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"In late June and early July 2026, a pronounced heatwave affected large parts of the United States and southern Canada, bringing exceptionally high temperatures and widespread heat warnings to tens of millions of people. Among various health, environmental, social and economic impacts, this heatwave has affected football (soccer) matches of the FIFA World Cup 2026 and the 250th anniversary celebration of the US (the Independence Day parade in Washington DC was cancelled). Temperature records were tied or broken at numerous locations across the United States and Canada during the heatwave. For example, Atlantic City, New Jersey, reached 41°C (106°F) on the 4th of July (Independance Day) breaking their all-time record high temperature.  Although temperatures typically did not go above 30°C (86°F) in Ontario, Quebec, New Brunswick and Nova Scotia,  the unusual heat and humidity contributed to the development of severe thunderstorms on the 1st of July (Canada Day), pointing to the broad range of weather hazards associated with this extreme temperature event."

"ClimaMeter found that meteorological conditions similar to this early summer 2026 North America heatwave have become up to 2.5°C (4.5°F) warmer in the present-day climate than in the past. The exposure analysis shows that about 50.36 million people and 3.30 trillion USD of economic activity were in the region that experienced these extreme heat conditions intensified by climate change. We interpret this heatwave as an extreme weather event driven by very rare meteorological conditions, a stalled blocking high, whose intensity has been amplified by long-term climate change."

"The record-breaking heatwave that gripped large parts of Western Europe beginning June 21th was primarily driven by meteorological conditions intensified by human-driven climate change, according to a study by the ClimaMeter team."

"• Meteorological conditions similar to those causing the June 2026 western European heatwave are up to 2.5°C hotterr than they were only about 30 years ago  and likely about 3.5 °C hotter than 50 years ago."

Key Topics & Focus Areas for climameter.org:

ClimaMeter is a rapid framework for understanding extreme weather events in a changing climate based on looking at similar past weather situations.  ClimaMeter is hosted by the Institut Pierre Simon Laplace.

Heatwave over eastern North America in the late June-early July 2026 intensified by climate change

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Climate change pushed the record-breaking June 2026 Western European heatwave to new extremes

Record winter temperatures in Antarctica intensified by human-driven climate change

Read full report here