of Indonesia and ...

, Indonesia *

Makassar Makassar ( ), formerly Ujung Pandang ( ), is the capital of the Indonesian Provinces of Indonesia, province of South Sulawesi. It is the largest city in the region of Eastern Indonesia and the country's fifth-largest urban center after Jakarta, ...

, Indonesia *

Chichijima is the largest and most populous islands of Japan, island in the Japanese archipelago of Bonin Islands, Bonin or Ogasawara Islands. Chichijima is about north of Iwo Jima. in size, the island is home to about 2,120 people (2021). Connected to ...

, Japan *

Alor Setar Alor Setar ( Kedah Malay: ) is the state capital of Kedah, Malaysia. It is the second-largest city in the state after Sungai Petani and one of the most-important cities on the west coast of Peninsular Malaysia. It is home to the third-tallest ...

Kedah Kedah (), also known by its honorific Darul Aman (Islam), Aman (دار الأمان; Arabic for 'The Safe Abode') and historically as Queda, is a States and federal territories of Malaysia, state of Malaysia, located in the northwestern part of ...

, Malaysia *

Langkawi Langkawi, officially known as Langkawi, the Jewel of Kedah (), is a duty-free island and an archipelago of 99 islands (plus five small islands visible only at low tide in the Strait of Malacca) located some 30 km off the coast of northwe ...

, Malaysia *

Malé Malé is the capital and most populous city of the Maldives. With a population of 211,908 in 2022 within its administrative area and coterminous geographical area of , Malé is one of the most densely populated cities in the world. The city i ...

, Maldives *

Yangon Yangon, formerly romanized as Rangoon, is the capital of the Yangon Region and the largest city of Myanmar. Yangon was the List of capitals of Myanmar, capital of Myanmar until 2005 and served as such until 2006, when the State Peace and Dev ...

, Myanmar * Calamba, Philippines *

Manila Manila, officially the City of Manila, is the Capital of the Philippines, capital and second-most populous city of the Philippines after Quezon City, with a population of 1,846,513 people in 2020. Located on the eastern shore of Manila Bay on ...

, Philippines *

Quezon City Quezon City (, ; ), also known as the City of Quezon and Q.C. (read and pronounced in Filipino language, Filipino as Kyusi), is the richest and List of cities in the Philippines, most populous city in the Philippines. According to the 2020 c ...

, Philippines *

Batticaloa Batticaloa (, ''Maṭṭakkaḷappu'', ; , ''Maḍakalapuwa'', ) is a major city in the Eastern Province, Sri Lanka, and its former capital. It is the administrative capital of the Batticaloa District. The city is the seat of the Eastern Univers ...

, Sri Lanka *

Kaohsiung Kaohsiung, officially Kaohsiung City, is a special municipality located in southern Taiwan. It ranges from the coastal urban center to the rural Yushan Range with an area of . Kaohsiung City has a population of approximately 2.73 million p ...

, Taiwan * Pingtung, Taiwan * Taitung, Taiwan *

Hat Yai Hat Yai (, , also Haad Yai or Had Yai) is a city in southern Thailand near the Malaysian border and the List of municipalities in Thailand#Largest cities by urban population, fifth-largest city in Thailand with a population of 191,696 (2024) in ...

, Thailand * Narathiwat, Thailand * Pattani, Thailand * Cà Mau, Vietnam *

Da Nang Da Nang or DanangSee also Danang Dragons (, ) is the fifth-largest city in Vietnam by municipal population. It lies on the coast of the Western Pacific Ocean of Vietnam at the mouth of the Hàn River, and is one of Vietnam's most important p ...

, Vietnam Oceania *

Cairns Cairns (; ) is a city in the Cairns Region, Queensland, Australia, on the tropical north east coast of Far North Queensland. In the , Cairns had a population of 153,181 people. The city was founded in 1876 and named after William Cairns, Sir W ...

Queensland Queensland ( , commonly abbreviated as Qld) is a States and territories of Australia, state in northeastern Australia, and is the second-largest and third-most populous state in Australia. It is bordered by the Northern Territory, South Austr ...

, Australia *

Christmas Island Christmas Island, officially the Territory of Christmas Island, is an States and territories of Australia#External territories, Australian external territory in the Indian Ocean comprising the island of the same name. It is about south o ...

, Australia *

Saipan Saipan () is the largest island and capital of the Northern Mariana Islands, an unincorporated Territories of the United States, territory of the United States in the western Pacific Ocean. According to 2020 estimates by the United States Cens ...

, Northern Mariana Islands Africa *

Douala Douala is the largest city in Cameroon and its economic capital. It is also the capital of Cameroon's Littoral Region (Cameroon), Littoral Region. It was home to Central Africa's largest port, now being replaced by Kribi port. It has the country ...

, Cameroon * Bata, Equatorial Guinea *

Conakry Conakry ( , ; ; ; ) is the Capital city, capital and largest city of Guinea. A port city, it serves as the economic, financial and cultural centre of Guinea. Its population as of the 2014 Guinea census was 1,660,973. The current population of C ...

, Guinea *

Monrovia Monrovia () is the administrative capital city, capital and largest city of Liberia. Founded in 1822, it is located on Cape Mesurado on the Atlantic Ocean, Atlantic coast and as of the 2022 census had 1,761,032 residents, home to 33.5% of Liber ...

, Liberia *

Port Harcourt Port Harcourt (Pidgin: ''Po-ta-kot or Pi-ta-kwa)'' is the capital and largest city of Rivers State in Nigeria. It is the fifth most populous city in Nigeria after Lagos, Kano, Ibadan and Benin. It lies along the Bonny River and is locate ...

, Nigeria *

Freetown Freetown () is the Capital city, capital and largest city of Sierra Leone. It is a major port city on the Atlantic Ocean and is located in the Western Area of the country. Freetown is Sierra Leone's major urban, economic, financial, cultural, e ...

, Sierra Leone The Americas *

Recife Recife ( , ) is the Federative units of Brazil, state capital of Pernambuco, Brazil, on the northeastern Atlantic Ocean, Atlantic coast of South America. It is the largest urban area within both the North Region, Brazil, North and the Northeast R ...

Pernambuco Pernambuco ( , , ) is a States of Brazil, state of Brazil located in the Northeast Region, Brazil, Northeast region of the country. With an estimated population of 9.5 million people as of 2024, it is the List of Brazilian states by population, ...

, Brazil *

Macapá Macapá () is a city in Brazil with a population of 512,902 (2020 estimate), and is the capital of Amapá state in the country's North Region, Brazil, North Region, located on the northern channel of the Amazon Delta near its mouth on the Atlant ...

Amapá Amapá (; ) is one of the 26 federative units of Brazil, states of Brazil. It is in the North Region, Brazil, North Region of Brazil. It is Federative units of Brazil#List, the second-least populous state and the eighteenth-largest state by area ...

, Brazil *

Barrancabermeja Barrancabermeja () is a municipality and city in Colombia, located on the shore of the Magdalena River, in the western part of the department of Santander. It is home to the largest oil refinery in the country, under direct management of ECOP ...

, Colombia *

Villavicencio Villavicencio () is a city and municipality in Colombia. The capital of Meta Department, it was founded on April 6, 1840. The municipality had a population of 531,275 in 2018. The city is located at 4°08'N, 73°40'W, 75 km (about 45 ...

, Colombia *

Roseau Roseau (Dominican Creole French, Dominican Creole: ''Wozo'') is the capital and largest city of Dominica, with a population of 14,725 as of 2011. It is a small and compact urban settlement, in the Saint George Parish, Dominica, Saint George Pa ...

, Dominica *

Santo Domingo Santo Domingo, formerly known as Santo Domingo de Guzmán, is the capital and largest city of the Dominican Republic and the List of metropolitan areas in the Caribbean, largest metropolitan area in the Caribbean by population. the Distrito Na ...

, Dominican Republic *

Cayenne Cayenne (; ; ) is the Prefectures in France, prefecture and capital city of French Guiana, an overseas region and Overseas department, department of France located in South America. The city stands on a former island at the mouth of the Caye ...

, French Guiana (bordering on ''Af'') *

Coatzacoalcos Coatzacoalcos (; formerly known as Puerto México; ; Zapotec: ; Popoluca: ''Puertu'') is a major port city in the southern part of the Mexican state of Veracruz, mostly on the western side of the Coatzacoalcos River estuary, on the Bay of Ca ...

, Mexico * Villahermosa, Mexico *

Managua Managua () is the capital city, capital and largest city of Nicaragua, and one of the List of largest cities in Central America, largest cities in Central America. Located on the shores of Lake Managua, the city had an estimated population of 1, ...

, Nicaragua *

Panama City Panama City, also known as Panama, is the capital and largest city of Panama. It has a total population of 1,086,990, with over 2,100,000 in its metropolitan area. The city is located at the Pacific Ocean, Pacific entrance of the Panama Canal, i ...

, Panama *

Pucallpa Pucallpa (, ; Shipibo language, Shipibo: ''May Ushin'') is a city in eastern Peru located on the banks of the Ucayali River, a major tributary of the Amazon River. It is the capital of the Ucayali region, the Coronel Portillo Province and the C ...

, Peru *

San Juan, Puerto Rico San Juan ( , ; Spanish for "Saint John the Baptist, John") is the capital city and most populous Municipalities of Puerto Rico, municipality in the Commonwealth (U.S. insular area), Commonwealth of Puerto Rico, an unincorporated territory of the ...

Miami Miami is a East Coast of the United States, coastal city in the U.S. state of Florida and the county seat of Miami-Dade County, Florida, Miami-Dade County in South Florida. It is the core of the Miami metropolitan area, which, with a populat ...

Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...

, United States *

Basseterre Basseterre (; Saint Kitts Creole: ''Basterre'') is the Capital (political), capital and largest city of Saint Kitts and Nevis with an estimated population of 14,000 in 2018. Geographically, the Basseterre port is located at , on the south-wester ...

, Saint Kitts and Nevis * Nassau, The Bahamas (bordering on ''Aw'') *

Port of Spain Port of Spain ( ; Trinidadian and Tobagonian English, Trinidadian English: ''Port ah Spain'' ) is the capital and chief port of Trinidad and Tobago. With a municipal population of 49,867 (2017), an urban population of 81,142 and a transient dail ...

, Trinidad and Tobago * Guanare, Venezuela * Mérida, Venezuela * Puerto Ayacucho, Venezuela

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References

{{Authority control Climate, Monsoon Köppen climate types