The Isotherm Line, which divides India North-South in almost two equal

The Isotherm Line, which divides India North-South in almost two equal parts in the month of January, is

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10 °C

25 °C

15 °C

20 °C

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UPSC CDS-2 – 2020

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The Isotherm Line, which divides India North-South in almost two equal parts in the month of January, is approximately the 20 °C isotherm.

In January, North India experiences cold weather due to the influence of the Himalayas and continental winds, with average temperatures often below 15°C. South India, being closer to the Equator and influenced by maritime conditions, remains warm, with temperatures generally above 20°C or 25°C. The 20°C isotherm typically runs across central India, separating the cooler northern plains from the warmer southern peninsula, effectively dividing the country into roughly two halves based on temperature distribution in January.

Isotherms are lines on a map connecting points that have the same temperature. The temperature distribution in India during winter (January) is characterized by a decrease from south to north. The 25°C isotherm generally lies further south, while the 15°C and 10°C isotherms are located further north, primarily in the plains and foothills respectively.

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