| (a) Summer maximum | (b) Winter minimum | ||||
| Δ20 s | Δ50 s | Δ80 s | Δ20 s | Δ50 s | Δ80 s |
WK | 1.2 | 2.5 | 3.7 | 1.9 | 3.8 | 5.4 |
SP | 1.3 | 2.6 | 3.8 | 1.7 | 4.1 | 5.5 |
MM | 1.1 | 2.3 | 3.3 | 2.1 | 3.5 | 5.0 |
TH | 1.4 | 2.6 | 4.0 | 1.9 | 3.2 | 4.7 |