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- Over decades, the average number of days spent in heat waves in the U.S. annually has increased, based on increases in both the average annual number of heat waves and on their average durations. (en)
- Also, heat wave seasons have grown in length. (en)
- US heat waves have increased in frequency, average duration, and intensity. (en)
- Large increases in both the frequency and intensity of extreme weather events are expected. (en)
- New high temperature records have outpaced new low temperature records on a growing portion of Earth's surface. (en)
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