Abstract
In the past half century, the mean summertime temperature in the United States has increased1,4, with nights warming more than days5,6. When humidity is high, hot weather can cause heat stress in humans. Here we show that the frequency of extreme heat-stress events in the United States, caused by extremely hot and humid days as well as by heatwaves lasting for several days, has increased over the period from 1949 to 1995.
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Gaffen, D., Ross, R. Increased summertime heat stress in the US. Nature 396, 529–530 (1998). https://doi.org/10.1038/25030
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DOI: https://doi.org/10.1038/25030
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