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Johanna ratings
Quality on a good day: 3.5
Consistency of Surf: 5.0
Difficulty Level: 3.5
Crowds: 3.5
Accommodation: 4.0

Overall: 3.4

See all 18 ratings

Based on 2 votes. Vote


Surf Report Feed

Johanna Swell Statistics, July: Surf with Light or Offshore Winds

This image shows only the swells directed at Johanna that coincided with light winds or offshore conditions through a typical July. It is based on 2976 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours represent increasing wave sizes. Very small swells of less than 0.5m (1.5 feet) high are shown in blue. Green and yellow illustrate increasing swell sizes and red shows largest swells greater than >3m (>10ft). In either graph, the area of any colour is proportional to how frequently that size swell happens.

The diagram suggests that the most common swell direction, shown by the largest spokes, was SW, whereas the the most common wind blows from the WNW. 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 30% of the time, equivalent to 9 days. Open water swells exceeding >3m (>10ft) only arise 2% of the time in a typical July, equivalent to just one day but 19% of the time we expect swell in the range 2-3m (6.5-10ft) 19%, equivalent to (6 days). Taking into account the fraction of these swells that coincided with predicted offshore winds, and given the fact that Johanna is exposed to open water swells, we think that that clean surf can be found at Johanna about 30% of the time and that surf is messed up by onshore wind 46% of the time. This is means that we expect 24 days with waves in a typical July, of which 9 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.