(A) Box plots of hourly wet-bulb globe temperatures (WBGTs) from 1980–2016 and (B) percentage of hours at 30°C–32°C and >32°C WBGT at Yokohama, Japan, during the scheduled period of international football tournaments (July 24–August 9). The boundaries of the box represent the 25th and 75th percentiles. The line within the box indicates the median, the whiskers are the 10th and 90th percentiles, and the points above and below the whiskers are the 5th and 95th percentiles, respectively. The horizontal line marks 32°C WBGT. Abbreviation: LST, Local Standard Time.