The hottest month on record was set at 3am
July 2026 was the hottest month the contiguous US has recorded in 131 years: 76.9°F average, 3.3°F above the 20th-century norm. But the days didn't set it: daytime highs ranked only sixth-warmest. Overnight lows were the warmest ever measured, 64.2°F average, 0.7°F above the old mark (NOAA).
Pattern, not fluke: over much of the US, nights warm faster than days, and nights that never drop below 70°F are increasing everywhere except the Northern Great Plains (Fifth National Climate Assessment).
Your body sleeps by shedding heat into air cooler than itself. Hot nights cost the average person ~44 hours of sleep a year (One Earth 2022), unevenly: women ~25% more than men per degree, adults 65+ double, lower-income countries triple. No sign of adaptation.
Bottom line: the record was set at 3am. Relief isn't coming at night; policy built around daytime highs targets the wrong half of the day. Cooling access is health infrastructure.
Sources: ncei.noaa.gov/news/national-climate-202607 | doi.org/10.1016/j.oneear.2022.04.008 | nca5.climate.us
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