The rose diagram shows how frequently and how strongly the wind blows from different directions through a typical August. The largest spokes point in the directions the wind most commonly blows from and the shade of blue indicates the strength, with the darkest shade of blue strongest. It is based on 1727 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 prevailing wind at Deauville blows from the WNW. If the rose diagram shows a close to circular outline, it means there is no strong bias in wind direction at Deauville. Converseley, dominant spokes represent favoured directions, and the more dark blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average August, the model suggests that winds are light enough for the sea to be glassy (pale blue) about 9% of the time (3 days each August) and blows offshore 13% of the time (0 days in an average August). During a typical August wind stronger than >40kph (25mph) was forecast 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.