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Evaporation of Monsoon
July 24 , 2026
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- Approximately 25% of India's monsoon rain mass evaporates mid-air before ever touching the ground.
- It was a recent study by the Indian Institute of Tropical Meteorology (IITM), Pune.
- The mid-air loss is dictated primarily by localised atmospheric factors like ambient temperature, heat, and dry air.
- While the average mid-air loss sits at 25%, the exact evaporation rate fluctuates wildly from day to day—ranging from 4% up to 61% depending on ambient weather conditions.
- When water evaporates, lighter water molecules escape into the air first.
- This leaves the remaining falling raindrop highly enriched with heavier hydrogen and oxygen isotopes.
- India's 25% mid-air evaporation rate sits on the lower end of global baselines.
- The primary measurements were gathered over the northern Western Ghats and Pune during the Southwest monsoon season.
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