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Which set of surface values for temperature/relative humidity and freezing level is typical for the tropical rain climate?
  • A
    +20°C, 90%, FL100.
  • B
    +42°C, 20%, FL220.
  • C
    +15°C, 60%, FL75.
  • D
    +28°C, 80%, FL150.

Refer to figure.
Tropical rain climate (0°-10° N/S) formerly known as the equatorial climate
Average temperature of coldest month >18°C
Average temperature around 28°C Average monthly rainfall >60 mm, no dry season
Relative humidity around 80% Equatorial regions

The freezing level can be calculated by using the average temperature gradient of 2°C/1000 ft.
Use the average temperature of 28°C, divide it by 2°C and multiply the result by 1000 ft: 28°C / 2°C × 1000 ft = 14 000 ft (next to the correct answer of 15 000 ft).

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