| Alishan | 11.0 | 11.7 | 13.9 | 15.7 | 17.2 | 18.4 | 19.3 | 18.8 | 18.5 | 17.4 | 15.6 | 12.6 | 15.8 | 1991~2020 |
| Anbu | 13.3 | 14.6 | 17.1 | 20.5 | 23.2 | 25.6 | 27.4 | 26.8 | 24.3 | 20.5 | 18.1 | 14.6 | 20.5 | 1991~2020 |
| Chenggong | 22.4 | 22.9 | 24.3 | 26.7 | 29.0 | 30.7 | 31.8 | 31.6 | 30.7 | 28.8 | 26.4 | 23.5 | 27.4 | 1991~2020 |
| Chiayi | 22.5 | 23.0 | 25.4 | 28.4 | 30.9 | 32.8 | 33.4 | 32.8 | 32.1 | 30.1 | 27.6 | 24.3 | 28.6 | 1991~2020 |
| Tamsui | 18.8 | 19.3 | 21.6 | 25.4 | 28.8 | 31.3 | 33.3 | 33.1 | 30.9 | 27.1 | 24.4 | 20.6 | 26.2 | 1991~2020 |
| Dawu | 23.7 | 24.4 | 26.2 | 28.7 | 30.7 | 32.6 | 32.8 | 32.3 | 31.2 | 29.4 | 27.4 | 24.6 | 28.7 | 1991~2020 |
| Dongjidao | 20.0 | 20.6 | 23.2 | 26.1 | 28.5 | 29.9 | 31.0 | 30.8 | 30.0 | 27.7 | 25.1 | 21.7 | 26.2 | 1991~2020 |
| Hengchun | 24.4 | 25.5 | 27.3 | 29.5 | 31.2 | 31.8 | 32.1 | 31.8 | 31.3 | 29.7 | 27.8 | 25.1 | 29.0 | 1991~2020 |
| Hsinchu | 19.1 | 19.4 | 21.6 | 25.5 | 28.9 | 31.5 | 33.2 | 32.8 | 31.2 | 28.0 | 25.1 | 21.1 | 26.5 | 1992~2020 |
| Hualien | 21.4 | 21.9 | 23.6 | 26.2 | 28.7 | 30.9 | 32.4 | 32.2 | 30.7 | 28.3 | 25.8 | 22.8 | 27.1 | 1991~2020 |
| Kaohsiung | 24.2 | 25.0 | 27.0 | 29.3 | 31.0 | 32.1 | 32.7 | 32.1 | 31.8 | 30.1 | 28.1 | 25.3 | 29.1 | 1991~2020 |
| Keelung | 18.4 | 19.1 | 21.0 | 24.7 | 28.0 | 31.2 | 33.3 | 32.5 | 29.8 | 26.1 | 23.6 | 20.1 | 25.7 | 1991~2020 |
| Lanyu | 20.8 | 21.4 | 22.9 | 24.8 | 26.7 | 28.0 | 28.6 | 28.5 | 27.7 | 25.9 | 23.9 | 21.5 | 25.1 | 1991~2020 |
| Penghu | 19.4 | 20.0 | 22.9 | 26.3 | 29.1 | 30.9 | 32.2 | 31.8 | 31.0 | 28.2 | 25.1 | 21.3 | 26.5 | 1991~2020 |
| Pengjiayu | 17.9 | 18.5 | 20.3 | 23.4 | 26.4 | 29.3 | 31.3 | 31.1 | 29.0 | 25.9 | 23.1 | 19.6 | 24.7 | 1991~2020 |
| Su-ao | 19.3 | 19.9 | 22.0 | 24.9 | 27.6 | 30.4 | 31.8 | 31.5 | 29.7 | 26.5 | 23.8 | 20.6 | 25.7 | 1991~2020 |
| Sun Moon Lake | 19.4 | 20.3 | 22.1 | 24.2 | 26.0 | 27.2 | 28.3 | 27.8 | 27.2 | 25.6 | 23.6 | 20.5 | 24.4 | 1991~2020 |
| Taichung | 22.3 | 22.9 | 25.2 | 28.1 | 30.7 | 32.3 | 33.3 | 32.7 | 32.2 | 30.3 | 27.6 | 23.9 | 28.5 | 1991~2020 |
| Tainan | 23.0 | 24.0 | 26.6 | 29.3 | 31.4 | 32.4 | 33.0 | 32.6 | 32.4 | 30.8 | 28.1 | 24.4 | 29 | 1991~2020 |
| Taipei | 19.4 | 20.3 | 22.7 | 26.4 | 29.7 | 32.7 | 34.8 | 34.2 | 31.5 | 27.6 | 24.8 | 21.0 | 27.1 | 1991~2020 |
| Taitung | 23.2 | 23.8 | 25.4 | 27.8 | 30.0 | 31.8 | 32.6 | 32.2 | 31.3 | 29.4 | 27.1 | 24.3 | 28.2 | 1991~2020 |
| Wuqi | 19.2 | 19.6 | 22.3 | 26.0 | 28.9 | 31.1 | 32.2 | 31.9 | 30.8 | 28.0 | 25.1 | 21.2 | 26.4 | 1991~2020 |
| Yilan | 19.7 | 20.4 | 22.7 | 25.7 | 28.5 | 31.4 | 33.2 | 32.8 | 30.6 | 27.1 | 24.2 | 20.9 | 26.4 | 1991~2020 |
| Yushan | 4.6 | 4.5 | 6.4 | 8.7 | 11.2 | 12.9 | 14.4 | 14.0 | 14.0 | 13.9 | 10.6 | 6.7 | 10.2 | 1991~2020 |
| Zhuzihu | 15.4 | 16.6 | 19.1 | 22.5 | 25.4 | 27.8 | 29.7 | 29.3 | 26.8 | 22.9 | 20.3 | 16.7 | 22.7 | 1991~2020 |