Search Climate Insights Directory

A World Weather Attribution study finds that climate change has shifted extreme heat earlier into the year in Saudi Arabia, making May temperatures in Mecca as dangerous as summer temperatures were between 1970 and 1990. The analysis indicates that peak May temperatures are now approximately 2°C hotter and average May temperatures are approximately 3.5°C higher than in a preindustrial climate. This trend increases the risk of heat stroke and exhaustion for millions of pilgrims, with projections suggesting that if global temperatures rise by 3°C, 97% of Hajj pilgrimages would occur during periods of dangerous heat.

Between June 16 and 24, 2024, approximately 4.97 billion people—over 60% of the global population—were exposed to extreme heat that was at least three times more likely to occur due to climate change. The analysis, using the Climate Shift Index (CSI), highlights severe impacts across India, China, Indonesia, Nigeria, Brazil, and the United States, as well as lethal heat waves in Saudi Arabia, Mexico, and Egypt.