| Alishan | 3.1 | 4.1 | 6.1 | 8.4 | 10.2 | 11.6 | 11.6 | 11.7 | 11.0 | 9.1 | 7.4 | 4.6 | 8.2 | 1991~2020 |
| Anbu | 8.1 | 8.7 | 10.3 | 13.7 | 17.2 | 19.9 | 20.9 | 20.7 | 19.1 | 16.3 | 13.5 | 9.8 | 14.9 | 1991~2020 |
| Chenggong | 16.5 | 16.9 | 18.3 | 20.6 | 22.8 | 24.6 | 25.2 | 25.0 | 24.2 | 22.6 | 20.4 | 17.8 | 21.2 | 1991~2020 |
| Chiayi | 12.9 | 14.1 | 16.2 | 19.5 | 22.6 | 24.7 | 25.4 | 25.2 | 24.0 | 21.1 | 18.0 | 14.2 | 19.8 | 1991~2020 |
| Tamsui | 12.7 | 13.0 | 14.7 | 18.3 | 21.6 | 24.2 | 25.7 | 25.5 | 23.8 | 20.9 | 18.3 | 14.6 | 19.4 | 1991~2020 |
| Dawu | 17.7 | 18.2 | 19.6 | 21.6 | 23.5 | 25.0 | 25.3 | 25.1 | 24.3 | 23.0 | 21.4 | 19.0 | 22.0 | 1991~2020 |
| Dongjidao | 16.7 | 16.9 | 18.9 | 21.9 | 24.4 | 26.2 | 26.9 | 26.6 | 26.0 | 24.3 | 21.8 | 18.6 | 22.4 | 1991~2020 |
| Hengchun | 18.6 | 19.0 | 20.5 | 22.6 | 24.5 | 25.8 | 26.0 | 25.6 | 25.1 | 24.1 | 22.5 | 20.0 | 22.9 | 1991~2020 |
| Hsinchu | 13.1 | 13.4 | 15.2 | 18.9 | 22.2 | 24.9 | 26.0 | 25.8 | 24.4 | 21.8 | 18.8 | 15.1 | 20.0 | 1992~2020 |
| Hualien | 15.8 | 16.2 | 17.6 | 20.1 | 22.5 | 24.7 | 25.6 | 25.4 | 24.2 | 22.2 | 19.9 | 17.2 | 21.0 | 1991~2020 |
| Kaohsiung | 16.2 | 17.2 | 19.7 | 22.8 | 25.2 | 26.3 | 26.7 | 26.3 | 25.9 | 24.4 | 21.6 | 17.9 | 22.5 | 1991~2020 |
| Keelung | 14.2 | 14.3 | 15.7 | 19.0 | 22.3 | 25.0 | 26.7 | 26.5 | 25.0 | 22.4 | 19.6 | 16.1 | 20.6 | 1991~2020 |
| Lanyu | 17.0 | 17.4 | 18.7 | 20.7 | 22.7 | 24.3 | 24.6 | 24.3 | 23.6 | 22.3 | 20.5 | 18.1 | 21.2 | 1991~2020 |
| Penghu | 15.5 | 15.6 | 17.8 | 21.1 | 24.0 | 25.9 | 26.7 | 26.6 | 26.1 | 24.0 | 21.3 | 17.7 | 21.9 | 1991~2020 |
| Pengjiayu | 13.9 | 14.2 | 15.5 | 18.5 | 21.6 | 24.3 | 26.0 | 25.9 | 24.7 | 22.2 | 19.4 | 15.8 | 20.2 | 1991~2020 |
| Su-ao | 14.3 | 14.7 | 16.3 | 19.1 | 22.0 | 24.6 | 26.0 | 25.7 | 24.3 | 21.8 | 19.0 | 15.8 | 20.3 | 1991~2020 |
| Sun Moon Lake | 11.3 | 12.1 | 13.9 | 16.3 | 18.5 | 19.7 | 20.1 | 20.0 | 19.5 | 17.9 | 15.7 | 12.7 | 16.5 | 1991~2020 |
| Taichung | 13.4 | 14.2 | 16.4 | 20.1 | 23.1 | 24.9 | 25.5 | 25.3 | 24.6 | 22.2 | 19.0 | 15.1 | 20.3 | 1991~2020 |
| Tainan | 14.6 | 15.4 | 18.0 | 21.6 | 24.6 | 26.2 | 26.6 | 26.3 | 25.8 | 23.3 | 20.2 | 16.4 | 21.6 | 1991~2020 |
| Taipei | 14.2 | 14.4 | 16.0 | 19.3 | 22.6 | 25.1 | 26.6 | 26.4 | 25.0 | 22.4 | 19.7 | 16.0 | 20.6 | 1991~2020 |
| Taitung | 17.1 | 17.5 | 19.0 | 21.3 | 23.7 | 25.5 | 26.2 | 26.1 | 25.0 | 23.2 | 21.1 | 18.3 | 22 | 1991~2020 |
| Wuqi | 13.7 | 14.0 | 16.1 | 19.9 | 23.2 | 25.6 | 26.7 | 26.4 | 25.1 | 22.2 | 19.3 | 15.6 | 20.7 | 1991~2020 |
| Yilan | 14.0 | 14.4 | 16.0 | 18.8 | 21.7 | 24.3 | 25.6 | 25.4 | 24.0 | 21.3 | 18.7 | 15.5 | 20.0 | 1991~2020 |
| Yushan | -4.0 | -3.4 | -1.7 | 0.6 | 3.0 | 4.5 | 4.6 | 4.6 | 4.1 | 2.8 | 0.7 | -2.1 | 1.1 | 1991~2020 |
| Zhuzihu | 9.7 | 10.3 | 11.9 | 15.3 | 18.6 | 21.3 | 22.4 | 22.2 | 20.7 | 17.9 | 15.1 | 11.4 | 16.4 | 1991~2020 |