Summer heat is most obvious by day, as the sun bakes down and temperatures rise with increasing intensity. But a less noticeable trend is happening while most people sleep: Nighttime temperatures are accelerating, fueled by a summer of extreme humidity.
Nearly half of the planet has experienced record or near-record high minimum temperatures since the start of June, according to a Washington Post analysis of historical weather data. That includes unprecedented overnight warmth across much of the eastern United States and parts of Europe and Asia.
At the same time, nearly two-thirds of those areas have also endured record or near-record levels of humidity. The United States is suffering through one of its most humid summers on record, with 18 states and D.C. experiencing record humidity levels during July.
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