San Gallan Wind Statistics, Summer averages since 2006
The rose diagram describes how frequently and how strongly the wind blows from different directions through a typical southern hemisphere summer. The biggest spokes point in the directions the wind most commonly blows from and the shade of blue suggests the strength, with the darkest shade of blue showing the strongest winds. It is based on 5048 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to San Gallan, located 20 km away (12 miles). There are insufficient recording stations world wide to use actual wind data. No doubt some coastal places have very localized wind effects that would not be predicted by NWW3.
According to the model, the most common wind at San Gallan blows from the SSW. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at San Gallan. On the other hand, dominant spokes show favoured directions, and the more dark blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average southern hemisphere summer, the model suggests that winds are light enough for the sea to be glassy (the lightest shade of blue) about 3% of the time (3 days each southern hemisphere summer) and blows offshore just 3% of the time (3 days in an average southern hemisphere summer). During a typical southern hemisphere summer winds exceeding >40kph (25mph) are not expected, but 2 have winds on the range 30-40 (19-25) at San Gallan
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.