Castle Island Wind Stats

The rose diagram describes how commonly and how strongly the wind blows from different directions through a typical October. The longest 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 3471 NWW3 forecasts of wind since since 2006, at 3hr intervals, for the closest NWW3 model node to Castle Island, located 24 km away (15 miles). There are not enough recording stations world wide to use actual wind data. Invevitably some coastal places have very localized wind effects that would not be predicted by NWW3. According to the model, the dominant wind at Castle Island blows from the SW. If the rose plot shows a nearly round shape, it means there is no strong bias in wind direction at Castle Island. By contrast, dominant spokes illustrate favoured directions, and the more the darkest shade of blue, the stronger the wind. Spokes point in the direction the wind blows from. Over an average October, the model suggests that winds are light enough for the sea to be glassy (the lightest shade of blue) about 0.7% of the time (0 days each October) and blows offshore just 4% of the time (1 days in an average October). In a typical October wind stronger than >40kph (25mph) was predicted for only a single days at Castle Island

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