National Network of Regional Coastal Monitoring Programmes
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Note that these are real-time data and are not quality-controlled. Long-range graphs are plotted from a randomised subsample of half-hourly data.
St Mary's Sound
Average values for 2025
| Month | Hs (m) | Tp (s) | Tz (s) | Dirp (degrees) | TSea (degrees C) |
|---|---|---|---|---|---|
| January | 1.88 | 9.6 | 5.7 | 206 | 11.3 |
| February | 1.87 | 8.3 | 5.4 | 186 | 10.7 |
| March | 1.17 | 8.7 | 5 | 201 | 10.9 |
| April | 1.22 | 7.5 | 4.8 | 182 | 11.6 |
| May | 0.77 | 6.9 | 4.3 | 186 | 13.4 |
| June | 0.84 | 7.3 | 4.7 | 243 | 14.5 |
| July | 0.7 | 7.5 | 4.7 | 260 | 15.9 |
| August | 0.95 | 7.9 | 4.7 | 215 | 16.8 |
| September | 1.26 | 8.3 | 5.1 | 225 | 15.3 |
| October | 1.28 | 8.2 | 4.9 | 215 | 14.3 |
| November | 1.62 | 8.4 | 5.3 | 207 | 13.3 |
| December | 2.57 | 9.7 | 6.3 | 216 | 12.5 |
