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Mediterranean climate, major climate type of the Köppen classification characterized by hot, dry summers and cool, wet winters and located between about 30° and 45° latitude north and south of the Equator and on the western sides of the continents. In the Köppen-Geiger-Pohl system, it is divided into the Csa and Csb subtypes.
Poleward extension and expansion of the subtropical anticyclone over the oceans bring subsiding air to the region in summer, with clear skies and high temperatures. When the anticyclone moves Equator-ward in winter, it is replaced by traveling, frontal cyclones with their attendant precipitation. Annual temperature ranges are generally smaller than those found in marine west coast climates, since locations on the western sides of continents are not well positioned to receive the coldest polar air, which develops over land rather than over the ocean. Mediterranean climates also tend to be drier than humid subtropical ones, with precipitation totals ranging from 35 to 90 cm (14 to 35 inches); the lowest amounts occur in interior regions adjacent to the semiarid steppe climates.
The subtropical Mediterranean climate characterizes the coastlands of southern Europe, being modified inland (for example,...
Some coastal locations (such as southern California in the western United States) exhibit relatively cool summer conditions and frequent fogs where cold offshore currents prevail. Only in Europe, where the latitude for this climate type fortuitously corresponds to an ocean basin (that of the Mediterranean Sea, from which this climate derives its name), does this climate type extend eastward away from the coast for any significant distance.
See more: How Many Centimeters Is 65 Inches To Centimeters, Convert 65 Inches To Centimeters
|1In the formulas above, r is average annual precipitation total (mm), and t is average annual temperature (°C). All other temperatures are monthly means (°C), and all other precipitation amounts are mean monthly totals (mm).|
|2Any climate that satisfies the criteria for designation as a B type is classified as such, irrespective of its other characteristics.|
|3The summer half of the year is defined as the months April–September for the Northern Hemisphere and October–March for the Southern Hemisphere.|
|4Most modern climate schemes consider the role of altitude. The highland zone has been taken from G.T. Trewartha, An Introduction to Climate, 4th ed. (1968).|
|Data Sources: Adapted from Howard J. Critchfield, General Climatology, 4th ed. (1983), and M.C. Peel, B.L. Finlayson, and T.A. McMahon, "Updated World Map of the Köppen-Geiger Climate Classification," Hydrology and Earth System Sciences, 11:1633–44 (2007).|
|A||temperature of coolest month 18 °C or higher|
|f||precipitation in driest month at least 60 mm|
|m||precipitation in driest month less than 60 mm but equal to or greater than 100 – (r/25)1|
|w||precipitation in driest month less than 60 mm and less than 100 – (r/25)|
|B2||70% or more of annual precipitation falls in the summer half of the year and r less than 20t + 280, or 70% or more of annual precipitation falls in the winter half of the year and r less than 20t, or neither half of the year has 70% or more of annual precipitation and r less than 20t + 1403|
|W||r is less than one-half of the upper limit for classification as a B type (see above)|
|S||r is less than the upper limit for classification as a B type but is more than one-half of that amount|
|h||t equal to or greater than 18 °C|
|k||t less than 18 °C|
|C||temperature of warmest month greater than or equal to 10 °C, and temperature of coldest month less than 18 °C but greater than –3 °C|
|s||precipitation in driest month of summer half of the year is less than 30 mm and less than one-third of the wettest month of the winter half|
|w||precipitation in driest month of the winter half of the year less than one-tenth of the amount in the wettest month of the summer half|
|f||precipitation more evenly distributed throughout year; criteria for neither s nor w satisfied|
|a||temperature of warmest month 22 °C or above|
|b||temperature of each of four warmest months 10 °C or above but warmest month less than 22 °C|
|c||temperature of one to three months 10 °C or above but warmest month less than 22 °C|
|D||temperature of warmest month greater than or equal to 10 °C, and temperature of coldest month –3 °C or lower|
|s||same as for type C|
|w||same as for type C|
|f||same as for type C|
|a||same as for type C|
|b||same as for type C|
|c||same as for type C|
|d||temperature of coldest month less than –38 °C (d designation then used instead of a, b, or c)|
|E||temperature of warmest month less than 10 °C|
|T||temperature of warmest month greater than 0 °C but less than 10 °C|
|F||temperature of warmest month 0 °C or below|
|H4||temperature and precipitation characteristics highly dependent on traits of adjacent zones and overall elevation—highland climates may occur at any latitude|
The Editors of Encyclopaedia civicpride-kusatsu.netThis article was most recently revised and updated by Adam Augustyn, Managing Editor, Reference Content.