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U.S. Heat Waves Break Climate Records
Coverage from The Honest Broker, Climate Central, and others
Record-breaking heat affected the U.
S. Southwest in March 2026 and much of the country in July, with temperatures exceeding seasonal records and forecasts pointing to dangerous heat across a wide area. Attribution analyses concluded that the March event was virtually impossible without human-caused warming, while Climate Central estimated that climate change made the July heat at least five times more likely. The developments highlight growing risks for public health, drought and wildfire conditions, emergency planning, and assessments of how extreme-weather trends are changing.
The main update is a sharper attribution and risk framing: the March heat is now described as virtually impossible without human-caused warming, while the July episode is quantified as at least five times more likely because of climate change. The story also adds a new U.S. dashboard tracking 32 extreme-weather variables, reinforcing the broader trend-monitoring angle.
The story broadens from a March-and-July heat attribution narrative into a more geographically expansive assessment that now explicitly includes the southern Great Plains, northwest Mexico, and a broader swath of U.S. regions affected by the July episode. The framing also shifts from general evidence of warming-driven heat risk to a stronger claim that these episodes are part of intensifying U.S. heat extremes with practical planning consequences.