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The Cool Temperate Eastern Margin (Laurentian) Climate – Geography

World Climate Types - The Cool Temperate Eastern Margin (Laurentian) Climate


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The Cool Temperate Eastern Margin (Laurentian) Climate


Distribution – Northern Hemisphere

  • Laurentian type of climate is found only in two regions.
  • Only in the northern hemisphere.

Distribution – Not in Southern Hemisphere

  • Only a small section of continents extends south of 40°S latitude.
  • These small sections come under the rain-shadow region of Andes (Patagonia) – leading to aridity and also Westerlies hardly ever reach these regions.
  • In other regions, the oceanic influence is very profound.

Natural Vegetation

  • Forest tend to be coniferous north of the 50°N latitude.
  • South of 50 degree latitude the coniferous give way to deciduous forest .

Economic Development

  • Lumbering – timber, paper and pulp industries.
  • Fishing is, however, the most outstanding economic activity.


Rainfall – The North American region

  • Precipitation occurs all-round the year due to the influence of Atlantic ocean (summer) and the Great Lakes (winter).
  • Westerlies carry moisture from Great Lakes causing wet conditions in winter.
  • Warm Gulf Stream increases the moisture of easterly winds.
  • Convergence of the warm Gulf Stream and the cold Labrador Current near Newfoundland rise to much precipitation.

Great Lakes

Rainfall – The Asiatic region

  • Rainfall regime resembles the tropical monsoon type in India.
  • Intense heating of the mountainous interior of China in summer creates a region of extreme low pressure, and moisture-laden winds from the Pacific Ocean and the Sea of Japan blow in as the South-East Monsoon.
  • Rainfall distribution of the Asiatic region is far less uniform when compared to North American Region.
  • The warm Kuroshio makes the climate of Japan less extreme.
  • The climate of Japan is modified by the meeting of warm and cold ocean currents.
  • It receives adequate rainfall from both the South-East Monsoon in summer and the North-West Monsoon(Sea of Japan) in winter.

Temperature  – The Asiatic region

  • Winters are cold and very dry while summers are very warm and exceptionally wet.

Note – Much of the winter precipitation in northern China, Korea and Hokkaido, Japan, is in the form of snow.

Polar Easterlies

Ocean Currents


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