Aberdaron Swell Statistics, All Year: Surf with Light or Offshore Winds
The rose diagram shows only the swells directed at Aberdaron that coincided with light winds or offshore conditions through a typical year and is based upon 28031 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours show increasing wave sizes. The smallest swells, less than 0.5m (1.5 feet), high are coloured blue. Green and yellow represent increasing swell sizes and red represents the largest swells, greater than >3m (>10ft). In either graph, the area of any colour is proportional to how frequently that size swell occurs.
The diagram suggests that the prevailing swell direction, shown by the longest spokes, was WSW, whereas the the most common wind blows from the WSW. The chart at the bottom shows the same thing but without direction information. For example, swells larger than 1.5 feet (0.5m) coincided with good wind conditions 0.4% of the time, equivalent to 1 days. Open sea swells exceeding >3m (>10ft) are unlikely to happen in a normal year. Taking into account the proportion of these swells that coincided with predicted offshore winds, and given the fact that Aberdaron is slightly protected from open water swells, we estimate that clean surf can be found at Aberdaron about 0.4% of the time and that surf is spoilt by onshore wind 25% of the time. This is means that we expect 91 days with waves in a typical year, of which 1 days should be surfable.
IMPORTANT: Beta version feature! Swell heights are open water values from NWW3. There is no attempt to model near-shore effects. Coastal wave heights will generally be less, especially if the break does not have unobstructed exposure to the open ocean.