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Why do continental subarctic climates have such large yearly temperature ranges?
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Köppen climate classification
The major climatic types are based on patterns of average precipitation, average temperature, and natural vegetation. This map depicts the world distribution of climate types based on the classification originally invented by Wladimir Köppen in 1900.
Continental subarctic climates exhibit the largest annual temperature ranges on Earth due to the phenomenon of continentality, which describes the significant difference in temperature fluctuations between land and water.12
Land surfaces possess a much lower effective heat capacity than water, meaning they heat up and cool down rapidly. In continental subarctic regions, this effect is intensified by the following factors:32
- Low Heat Retention: Land surfaces conduct heat poorly and contain little moisture for evaporation, allowing for extreme temperature swings in a thin surface layer.32
- Extreme Seasonal Extremes: These climates are dominated by long, bitterly cold winters—often influenced by cold polar air masses like the Siberian anticyclone—followed by short, mild summers where temperatures can rise significantly in interior regions.1
- Lack of Marine Moderation: Because these areas are located deep within continental interiors, they lack the moderating influence of the ocean, which typically keeps temperatures more stable in coastal regions.13
As a result, annual temperature ranges can exceed 60 °C (108 °F) in central Siberia.1