Table 5.
Regional statistics of temperature changes within the Sixth Ring Road of Beijing.
| Temperature range | Year | |||||||
|---|---|---|---|---|---|---|---|---|
| 1991 | 1999 | 2011 | 2020 | |||||
| Area/km 2 | Proportion/% | Area/km 2 | Proportion/% | Area/km 2 | Proportion/% | Area/km 2 | Proportion/% | |
| Low | 1,179.42 | 51.99 | 225.55 | 9.94 | 16.89 | 0.74 | 13.23 | 0.58 |
| Lower-medium | 952.68 | 41.99 | 1,645.46 | 72.53 | 1,046.80 | 46.14 | 241.43 | 10.64 |
| Medium | 135.68 | 5.98 | 390.66 | 17.22 | 1,132.35 | 49.91 | 1,600.29 | 70.54 |
| Higher-medium | 0.81 | 0.04 | 6.56 | 0.29 | 71.24 | 3.14 | 408.18 | 17.99 |
| High | 0.01 | 0.00 | 0.35 | 0.02 | 1.30 | 0.06 | 5.25 | 0.23 |
| Extreme-high | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 | 0.21 | 0.01 |