Dangerous humid heat days have more than doubled globally since the 1970s, primarily due to human-caused climate change.

Dangerous humid heat days have a daily maximum wet-bulb temperature of 25°C (77°F) or higher. These conditions put many people at risk of heat-related illness.

Climate change is causing more dangerous humid heat days in 65% (161) of 247 U.S. cities analyzed — an average of 19 more days per year during the past decade.

The South and Southeast regions experience the most days with dangerous humid heat in the U.S. Some areas of the Gulf Coast currently experience more than 100 such days annually, on average.

Humid heat risks are expanding across the country. Some places that rarely experienced dangerous humid heat in the past now see more because of climate change, particularly in the Upper Midwest, Ohio Valley, and Northeast.

A new report from Climate Central, Global Analysis: Dangerous Humid Heat Rising Due to Climate Change, explores these increasing global risks. https://www.climatecentral.org/climate-matters/dangerous-humid-heat?utm_medium=email&utm_campaign=CM%20Dangerous%20Humid%20Heat%20EN&utm_content=CM%20Dangerous%20Humid%20Heat%20EN+CID_fa75860a42292d4d20e884ec84393aab&utm_source=Climate%20Central%20Email%20Campaign%20Monitor&utm_term=READ%20THE%20RELEASE%20%20CONTACT%20EXPERTS%20%20FIND%20REPORTING%20RESOURCES