Uttar Pradesh, Madhya Pradesh, Rajasthan, Gujarat and Tripura were the top five heatwave hotspot states in the 2013-22 decade, according to a new analysis.

The report, "Managing Monsoons in a Warming Climate" by the independent developmental organisation IPE Global Limited and Esri India Technologies, said 74 per cent of districts in the coastal regions, 71 per cent in the plains, and 65 per cent in the hills had 'high to very high' exposure to extreme heat waves.

It said districts in the plains and hills experienced a 36 per cent increase in heatwave days during the 2013-22 decade while coastal districts recorded a 30 per cent rise.

"Uttar Pradesh, Madhya Pradesh, Rajasthan, Gujarat and Tripura were the top five heatwave hotspot states in this decade," the report stated.

It also noted that the decade recorded fewer cumulative heatwave days compared to the previous two decades.

The decade's most impactful extreme heatwave event occurred in 2015, the second deadliest after the 1998 event.

The analysis suggested that during the March-April-May period and the subsequent June-July-August-September period, districts in the plains experienced the maximum number of heatwave days.

Coastal districts saw a decline in the number of heatwave instances, both in frequency and intensity, in the past decade, which could be attributed to the increase in cyclonic activities in the Bay of Bengal and the Arabian Sea.

Government data shows extreme heat and sunstroke claimed 10,635 lives in India over the 10 years from 2013.

Andhra Pradesh recorded 2,203 deaths during this period, the highest among all states, followed by Uttar Pradesh (1,485), Telangana (1,172), Punjab (1,030), Bihar (938), Maharashtra (867), Odisha (609), Jharkhand (517), Haryana (461), West Bengal (357), Rajasthan (345), Gujarat (263), and Madhya Pradesh (213).

Delhi recorded 13 such deaths.

The maximum number of deaths (1,908) were recorded in 2015.

This summer, India experienced 536 heatwave days, the highest in 14 years, with the northwestern region recording its warmest June since 1901, according to the India Meteorological Department (IMD).

The country recorded 181 heatwave days in June, the highest since 2010.

Official data shows that India recorded 41,789 suspected heat stroke cases and 143 heat-related deaths in 2024, during one of its hottest and longest heat waves.

The intense heat overwhelmed the water supply system and power grids, with Delhi grappling with a severe water crisis. Temperatures breached 50 degrees Celsius in parts of Rajasthan, with nighttime temperatures hovering around 35 degrees Celsius in many places.

In Delhi, which logged 40 consecutive days of temperatures above 40 degrees Celsius since May 13, there were around 60 heat-related deaths this year, according to reports.

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