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The Conversation
The Conversation
Michael Wysession, Professor of Earth, Environmental, and Planetary Sciences, Washington University in St. Louis

2025 was hotter than it should have been – 5 influences and a dirty surprise offer clues to what’s ahead

The sun rises over New York City as a heat wave arrives in June 2025. Gary Hershorn/Getty Images

The past three years have been the world’s hottest on record by far, with 2025 almost tied with 2023 for second place. With that energy came extreme weather, from flash flooding to powerful hurricanes and severe droughts. Yet, by most indicators, the planet should have been cooler in 2025 than it was.

So, what happened, and what does that say about the year ahead?

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