State of the Planet

News from the Columbia Climate School

Interactive Map: Daily Maximum Wet-Bulb Temperature

A new study shows that extreme, sometimes potentially fatal, mixtures of heat and humidity are emerging across the globe. The interactive world map below shows documented instances, with hotter colors from yellow to red signifying the worst combinations as measured on the Centigrade “wet bulb” scale. Read the full story: “Potentially Fatal Combinations of Humidity and Heat Are Emerging Across the Globe. (Map: Jeremy Hinsdale; adapted from Raymond et al., Science Advances, 2020; updated May, 2025)

Usage: Use trackpad or buttons to zoom, drag and drop to move; zoom in to view data points; click points to view temperature and location information.

< 17.75 20 22.25 24.5 26.75 29 31.25 33.5 >
Photo of the Earth from space with the text "Lamont at AGU25" on top.

AGU25, the premier Earth and space science conference, takes place December 15-19, 2025 in New Orleans, Louisiana. This year’s theme—Where Science Connects Us—puts in focus how science depends on connection, from the lab to the field to the ballot box. Once again, Lamont-Doherty Earth Observatory and Columbia Climate School scientists, experts, students, and educators are playing an active role, sharing our research and helping shape the future of our planet. #AGU25 Learn More

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