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With regard to temperature, which of the following is correct for the polar climates?
  • A
    The mean temperature of the warmest month is 10°C or above, and of the coldest month below minus 3°C.
  • B
    The mean temperature of all months is below minus 10°C.
  • C
    The mean temperature of all months is below plus 10°C.
  • D
    The mean temperature of all months is above 0°C, but temperatures as high as plus 10°C will never be reached.

Koeppens Climate Classification:

Class A: Tropical rain climate (0°-10° N/S) formerly known as the equatorial climate
Average temperature of coldest month >18°C
Average monthly rainfall >60 mm, no dry season
Equatorial regions

Class B: Dry climate (20°-35° N/S) formerly known as the arid subtropical climate
Evaporation and transpiration exceed precipitation, no permanent water courses
Sahara etc.

Class C: Mid latitude climate or warm temperate (40°-70° N/S) formerly known as the cool temperate climate
Summer and winter seasons
Average temperature of coldest month between -3°C and 18°C
NW Europe
Class D: Sub-arctic climate (snowy forest) (50°N-70°N) formerly known as the boreal climate
Average temperatures: warmest month >10°, coldest month < -3°C
Northern Eurasia/Canada

Class E: Snow climate (>70°N/S) formerly known as the polar climate
Average temperature: warmest month <10°C
N. Greenland, Antarctica etc.

The two transitional climatic zones are:

Tropical transitional climate (10°-20°N/S) formerly known as the savannah climate
Warm dry winter, warm wet summer
NW Africa - Ghana

Temperate transitional climate (35°-40°N/S) formerly known as the warm temperate climate
Warm dry summer, cool wet winter
Mediterranean area

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