Geography of Nigeria
With the Intertropical Convergence Zone (ITCZ) swinging northward over West Africa from the Southern Hemisphere in April, heavy showers coming from pre-monsoonal convective clouds mainly in the form of squall lines also known as the north easterlies formed mainly as a result of the interactions of the two dominant airmasses in Nigeria known as the Maritime tropical (south westerlies) and the Continental tropical (north easterlies), begins in central Nigeria while the Monsoons from the south atlantic ocean arrives in central Nigeria in July bringing with it high humidity, heavy cloud cover and heavy rainfall which can be daily occurrence lasting till September when the monsoons gradually begin retreating southward to the southern part of Nigeria. Rainfall totals in central Nigeria varies from 1,100 mm (43.3 in) in the lowlands of the river Niger Benue trough to over 2,000 mm (78.7 in) along the south western escarpment of the Jos Plateau.
Nigeria
As of 2015[update], Nigeria is the world's 20th largest economy, worth more than $500 billion and $1 trillion in terms of nominal GDP and purchasing power parity respectively. It overtook South Africa to become Africa's largest economy in 2014. Also, the debt-to-GDP ratio is only 11 percent, which is 8 percent below the 2012 ratio. Nigeria is considered to be an emerging market by the World Bank; It has been identified as a regional power on the African continent, a middle power in international affairs, and has also been identified as an emerging global power. Nigeria is a member of the MINT group of countries, which are widely seen as the globe's next "BRIC-like" economies. It is also listed among the "Next Eleven" economies set to become among the biggest in the world. Nigeria is a founding member of the Commonwealth of Nations, the African Union, OPEC, and the United Nations amongst other international organisations.
Geography of Nigeria
Nigeria, like the rest of West Africa and other tropical lands, has only two seasons. These are the dry season and the rainy season. The dry season is accompanied by a dust laden airmass from the Sahara Desert, locally known as Harmattan, or by its main name, The Tropical Continental (CT) airmass, while the rainy season is heavily influenced by an airmass originating from the south atlantic ocean, locally known as the south west wind, or by its main name, The Tropical Maritime (MT) airmass. These two major wind systems in Nigeria are known as the trade winds.
South Africa
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded on the south by 2,798 kilometres (1,739 mi) of coastline of Southern Africa stretching along the South Atlantic and Indian Oceans; on the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; and on the east and northeast by Mozambique and Swaziland; and surrounds the kingdom of Lesotho. South Africa is the largest country in Southern Africa and the 25th - largest country in the world by land area and, with close to 56 million people, is the world's 24th-most populous nation. It is the southernmost country on the mainland of the Old World or the Eastern Hemisphere. About 80 percent of South Africans are of Sub-Saharan African ancestry, divided among a variety of ethnic groups speaking different African languages, nine of which have official status. The remaining population consists of Africa's largest communities of African (black), European (white), Asian (Indian), and multiracial (coloured) ancestry.
Moab Khotsong mine
The Moab Khotsong mine is a large mine located in the northern part of South Africa in North West some 180 kilometers southwest of Johannesburg, South Africa. Moab Khotsong represents one of the largest uranium reserves in South Africa having estimated reserves of 57.2 million tonnes of ore grading 0.058% uranium.
Vojislav Ilić
His poetry exemplifies a classic example of modern Serbian language and features the standard "Decadent" motifs of the epoch: cruel nature (e.g. cold wind blowing across empty fields), and times of Elagabalus.
The Wind Blows (short story)
The Wind Blows is a 1920 short story by Katherine Mansfield. It was first published in the "Athenaeum" on 27 August 1920, and later reprinted in "Bliss and Other Stories".
Malawi
Malawi (, or ; or [maláwi]), officially the Republic of Malawi, is a landlocked country in southeast Africa that was formerly known as Nyasaland. It is bordered by Zambia to the northwest, Tanzania to the northeast, and Mozambique on the east, south and west. Malawi spans over and has an estimated population of (as of July ). Lake Malawi takes up about a third of Malawi's area. Its capital is Lilongwe, which is also Malawi's largest city; the second largest is Blantyre, the third largest is Mzuzu and the fourth largest is its old capital Zomba. The name Malawi comes from the Maravi, an old name of the Nyanja people that inhabit the area. The country is also nicknamed ""The Warm Heart of Africa"" because of the friendliness of the people.
Tamboti mine
The Tamboti mine is a large open pit mine located in the north-western part of South Africa in North West. Tamboti represents one of the largest platinum reserves in South Africa having estimated reserves of 27.1 million oz of platinum. The mine produces around 500,000 oz of platinum/year.
Marula mine
The Marula mine is a large open pit mine located in the north-western part of South Africa in North West. Marula represents one of the largest platinum reserves in South Africa having estimated reserves of 10.3 million oz of platinum. The mine produces around 100,000 oz of platinum per year.
Cape Doctor
Although the wind blows over a wide area of the Western Cape Province, it is notorious especially in and around the Cape Peninsula, where it can be unpleasantly strong and irritating. Capetonians also call it "the South-Easter".
Driefontein mine
The Driefontein mine is a large mine located in the northern part of South Africa in Gauteng. Driefontein represents one of the largest uranium reserves in South Africa having estimated reserves of 238 million tonnes of ore grading 0.0053% uranium.
Wrigley Field
In April and May the wind often comes off Lake Michigan (less than a mile to the east), which means a northeast wind ``blowing in ''to knock down potential home runs and turn them into outs. In the summer, however, or on any warm and breezy day, the wind often comes from the south and the southwest, which means the wind is`` blowing out'' and has the potential to turn normally harmless fly balls into home runs. A third variety is the cross-wind, which typically runs from the left field corner to the right field corner and causes all sorts of havoc. Depending on the direction of the wind, Wrigley can either be one of the friendliest parks in the major leagues for pitchers or among the worst. This makes Wrigley one of the most unpredictable parks in the Major Leagues.
Libya
Libya (; ; ), officially the State of Libya, is a country in the Maghreb region in North Africa, bordered by the Mediterranean Sea to the north, Egypt to the east, Sudan to the southeast, Chad to the south, Niger to the southwest, Algeria to the west, and Tunisia to the northwest. The sovereign state is made of three historical regions: Tripolitania, Fezzan and Cyrenaica. With an area of almost , Libya is the fourth largest country in Africa, and is the 16th largest country in the world. Libya has the 10th-largest proven oil reserves of any country in the world. The largest city and capital, Tripoli, is located in western Libya and contains over one million of Libya's six million people. The second-largest city is Benghazi, which is located in eastern Libya.
Wind direction
Wind direction is reported by the direction from which it originates. For example, a northerly wind blows from the north to the south. Wind direction is usually reported in cardinal directions or in azimuth degrees. Wind direction is measured in degrees clockwise from due north. Consequently, a wind blowing from the north has a wind direction of 0 °; a wind blowing from the east has a wind direction of 90 °; a wind blowing from the south has a wind direction of 180 °; and a wind blowing from the west has a wind direction of 270 °. In general, wind directions are measured in units from 0 ° to 360 °, but can alternatively be expressed from - 180 ° to 180 °.
Tatanka Wind Farm
The 180 MW Tatanka Wind Farm, is located in Dickey County and McIntosh County, North Dakota, and McPherson County, South Dakota. It is the largest wind farm in North and South Dakota and generates enough renewable energy to power more than 60,000 U.S. homes.
Bokkoms
Bokkoms (or Bokkems) is whole, salted and dried mullet (more specifically the Southern mullet, "Liza richardsonii", a type of fish commonly known in the Western Cape of South Africa as "harders"), and is a well-known delicacy from the West Coast region of South Africa. This salted fish is dried in the sun and wind and is eaten after peeling off the skin. In some cases it is also smoked. It is sometimes referred to as "fish biltong".
South Africa
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by 2,798 kilometres (1,739 mi) of coastline of Southern Africa stretching along the South Atlantic and Indian Oceans; to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; and to the east and northeast by Mozambique and Swaziland (Eswatini); and it surrounds the kingdom of Lesotho. South Africa is the largest country in Southern Africa and the 25th - largest country in the world by land area and, with close to 56 million people, is the world's 24th-most populous nation. It is the southernmost country on the mainland of the Old World or the Eastern Hemisphere. About 80 percent of South Africans are of Sub-Saharan African ancestry, divided among a variety of ethnic groups speaking different African languages, nine of which have official status. The remaining population consists of Africa's largest communities of European (white), Asian (Indian), and multiracial (Coloured) ancestry.
Namibia
Uprisings and demands by African leaders led the UN to assume direct responsibility over the territory. It recognised the South West Africa People's Organisation (SWAPO) as the official representative of the Namibian people in 1973. Namibia, however, remained under South African administration during this time as South-West Africa. Following internal violence, South Africa installed an interim administration in Namibia in 1985. Namibia obtained full independence from South Africa in 1990, with the exception of Walvis Bay and the Penguin Islands, which remained under South African control until 1994.
Mali
Mali (; ), officially the Republic of Mali (), is a landlocked country in West Africa. Mali is the eighth-largest country in Africa, with an area of just over . The population of Mali is /1e6 round 1 million. 67% of its population was estimated to be under the age of 25 in 2017. Its capital is Bamako. The sovereign state of Mali consists of eight regions and its borders on the north reach deep into the middle of the Sahara Desert, while the country's southern part, where the majority of inhabitants live, features the Niger and Senegal rivers. The country's economy centers on agriculture and mining. Some of Mali's prominent natural resources include gold, being the third largest producer of gold in the African continent, and salt.

Question: When does the south west wind blow in the largest economy in Africa?
Answer: April