The rose diagram illustrates how frequently and how strongly the wind blows from different directions over a normal July. The longest spokes point in the directions the wind most commonly blows from and the shade of blue implies the strength, with dark blue strongest. It is based on 1714 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Deauville, located 16 km away (10 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 dominant wind at Deauville blows from the WNW. If the rose graph shows a fairly circular pattern, it means there is no strong bias in wind direction at Deauville. By contrast, dominant spokes show favoured directions, and the more the darkest shade of blue, the stronger the wind. Spokes point in the direction the wind blows from. During a typical July, the model suggests that winds are light enough for the sea to be glassy (light blue) about 9% of the time (3 days each July) and blows offshore 12% of the time (1 days in an average July). Over an average July wind stronger than >40kph (25mph) was expected for only a single days at Deauville
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.