Climate of Africa

The climate of Africa is a range of climates such as the equatorial climate, the tropical wet and dry climate, the tropical monsoon climate, the semi-arid climate (semi-desert and steppe), the desert climate (hyper-arid and arid), the humid subtropical climate, and the subtropical highland climate. Temperate climates are rare across the continent except at very high elevations and along the fringes. In fact, the climate of Africa is more variable by rainfall amount than by temperatures, which are consistently high. African deserts are the sunniest and the driest parts of the continent, owing to the prevailing presence of the subtropical ridge with subsiding, hot, dry air masses. Africa holds many heat-related records: the continent has the hottest extended region year-round, the areas with the hottest summer climate, the highest sunshine duration, and more.

Climate zones of Africa, showing the ecological break between the Sahara Desert (red), the hot semi-arid climate of the Sahel (orange) and the tropical climate of Central and Western Africa (blue). Southern Africa has a transition to subtropical and temperate climates (green and yellow), and more desert or semi-arid regions, centered on Namibia, Botswana, and South Africa.^[1]

A map of Africa showing the ecological break around the Sahara Desert

Owing to Africa's position across equatorial and subtropical latitudes in both the northern and southern hemisphere, several different climate types can be found within it. The continent mainly lies within the intertropical zone between the Tropic of Cancer and the Tropic of Capricorn, hence its interesting density of humidity. Precipitation intensity is always high, and it is a hot continent. Warm and hot climates prevail all over Africa, but mostly the northern part is marked by aridity and high temperatures. Only the northernmost and the southernmost fringes of the continent have a Mediterranean climate. The equator runs through the middle of Africa, as do the Tropic of Cancer and the Tropic of Capricorn, making Africa the most tropical continent.

Temperatures

See also: Subtropical ridge

 

Monthly mean and minimum outdoor and indoor temperatures throughout Africa

Globally, heating of the earth near the equator leads to large amounts of upward motion and convection along the monsoon trough or Intertropical Convergence Zone. The divergence over the near-equatorial trough leads to air rising and moving away from the equator aloft. As it moves towards the Mid-Latitudes, the air cools and sinks, which leads to subsidence near the 30th parallel of both hemispheres. This circulation is known as the Hadley cell and leads to the formation of the subtropical ridge.^[2] Many of the world's deserts are caused by these climatological high-pressure areas,^[3] including the Sahara Desert.

Temperatures are hottest within the Sahara regions of Algeria and Mali,^[4] and coolest across the south and at elevation within the topography across the eastern and northwest sections of the continent. The hottest average temperature on Earth is at Dallol, Ethiopia, which averages a temperature of 33.9 °C (93.0 °F) throughout the year.^[5] The hottest temperature recorded within Africa, which was also the world record, was 57.8 °C (136.0 °F) at 'Aziziya, Libya, on 13 September 1922. This was later proven to be false, being derived from an inaccurate reading of a thermometer. The world's hottest place is in fact Death Valley, in California.^[6][7][8] Apparent temperatures, combining the effect of the temperature and humidity, along the Red Sea coast of Eritrea and Gulf of Aden coast of Somalia range between 57 °C (135 °F) and 63 °C (145 °F) during the afternoon hours.^[4] The lowest temperature measured within Africa was −24 °C (−11 °F) at Ifrane, Morocco, on 11 February 1935.^[9] Nevertheless, the major part of Africa experiences extreme heat during much of the year, especially the deserts, semi-deserts, steppes and savannas. The African deserts are arguably the hottest places on Earth, especially the Sahara Desert and the Danakil Desert, located in the Horn of Africa.

Wind

Main article: African easterly jet

The mid-level African easterly jet stream north of the equator is considered to play a crucial role in the West African monsoon,^[10] and helps form the tropical waves which march across the tropical Atlantic and the eastern part of the Pacific during the warm season.^[11] The jet exhibits both barotropic and baroclinic instability, which produces synoptic-scale, westward-propagating disturbances in the jet known as African easterly waves, or tropical waves. A small number of mesoscale storm systems embedded in these waves develop into tropical cyclones after they move from west Africa into the tropical Atlantic, mainly during August and September. When the jet lies south of normal during the peak months of the Atlantic hurricane season, tropical cyclone formation is suppressed.^[12]

Low-level jets are fast winds which form close to the surface (within 1.5 km). They affect a number of climate processes across Africa. The Somali Low-level Jet,^[13] which forms of the coast of East Africa, contributes to the existence of the Somali Desert.^[14][15] Low-level jets of the Sahara are known to be important for raising dust off the dry desert surface. For example, the low-level jet over Chad,^[16] is the driver of dust emission from the Bodélé Depression, the largest source of atmospheric dust on the planet.^[17] Easterly low-level jets which form in river valleys across the East African Rift System supply millions of tonnes of water vapour originating from the Indian Ocean across East Africa and to the Congo rainforest.^[18] In doing so, they leave East Africa unusually dry for its latitude.^[19] Low-level southwesterlies emanating from the Gulf of Guinea are the key moisture source for the West African monsoon in northern hemisphere summer.^[20]

The Tropical Easterly Jet, which forms high up in the atmosphere, 15-17 km above the surface, is another important factor. Variations to the speed and position of this jet stream can affect rainfall in the Congo Basin and the Sahel.^[21]

Precipitation

 

Mean precipitation map

See also: Wet season

Great parts of North Africa and Southern Africa as well as the whole Horn of Africa mainly have a hot desert climate, or a hot semi-arid climate for the wetter locations. The Sahara Desert in North Africa is the largest hot desert in the world and is one of the hottest, driest and sunniest places on Earth. Located just south of the Sahara is a narrow semi-desert steppe (a semi-arid region) called the Sahel, while Africa's most southern areas contain both savanna plains, and its central portion, including the Congo Basin, contains very dense jungle (rainforest) regions. The western equatorial region is the wettest portion of the continent. Annually, the rain belt across the continent moves northward into Sub-Saharan Africa by August, then passes back southward into south-central Africa by March.^[22] Areas with a savannah climate in Sub-Saharan Africa, such as Ghana, Burkina Faso,^[23][24] Darfur,^[25] Eritrea,^[26] Ethiopia,^[27] and Botswana have a distinct rainy season.^[28] El Nino results in drier-than-normal conditions in Southern Africa from December to February, and wetter-than-normal conditions in equatorial East Africa over the same period.^[29]

In Madagascar, trade winds bring moisture up the eastern slopes of the island, which is deposited as rainfall, and bring drier downsloped winds to areas south and west, leaving the western sections of the island in a rain shadow. This leads to significantly more rainfall over northeast sections of Madagascar than its southwestern portions.^[30] Southern Africa receives most of its rainfall from summer convective storms, tropical lows, mesoscale convective systems. Extratropical cyclones moving through the Westerlies, can also bring significant winter rainfall. Once a decade, tropical cyclones lead to excessive rainfall across the region.^[31]

Snow and glaciers

 

Snow in the Atlas Mountains in Morocco

Snow is an almost annual occurrence on some of the mountains of South Africa, including those of the Cedarberg and around Ceres in the South-Western Cape, and on the Drakensberg in Natal and Lesotho. Tiffendell Resort, in the Drakensberg, is the only commercial ski resort in South Africa, and has "advanced snow-making capability" allowing skiing for three months of the year.^[32] The Mountain Club of South Africa (MCSA) and the Mountain and Ski Club (MSC)^[33] of the University of Cape Town both have equipped ski huts in the Hex River mountains. Skiing including snowboarding in the Cape is a hit-and-miss affair, both in terms of timing of snowfalls, and whether there is sufficient snow to cover the rocks.

Table Mountain gets a light dusting of snow on the Front Table and also at Devil's Peak every few years. Snowfalls on Table Mountain took place on 20 September 2013;^[34] 30 August 2013;^[35] 5 August 2011;^[36] and on 15 June 2010.^[37]

Snow is a rare occurrence in Johannesburg; it fell in May 1956, August 1962, June 1964, September 1981, August 2006, and on 27 June 2007,^[38] accumulating up to 10 centimetres (3.9 in) in the southern suburbs.

Additionally, snow regularly falls in the Atlas Mountains in the Maghreb, as well as the Mediterranean regions and Sinai peninsula of Egypt. Snowfall is also a regular occurrence at Mount Kenya and Mount Kilimanjaro in Tanzania.

There have been permanent glaciers on the Rwenzori Mountains, on the border of Uganda and the Democratic Republic of the Congo. However, by the 2010s, the glaciers were in retreat, and they are under threat of disappearing through rising temperatures.^[39]

Climate change

This section is an excerpt from Climate change in Africa.[edit]

 

Graph showing temperature change in Africa between 1901 and 2021, with red colour being warmer and blue being colder than average (the average temperature during 1971–2000 is taken as the reference point for these changes).

Climate change in Africa is an increasingly serious threat as Africa is among the most vulnerable continents to the effects of climate change.^[40][41][42] Some sources even classify Africa as "the most vulnerable continent on Earth".^[43][44] Climate change and climate variability will negatively impact agricultural production, food security, water security and ecosystem services.^[45] As a result, there will be severe consequences on lives and sustainable development in Africa.^[41]

Over the coming decades, warming from climate change is expected across almost all the Earth's surface, and global mean rainfall will increase.^[46] Currently, Africa is warming faster than the rest of the world on average. Large portions of the continent may become uninhabitable as a result of the rapid effects of climate change, which would have disastrous effects on human health, food security, and poverty.^[47][48][49] Regional effects on rainfall in the tropics are expected to be much more spatially variable. The direction of change at any one location is often less certain. Consistent with this, observed surface temperatures have generally increased over Africa since the late 19th century to the early 21st century by about 1 °C.^[50] In the Sahel, the increase has been as much as 3 °C for the minimum temperature at the end of the dry season.^[50] Observed precipitation trends indicate spatial and temporal discrepancies as expected.^[51][41] The observed changes in temperature and precipitation vary regionally.^[52][51]

For instance, Kenya has a high vulnerability to the impacts of climate change. The main climate hazards include droughts and floods, and rainfall will likely become more intense and less predictable. In addition, climate models anticipate temperatures rising by 0.5 to 2 °C.^[53] In the informal urban settlements of Nairobi the urban heat island effect adds to the problem as it creates even warmer ambient temperatures. This is due to home construction materials, lack of ventilation, sparse green space, and poor access to electrical power and other services.^[54]

The African Union has put forward 47 goals and corresponding actions in a 2014 draft report to combat and mitigate climate change in Africa.^[55] The Secretary General of the United Nations has also declared a need for close cooperation with the African Union to tackle climate change. The United Nations estimates that yearly funding of $1.3 trillion would be needed to achieve the Sustainable Development Goals in Africa. The International Monetary Fund estimates that $50 billion may be needed only to cover the expenses of climate change adaptation.^[56][57][58]

In chapter 9 of the IPCC Sixth Assessment Report, it is reported that although greenhouse gas emissions are among the lowest in Africa, anthropogenic climate change has severely threatened daily life. People experience extreme food insecurity, high mortality rates, major biodiversity loss, and more as a result of global warming. Additionally, because of reduced economic activity and growth and inequities in funding, the ability for adaptation to these conditions is also reduced.^[59]

Severe weather

 

Satellite image of Cyclone Kenneth in 2019 striking Mozambique

Tornadoes

Main article: List of Africa tornadoes and tornado outbreaks

Tornadoes can occur regularly in South Africa along the eastern coast with the Indian Ocean.^[60]

Tropical cyclones

Main articles: Tropical cyclones in Southern Africa, List of West Africa hurricanes, and List of Horn of Africa tropical cyclones

Powerful tropical cyclones regularly affect southeastern Africa. On average, 1.5 tropical cyclones strike Madagascar each year, which is the most affected area in Africa.^[61] In March 1927, a tropical cyclone struck eastern Madagascar, killing at least 500 people.^[62] In March 2004, Cyclone Gafilo hit northeastern Madagascar as one of the island's strongest ever cyclones, killing 363 people, leaving US$250 million in damage.^[63][64] In March 2019, Cyclone Idai hit central Mozambique and killed 1,302 people across Southern Africa, – affecting more than 3 million people. Total damages from Idai across Mozambique, Zimbabwe, Madagascar, and Malawi were estimated to be at least $2.2 billion (2019 USD).^[65][66] Roughly one month later, Cyclone Kenneth struck northern Mozambique as the country's strongest ever landfall.^[67] In 2020, Cyclone Freddy struck Mozambique in two different locations, producing widespread rainfall that killed 1,434 people along its path, mostly in Malawi.^[68][69]

Occasionally, cyclones in the Mediterranean can affect northern Africa, and which also have characteristics of a tropical cyclone. In September 2023, Storm Daniel moved ashore Libya and produced heavy rainfall, producing flash flooding after two dams failed. The storm killed at least 4,333 people in the country, becoming the deadliest storm to hit Africa in recorded history.^[70][71] In September 1969, a cyclone in the Mediterranean Sea killed nearly 600 people in Tunisia and Libya.^[72] Cyclones from the Indian Ocean can strike the Horn of Africa. In November 2013, a deep depression struck Somalia and killed 162 people while also causing extensive livestock damage.^[73][74][75] The temperature contrast between the hot Sahara Desert in northern Africa and the cooler Gulf of Guinea to the south produces the African easterly jet, which generates tropical waves, or an elongated area of low pressure. These waves are often the formation source of Atlantic and Pacific hurricanes.^[76]

See also

• Climate of South Africa
• Earth rainfall climatology

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External links

• Interactive Africa Koppen-Geiger Climate Classification Map