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CHART 1 • Britain must plan beyond 40°C
Britain’s homes, hospitals, schools and railways must cope with temperatures outside the conditions for which many were designed. The underlying level of the country’s hottest day has risen by roughly 5°C since 1970, even though individual summers remain highly variable.
Greenhouse gases retain additional heat, raising the starting temperature when high pressure, continental air and dry ground combine. Those conditions helped produce the 40.3°C record in 2022. Under 2°C of global warming, a comparably unusual heatwave could approach 43°C. The red point represents that scenario, not a forecast for a particular day in 2050. Summer 2026 supplied a different warning: it was provisionally Britain’s hottest by seasonal measures despite a daily peak below the record.
Source: Financial Times
I would pay more attention to the rising grey line than to any isolated spike. Set beneath the jagged annual readings, it separates a structural shift from the noise of British weather and explains why a cooler peak offers planners little reassurance. Britain must prepare for both a still hotter day and prolonged heat that strains people and infrastructure without breaking the national record.
Paid subscribers get access to the other four charts: California’s summer Covid pattern, teenage screen use, protein quality and Germany’s energy-driven inflation. Together, they show why timing and composition matter for public health, household costs and practical preparation.
