Harlech
| Dm | Dc | Dj | Dv | Ds | Dg | Dl | Dm | |
|---|---|---|---|---|---|---|---|---|
| Vent |  | | | | | | | |
| Direcció | | | | | | | | |
| Mitjana (kn) | 20 | 9 | 16 | 25 | 15 | 15 | 23 | 6 |
| Ràfega (kn) | 22 | 11 | 17 | 32 | 16 | 24 | 36 | 6 |
| Onades | | | | | | | | |
| Direcció | | | | | | | | |
| Alçada (m) | 1.4 | 0.4 | 0.9 | 1.1 | 0.8 | 1.2 | 1.6 | 0.8 |
| Període (s) | 6 | 18 | 13 | 12 | 14 | 7 | 8 | 13 |
| Temp. | 7 | 4 | 5 | 4 | 4 | 6 | 8 | 9 |
| Núvols | 13 | 100 | 34 | 100 | 100 | 100 | 100 | 100 |
| Pluja | 0.3 | 0.2 | 13.1 | 1.1 | 0.1 | 0.6 |