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Share of US land with unusually high summer temperatures
Unusually hot summers are defined based on daily maximum temperatures. At each station, the recorded highs are compared with the full set of historical records. After averaging over a particular month or season of interest, the warmest 10% of years are defined as “unusually hot”.
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NOAA via EPA (2024)
Attribution: National Oceanic and Atmospheric Administration (NOAA)
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