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In this case, the term \u201cunusually hot\u201d refers to a daily maximum temperature that is hotter than the 95th percentile temperature during the 1948\u20132017 period. Thus, the maximum temperature on a particular day at a particular station would be considered \u201cunusually hot\u201d if it falls within the warmest 5 percent of measurements at that station during the 1948\u20132017 period. The map shows changes in the total number of days per year that were hotter than the 95th percentile. Red upward-pointing symbols show where these unusually hot days are becoming more common. Blue downward-pointing symbols show where unusually hot days are becoming less common. 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