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Castlerock ratings
Quality on a good day: 3.0
Consistency of Surf: 4.0
Difficulty Level: 1.0
Crowds: 4.0

Overall: 3.3

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Surf Report Feed

Castlerock Swell Statistics, All Year: Surf with Light or Offshore Winds

The rose diagram shows only the swells directed at Castlerock that coincided with light winds or offshore conditions over a normal year and is based upon 33204 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. Green and yellow illustrate increasing swell sizes and highest swells greater than >3m (>10ft) are shown in red. In each graph, the area of any colour is proportional to how often that size swell happens.

The diagram indicates that the dominant swell direction, shown by the longest spokes, was WNW, whereas the the dominant wind blows from the SW. 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 39% of the time, equivalent to 142 days. Expect open water swells to exceed >3m (>10ft) 3% of the time (11 days). Taking into account the fraction of these swells that coincided with predicted offshore winds, and given the fact that Castlerock is exposed to open water swells, we estimate that clean surf can be found at Castlerock about 39% of the time and that surf is messed up by onshore wind 49% of the time. This is means that we expect 321 days with waves in a typical year, of which 142 days should be clean enough to surf.

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.