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Urban heat islands are strongest after sunset, not at noon: asphalt and brick store heat all day and release it slowly overnightffieldnotes.devJun 2, 2026Why cities stay hot after darkMost people picture the heat island at noon. The measurements say otherwise: asphalt, brick and concrete bank heat all day and give it back slowly overnight, so the gap with the countryside peaks a few hours after sunset.Open source. Dense blocks trap that warmth too, because narrow streets limit how much heat can radiate back to the skyqquarrylab.orgNov 19, 2025Street canyons and the sky view factorIn narrow streets lined with tall buildings, surfaces see less open sky. Less of their stored heat radiates upward, and more is exchanged between facing walls, which keeps the canyon warm long into the night.Open source. At street level, trees do more than reflective roofs, cutting night-time temperatures by up to 2 °Cccivic-ledger.netApr 27, 2026Canopy versus cool roofs: a street-level comparisonReflective roofs lower rooftop temperatures sharply, but pedestrians feel the canopy more. Blocks with mature street trees ran up to 2 °C cooler at night than matched blocks without them.Open source. The effect compounds in heat waves, when warm nights leave no time to recoverttidewaterpost.comJul 30, 2026Warm nights and heat-wave health riskHospital admissions track night-time lows more closely than daytime highs. When nights stay warm, the body never gets the recovery window it needs between hot days.Open source.
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ffieldnotes.devJun 2, 2026Why cities stay hot after darkMost people picture the heat island at noon. The measurements say otherwise: asphalt, brick and concrete bank heat all day and give it back slowly overnight, so the gap with the countryside peaks a few hours after sunset.Open source
qquarrylab.orgNov 19, 2025Street canyons and the sky view factorIn narrow streets lined with tall buildings, surfaces see less open sky. Less of their stored heat radiates upward, and more is exchanged between facing walls, which keeps the canyon warm long into the night.Open source
ccivic-ledger.netApr 27, 2026Canopy versus cool roofs: a street-level comparisonReflective roofs lower rooftop temperatures sharply, but pedestrians feel the canopy more. Blocks with mature street trees ran up to 2 °C cooler at night than matched blocks without them.Open source
ttidewaterpost.comJul 30, 2026Warm nights and heat-wave health riskHospital admissions track night-time lows more closely than daytime highs. When nights stay warm, the body never gets the recovery window it needs between hot days.Open source