The rose diagram shows only the swells directed at San Pedrito (Todos Santos) that coincided with light winds or offshore conditions over a normal northern hemisphere summer. It is based on 5066 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 often that size swell was forecast.
The diagram indicates that the most common swell direction, shown by the largest spokes, was SSW, whereas the the most common wind blows from the W. 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 19% of the time, equivalent to 17 days. Open sea swells exceeding >3m (>10ft) are unlikely to occur in a normal northern hemisphere summer but 9% of the time you can expect swell in the range 1.3-2m (4-6.5ft) 9%, equivalent to (8 days). Taking into account the ratio of these swells that coincided with expected offshore winds, and given the fact that San Pedrito (Todos Santos) is exposed to open water swells, we calculate that clean surf can be found at San Pedrito (Todos Santos) about 19% of the time and that surf is blown out by onshore wind 63% of the time. This is means that we expect 75 days with waves in a typical northern hemisphere summer, of which 17 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.