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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

See all 18 ratings

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Surf Report Feed

Castlerock Swell Statistics, March: Surf with Light or Offshore Winds

This image shows only the swells directed at Castlerock that coincided with light winds or offshore conditions over a normal March. It is based on 2220 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 biggest 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 was forecast.

The diagram indicates that the prevailing swell direction, shown by the longest spokes, was WNW, whereas the the prevailing 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 42% of the time, equivalent to 13 days. Expect open water swells to exceed >3m (>10ft) 5% of the time (2 days). Taking into account the proportion of these swells that coincided with forecast offshore winds, and given the fact that Castlerock is exposed to open water swells, we think that that clean surf can be found at Castlerock about 42% of the time and that surf is blown out by onshore wind 48% of the time. This is means that we expect 28 days with waves in a typical March, of which 13 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.