季节 年代 | 春季 | 夏季 | 秋季 | 冬季 | 年/℃ |
1970s | 15.8 | 26.9 | 19.8 | 8.7 | 17.8 |
1980s | 15.9 | 26.8 | 19.9 | 8.3 | 17.7 |
1990s | 16.4 | 27.0 | 20.1 | 9.1 | 18.2 |
2000s | 17.1 | 27.7 | 21.0 | 9.8 | 18.9 |
2010s | 17.1 | 28.0 | 21.3 | 9.1 | 18.9 |