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  • Humid subtropical climate

    Humid subtropical climate

    • Durban, South Africa
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      Average max. and min. temperatures in °C
      Precipitation totals in mm
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      Average max. and min. temperatures in °C
      Precipitation totals in mm
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      Tokyo, Japan
      Climate chart ()
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      Average max. and min. temperatures in °C
      Precipitation totals in mm
      Source: Japan Meteorological Agency
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      Average max. and min. temperatures in °C
      Precipitation totals in mm
      Source: Japan Meteorological Agency
      Kutaisi, Georgia
      Climate chart ()
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      Average max. and min. temperatures in °C
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      Average max. and min. temperatures in °C
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      Source:
      Houston, United States
      Climate chart ()
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      Average max. and min. temperatures in °C
      Precipitation totals in mm
      Source:

      A humid subtropical climate is a zone of climate characterised by hot, usually humid summers and mild to cool winters. It normally lies on the southeast side of all continents, generally between latitudes 25° and 40°. It tends to be located at coastal or near coastal locations. However, in some cases it extends inland, most notably in China and the United States.

      Under the Köppen climate classification, Cfa and Cwa climates are sometimes described as humid subtropical climates. This climate features mean temperatures in the coldest month between 0 °C (32 °F) and 18 °C (64 °F) and mean temperatures in the warmest month 22 °C (72 °F) or higher. However, while some climatologists opted to describe this climate type as a "humid subtropical climate" Köppen himself never used this term. The humid subtropical climate classification was officially created under the Trewartha Climate classification.

      The Trewartha system was a 1966 update of the Köppen climate classification, and sought to redefine middle latitude climates into smaller zones (the original Köppen system grouped all middle latitude climates into a single zone). Under the Trewartha climate classification, climates are termed humid subtropical when they have monthly mean air temperatures higher than 10 °C (50 °F) for eight or more months a year and at least one month with mean temperature below 18 °C (64.4 °F).

      Rainfall often shows a summer peak, especially where monsoons are well developed, as in Southeast Asia. However, other areas tend to have more uniform rainfall. Most summer rainfall occurs during thunderstorms that build up due to the intense surface heating and strong subtropical sun angle. Weak tropical lows that move in from adjacent warm tropical oceans, as well as infrequent tropical storms often contribute to high sun (summer) seasonal rainfall peaks. Winter rainfall is often associated with large storms in the westerlies that have fronts that reach down into subtropical latitudes. However, many subtropical climates such as southeast Asia or Florida have very dry winters, with frequent brush fires and water shortages.



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    • Humid subtropical climate

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