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Johnshaven ratings
Quality on a good day: 4.0
Consistency of Surf: 2.0
Difficulty Level: 3.0
Crowds: 4.0

Overall: 3.5

See all 18 ratings

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Surf Report Feed

Johnshaven Swell Statistics, June: Surf with Light or Offshore Winds

This image shows only the swells directed at Johnshaven that coincided with light winds or offshore conditions through a typical June. It is based on 2785 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 largest swells greater than >3m (>10ft) are shown in red. In each graph, the area of any colour is proportional to how commonly that size swell happens.

The diagram implies that the prevailing swell direction, shown by the longest spokes, was SSE, whereas the the most common wind blows from the S. 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 0 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal June. Taking into account the fraction of these swells that coincided with forecast offshore winds, and given the fact that Johnshaven is slightly protected from open water swells, we calculate that clean surf can be found at Johnshaven about 0.4% of the time and that surf is blown out by onshore wind 5% of the time. This is means that we expect 2 days with waves in a typical June, of which 0 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.