A Mediterranean climate/ˌmɛdɪtəˈreɪniən/ or dry summer climate is characterized by rainy winters and dry summers, with less than 40 mm of precipitation for at least three summer months. While the climate receives its name from the
Mediterranean Basin, these are generally located on the western coasts of continents, between roughly 30 and 43 degrees north and south of the equator, typically between
oceanic climates towards the poles (where they tend to be wetter and cooler), and
arid climates towards the
equator (where they tend to be drier and hotter).
In essence, and due to the seasonal shift of the
subtropical high-pressure belts with the apparent movement of the Sun, a Mediterranean climate is an intermediate type between these other climates, with winters warmer and drier (and sunnier) than oceanic climates and summers imitating sunny weather in semi-arid and arid climates.
vegetation of Mediterranean climates are the
maquis in the Mediterranean Basin, the
chaparral in California, the
fynbos in South Africa, the
mallee in Australia, and the
matorral in Chile. Areas with this climate are where the so-called "Mediterranean trinity" has traditionally developed: wheat, vine and olive.
Köppen climate classification, "hot dry-summer" climates (classified as Csa) and "cool dry-summer" climates (classified as Csb) are often referred to as "Mediterranean". Under the Köppen climate system, the first letter indicates the climate group (in this case temperate climates). Temperate climates or "C" zones have an average temperature above 0 °C (32 °F) (or −3 °C (27 °F)), but below 18 °C (64 °F), in their coolest months. The second letter indicates the precipitation pattern ("s" represents dry summers). Köppen has defined a dry summer month as a month with less than 30 mm (1.2 in) of precipitation and with less than one-third that of the wettest winter month. Some, however, use a 40 mm (1.6 in) level. The third letter indicates the degree of summer heat: "a" represents an average temperature in the warmest month above 22 °C (72 °F), while "b" indicates the average temperature in the warmest month below 22 °C (72 °F).
Under the Köppen classification, dry-summer climates (Csa, Csb) usually occur on the western sides of continents. Csb zones in the Köppen system include areas normally not associated with Mediterranean climates but with
Oceanic climates, such as much of the
Pacific Northwest, much of southern
Chile, parts of west-central
Argentina, and parts of
New Zealand. Additional highland areas in the subtropics also meet Cs requirements, though they, too, are not normally associated with Mediterranean climates, as do a number of
oceanic islands such as
Juan Fernández Islands, the western part of the
Canary Islands, and the eastern part of the
Trewartha's modified Köppen climate classification, the two major requirements for a Cs climate are revised. Under Trewartha's system, at least eight months must have average temperatures of 10 °C (50 °F) or higher (
subtropical), and the average annual precipitation must not exceed 900 mm (35 in). Thus, under this system, many Csb zones in the Köppen system become Do (temperate oceanic), and the rare Csc zones become Eo (subpolar oceanic), with only the classic dry-summer to warm winter, low annual rainfall locations included in the Mediterranean type climate.
It [Chile] has six, months of winter, no more, and in them, except when there is a quarter moon, when it rains one or two days, all the other days have such beautiful suns...
During summer, regions of Mediterranean climate are strongly influenced by cold ocean currents which keep the weather in the region very dry, stable, and pleasant. Similar to
desert climates, in many Mediterranean climates there is a strong
diurnal character to daily temperatures in the warm summer months due to strong heating during the day from sunlight and rapid cooling at night.
In winter, Mediterranean climate zones are no longer influenced by the cold ocean currents and therefore warmer water settles near land and causes clouds to form and rainfall becomes much more likely. As a result, areas with this climate receive almost all of their precipitation during their winter and spring seasons, and may go anywhere from 3 to 6 months during the summer without having any significant
precipitation. In the lower latitudes, precipitation usually decreases in both the winter and summer because they are closer to the
Horse latitudes, thus bringing smaller amounts of rain. Toward the polar latitudes, total moisture usually increases; the Mediterranean climate in Southern Europe has more rain. The rainfall also tends to be more evenly distributed throughout the year in Southern Europe, while in the Eastern Mediterranean (the
Levant) and in
Southern California the summer is nearly or completely dry. In places where
evapotranspiration is higher, steppe climates tend to prevail, but still follow the weather pattern of the Mediterranean climate.
The majority of the regions with Mediterranean climates have relatively mild winters and very warm summers. However winter and summer temperatures can vary greatly between different regions with a Mediterranean climate. For instance, in the case of winters,
Los Angeles experience mild temperatures in the winter, with frost and snowfall almost unknown, whereas
Tashkent has colder winters with annual frosts and snowfall. Or to consider summer,
Athens experiences rather high temperatures in that season (48 °C (118 °F) has been measured in nearby
Eleusis). In contrast,
San Francisco has cool summers with daily highs around 21 °C (70 °F) due to the continuous
upwelling of cold subsurface waters along the coast.
Because most regions with a Mediterranean climate are near large bodies of water,
temperatures are generally moderate with a comparatively small range of temperatures between the winter low and summer high (although the daily range of temperature during the summer is large due to dry and clear conditions, except along the immediate coasts). Temperatures during winter only occasionally fall below the freezing point and
snow is generally seldom seen. In the summer, the temperatures range from mild to very hot, depending on distance from a large body of water, elevation, and latitude. Even in the warmest locations with a Mediterranean-type climate, however, temperatures usually do not reach the highest readings found in adjacent
desert regions because of cooling from water bodies, although strong winds from inland desert regions can sometimes boost summer temperatures, quickly increasing the risk of
As in every climatologic domain, the highland locations of the Mediterranean domain can present cooler temperatures in winter than the lowland areas, temperatures which can sometimes prohibit the growth of typical Mediterranean plants. Some Spanish authors opt to use the term "Continental Mediterranean climate" for some regions with lower temperature in winter than the coastal areas (direct translation from Clima Mediterráneo Continentalizado), but most climate classifications (including Köppen's Cs zones) show no distinction.
Additionally, the temperature and rainfall pattern for a Csa or even a Csb climate can exist as a microclimate in some high-altitude locations adjacent to a rare tropical As (
tropical savanna climate with dry summers, typically in a rainshadow region).
These have a favourable climate with mild wet winters and fairly warm, dry summers.
The Ionian Sea, view from the island
Mediterranean forests, woodlands, and scrubbiome is closely associated with Mediterranean climate zones, as are unique freshwater communities. Particularly distinctive of the climate are
sclerophyll shrublands, called
maquis in the Mediterranean Basin,
chaparral in California,
matorral in Chile,
fynbos in South Africa, and
kwongan shrublands in Australia. Aquatic communities in Mediterranean climate regions are adapted to a yearly cycle in which
abiotic (environmental) controls of stream populations and community structure dominate during floods,
biotic components (e.g. competition and predation) controls become increasingly important as the discharge declines, and environmental controls regain dominance as environmental conditions become very harsh (i.e. hot and dry); as a result, these communities are well suited to recover from
fires. Aquatic organisms in these regions show distinct long-term patterns in structure and function, and are also highly sensitive to the effects of climate change.
The native vegetation of Mediterranean climate lands must be adapted to survive long, hot summer droughts and prolonged wet periods in winter. Mediterranean vegetation examples include the following:
Much native vegetation in Mediterranean climate area valleys have been cleared for agriculture. In places such as the
Sacramento Valley and
Oxnard Plain in
California, draining marshes and estuaries combined with supplemental irrigation has led to a century of intensive agriculture. Much of the
Overberg in the southern Cape of
South Africa, once covered with
renosterveld, has likewise been largely converted to agriculture, mainly
wheat. In hillside and mountainous areas, away from
urban sprawl, ecosystems and habitats of native vegetation are more sustained.
This subtype of the Mediterranean climate (Csa) is the most common form of the Mediterranean climate, therefore it is also known as a “typical Mediterranean climate”. As stated earlier, regions with this form of a Mediterranean climate experience average monthly temperatures in excess of 22 °C (71.6 °F) during its warmest month and an average in the coldest month between 18 and −3 °C (64.4 and 26.6 °F) or, in some applications, between 18 and 0 °C (64.4 and 32.0 °F). Also, at least four months must average above 10 °C (50 °F). Regions with this form of the Mediterranean climate typically experience hot, sometimes very hot and dry summers and mild, wet winters. In a number of instances, summers here can closely resemble summers seen in
semi-arid climates. However, high temperatures during summers are generally not quite as high as those in arid or semiarid climates due to the presence of a large body of water. All areas with this subtype have wet winters. However, some areas with a hot Mediterranean subtype can actually experience very chilly winters, with occasional snowfall.
Occasionally also termed “Cool-summer Mediterranean climate”, this subtype of the Mediterranean climate (Csb) is the less common form of the Mediterranean climate. Cool ocean currents and upwelling are often the reason for this cooler type of Mediterranean climate. As stated earlier, regions with this subtype of the Mediterranean climate experience warm (but not hot) and dry summers, with no average monthly temperatures above 22 °C (72 °F) during its warmest month and an average in the coldest month between 18 and −3 °C (64 and 27 °F) or, in some applications, between 18 and 0 °C (64 and 32 °F). Also, at least four months must average above 10 °C (50 °F). Winters are rainy and can be mild to chilly. In a few instances, snow can fall on these areas. Precipitation occurs in the colder seasons, but there are a number of clear sunny days even during the wetter seasons.
Distribution of the relatively rare cold-summer Mediterranean climate (Köppen type Csc) in Washington, Oregon and California.
The cold-summer subtype of the Mediterranean climate (Csc) is rare and predominately found at scattered high-altitude locations along the west coasts of North and South America. This type is characterized by cool summers, with fewer than four months with a mean temperature at or above 10 °C (50 °F), as well as with mild winters, with no winter month having a mean temperature below 0 °C (32 °F) (or −3 °C [27 °F]), depending on the isotherm used). Regions with this climate are influenced by the dry-summer trend that extends considerably poleward along the west coast of the Americas, as well as the moderating influences of high altitude and relative proximity to the Pacific Ocean.
In North America, areas with Csc climate can be found in the
Sierra Nevada ranges in Washington, Oregon and California. These locations are found at high altitude nearby lower altitude regions characterized by a warm-summer Mediterranean climate (Csb) or hot-summer Mediterranean climate (Csa). A rare instance of this climate occurs in the tropics, on
Haleakalā Summit in Hawaii.
In South America, Csc regions can be found along the
Andes in Chile and Perú. The town of
Balmaceda is one of the few towns confirmed to have this climate.
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