Köppen climate classification
One of the most widely used climate classification systems.- Köppen climate classification
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[[File:Koppen World Map Cwa Cfa.png|thumb|right|upright=1.8|Warm temperate with hot summer climate zones of the world according to a modified Köppen climate classification that uses a threshold of 0 °C for the coldest month.
Under the Köppen climate classification, Cfa and Cwa climates are either described as humid subtropical climates or warm temperate climates.
[[File:BS climate.png|thumb|upright=1.75|Regions with semi-arid climates
A more precise definition is given by the Köppen climate classification, which treats steppe climates (BSk and BSh) as intermediates between desert climates (BW) and humid climates (A, C, D) in ecological characteristics and agricultural potential.
Continental climates often have a significant annual variation in temperature (hot summers and cold winters).
Most such areas fit Köppen climate classifications of Dfa, Dwa having hot summers (mean temperature of the warmest month above 22 °C; "w" indicating very dry winters characteristic especially of China) or Dfb or Dwb with warm summers (mean temperature below 22 °C).
Climate characterised by long, cold (often very cold) winters, and short, warm to cool summers.
These climates represent Köppen climate classification Dfc, Dwc, Dsc, Dfd, Dwd and Dsd.
Russian-German geographer, meteorologist, climatologist and botanist.
His most notable contribution to science was the development of the Köppen climate classification system, which, with some modifications, is still commonly used.
[[File:Koppen World Map Cfb Cfc Cwb Cwc.png|upright=1.8|thumb|right|World map showing oceanic climate zones
An oceanic climate, also known as a maritime climate or marine climate, is the Köppen classification of climate typical of west coasts in higher middle latitudes of continents, generally featuring mild summers (relative to their latitude) and cool but not freezing winters, with a relatively narrow annual temperature range and few extremes of temperature.
Koppen-Geiger Map D present.svg
Using the Köppen climate classification, a climate is classified as humid continental when the temperature of the coldest month is below 0 °C or -3 °C and there must be at least four months whose mean temperatures are at or above 10 °C.
Time of year when most of a region's average annual rainfall occurs.
Under the Köppen climate classification, for tropical climates, a wet season month is defined as a month where average precipitation is 60 mm or more.
Yearly period of low rainfall, especially in the tropics.
Under the Köppen climate classification, for tropical climates, a dry season month is defined as a month when average precipitation is below 60 mm.
[[Image:Köppen World Map ET and EF (Polar).svg|thumb|upright=1.8|Areas of polar climate according to the [[Köppen climate classification]].
See Köppen climate classification for more information.