Official temperature thresholds and classification system used by IMD to declare heat waves across different geographical zones of India.
The IMD has been issuing frequent heat wave warnings as temperatures across Northern, Central, and Eastern India consistently crossed 45°C to 48°C in June 2026, with all 50 of the world's hottest cities recorded inside India on a single day.
|
Term |
Detail |
|
Plains Threshold |
40°C minimum for heat wave declaration |
|
Coastal Threshold |
37°C minimum for heat wave declaration |
|
Hilly Threshold |
30°C minimum for heat wave declaration |
|
Severe Heat Wave |
Temperature >6.4°C above normal |
|
Night Temperature Rise |
0.21°C per decade in India |
|
IMD Parent Ministry |
Ministry of Earth Sciences |
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