| Stations: 14 | Humidity |
| Aberdaron (94 m) | 98 % |
| Aberporth (134 m) | 100 % |
| Capel Curig (215 m) | 82 % |
| Cardiff Airport (67 m) | 70 % |
| Lake Vyrnwy (359 m) | 82 % |
| Milford Haven (32 m) | 89 % |
| Mumbles (32 m) | 75 % |
| Pembrey Burrows (6 m) | 80 % |
| Raf Mona (62 m) | 94 % |
| Rhyl (76 m) | 89 % |
| Sennybridge (307 m) | 83 % |
| St Athan (49 m) | 68 % |
| Trawscoed (62 m) | 87 % |
| Valley (10 m) | 93 % |