Porthtowan
| Dg | Dl | Dm | Dc | Dj | Dv | Ds | Dg | |
|---|---|---|---|---|---|---|---|---|
| Vent |  | | | | | | | |
| Direcció | | | | | | | | |
| Mitjana (kn) | 17 | 22 | 6 | 7 | 20 | 21 | 18 | 10 |
| Ràfega (kn) | 25 | 28 | 12 | 12 | 28 | 33 | 30 | 17 |
| Onades | | | | | | | | |
| Direcció | | | | | | | | |
| Alçada (m) | 3.8 | 3.6 | 2.4 | 1.3 | 1.4 | 2.7 | 2.2 | 2.9 |
| Període (s) | 12 | 11 | 10 | 9 | 16 | 16 | 13 | 11 |
| Temp. | 11 | 10 | 8 | 8 | 9 | 10 | 11 | 14 |
| Núvols | 100 | 25 | 100 | 100 | 100 | 100 | 100 | 99 |
| Pluja | 6.8 | 0.3 | 0.1 | 0.5 | 0.9 |