Köppen climate classification
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The Köppen climate classification is a system for dividing the world's climates on the basis of temperature and precipitation patterns throughout the year. The system works on the principle that the boundaries between climate types correspond to the boundaries of plant vegetation zones, since natural vegetation serves as a visible indicator of temperature and moisture.
The system was developed by climatologist and botanist Wladimir Köppen, who produced a definition in the late nineteenth century and later modified it. Rudolf Geiger contributed to its refinement and updating, and consequently the system is often called the Köppen–Geiger classification. It remains the most widely used climate classification system in educational texts and climate maps today.
Use of symbols
Each climate is marked by a code of two to three letters. The first letter, capitalized, indicates a broad group: A (tropical humid), B (arid or semi-arid), C (temperate humid with warm or cool summers), D (continental with very cold winters), and E (polar, including tundra and permanent ice). The second letter indicates precipitation distribution across the year (for example: f = precipitation year-round, s = dry summers, w = dry winters, m = monsoon). The third letter, when used, indicates temperature gradation (for example: a, b, c, d, h, k).
Common examples
Af denotes tropical rainforest with year-round precipitation. Aw denotes tropical climate with a dry season (savanna). BWh denotes hot desert, while BSh denotes hot steppe or semi-arid climate. Csa denotes Mediterranean climate: hot dry summers and cool wet winters. Cfb denotes temperate oceanic climate. Dfb denotes temperate continental climate. ET and EF denote tundra and permanent ice.
Uses and limitations
The system is used in agriculture, botany, biogeography, and urban planning. It is also used to assess climate change: when boundaries between climate types shift over time, this demonstrates that regions are transitioning from one climate type to another. A common limitation is that the system depends solely on temperature and precipitation and does not fully account for humidity, wind patterns, and water distribution in soil.