Table 2.
Wet-bulb globe temperature (WBGT) by time of day in the previous three Summer Olympics and the expected periods of the Tokyo 2020 Summer Olympics
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| Tokyo | 30 (29–32) | 30 (28–31) | 30 (28–31) | 33 (31–35) | 34 (32–36) | 34 (32–36) | 33 (31–34) | 31 (30–33) |
| Rio de Janeiro | 23 (22–24) | 23 (21–23) | 22 (20–23) | 26 (25–28) | 31 (27–32) | 30 (26–31) | 29 (25–31) | 26 (24–27) |
| London | 18 (16–19) | 17 (15–18) | 18 (16–19) | 21 (19–22) | 22 (21–24) | 22 (21–24) | 21 (21–24) | 19 (18–20) |
| Beijing | 21 (20–25) | 21 (20–24) | 24 (22–27) | 29 (27–31) | 31 (30–32) | 31 (30–32) | 27 (26–28) | 24 (22–25) |
Median (25th–75th percentile) WBGT (°C) Tokyo: 24 July to 9 August from 2008 to 2017 (dates scheduled for Tokyo 2020 Summer Olympics) Rio de Janeiro: 5–21 August 2016 London: 25 July–12 August 2012 Beijing: 8–24 August 2008