Summer 2023 was northern hemisphere’s hottest for 2,000 years, tree rings show

By Mary Gagen, Professor of Physical Geography, Swansea University

The summer of 2023 was the warmest in the non-tropical areas of the northern hemisphere for 2,000 years, a new study has shown.

Across this vast area of land, encompassing Europe, Asia and North America, surface air temperatures were more than 2°C higher in June, July and August 2023 than the average summer temperature between AD1 and 1890, as reconstructed from tree ring records.

While climate change is a global phenomenon, warming on a regional scale is often stronger. And it is regional…

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