Climate change has added an average of 49 humid heat days each year between 2016 and 2025 across India, according to a new study. The research highlights that states including Rajasthan, Delhi, Haryana, parts of Uttar Pradesh, Telangana, and Chhattisgarh experienced the most severe impacts.
Study Findings on Humid Heat Days
The study, conducted by a team of climate scientists, analyzed temperature and humidity data over the past decade. It found that the frequency of days with dangerously high wet-bulb temperatures—a measure combining heat and humidity—has risen sharply due to human-induced climate change. The additional 49 days per year represent a significant increase compared to the pre-industrial baseline.
According to the lead author, Dr. Anjali Sharma of the Indian Institute of Tropical Meteorology, "The combination of rising temperatures and increased moisture in the air is making heatwaves more oppressive and dangerous. Our findings underscore the urgent need for adaptation measures."
Regional Impact and Vulnerability
Rajasthan recorded the highest number of additional humid heat days, followed by Delhi, Haryana, and parts of Uttar Pradesh. In Telangana and Chhattisgarh, the increase was also notable, affecting agricultural productivity and public health. The study noted that urban areas, with their heat island effect, are particularly vulnerable.
"These regions are already prone to extreme heat, and the added humidity exacerbates health risks, especially for outdoor workers and the elderly," said co-author Dr. Ravi Kumar.
Implications for Health and Economy
The additional humid heat days are linked to increased mortality and morbidity from heat-related illnesses such as heatstroke and dehydration. The study estimates that labor productivity in sectors like construction and agriculture could drop by up to 15% during these days. The economic impact could run into billions of dollars annually if mitigation measures are not implemented.
"We need to invest in early warning systems, cooling centers, and heat-resistant infrastructure," the authors recommended.
