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The subtropics are the geographical zone of the Earth immediately north and south of the tropical zone, which is bounded by the Tropic of Cancermarker and the Tropic of Capricornmarker, at latitudes 23.5°N and 23.5°S. The term "subtropical" describes the climatic region found adjacent to the tropics, usually between 20 and 40 degrees of latitude in both hemispheres.

Definitions

According to climatologist Glenn G. Trewartha, a subtropical region should have at least eight months with a mean temperature of or above. His revision of Köppen climate classification assigns to such areas the letter C, while others zones encompassed in the original Köppen group C class would be considered part of group D.

Americanmarker climatologist John F. Griffiths in his book Applied climatology described the subtropical zone as having a coldest month of between and and assigning to this group the letter B, while the original B group of Köppen taxonomy would be spread over the various temperature-based groups.

German climatologists Carl Troll and Karl-Heinz Paffen defined warmgemäßigte Zonen ("Warm temperate zones") plain and hilly lands having an average temperature of the coldest month between and in Northern Hemispheremarker and between and in Southern Hemispheremarker, excluding oceanic and continental climates.

Characteristics

In subtropical climates the winters are relatively warm, but not as hot as the summer season. These climates rarely—if ever—see frost or snow, and plants such as palm, citrus and many broadleaf evergreens flourish, in contrast to the hardier deciduous and coniferous trees which dominate midlatitude climates. As one moves toward the tropical side the slight winter cool season disappears altogether, while at the polar threshold of the subtropics the winters become much cooler.

Rainfall patterns vary widely throughout the subtropics including hot deserts, savannas, monsoon forests, humid forests and the warmer parts of the Mediterranean climate zone. Subtropical regions include most of California and southern Europe (Mediterranean or dry-summer subtropical climate), the low deserts of the Southwest USA (hot arid type), the Gulf Coast and most of Florida (humid subtropical climate), northern India (monsoon), southeast Chinamarker (humid), the middle part of South America (varied), much of Australia (varied) and coastal South Africa. Even the Isles of Scillymarker meet both requirements— average in the coldest month and eight months with the average above . Plymouthmarker in Devonmarker just meets the John F. Griffiths' requirement for a subtropical climate — average min and max in the coldest month.

Subtropical areas

Examples of subtropical cities and areas around the world include (see map above for more details):
In Africa


In The Americas


In Eurasia


In Oceania


Subtropical flora

Image:Liveoak,savannah.png|Savannah, Georgiamarker: Live oak with spanish moss. This is a typical scene in the subtropical region of the eastern and southern USAmarker as far west as Houston, TX.Image:Parque Tingui Curitiba Brasil.jpg|Curitibamarker: Live oak with araucarias. This is a typical scene in the subtropical region of the southern Brazil.

Charts of Selected Cities with Subtropical Climates













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