A wind rose is a circular diagram that shows the distribution of wind direction and wind speed at a particular location over a specific period of time. Each spoke represents a compass direction, and the length of each spoke indicates the frequency or magnitude of wind from that direction. Different colors typically represent different wind speed ranges, making it easy to identify patterns at a glance.

Wind rose charts are invaluable for understanding wind patterns in your location or region. They help professionals and researchers quickly identify dominant wind directions and typical wind speeds, which is essential for applications ranging from weather forecasting to wind farm planning.

This tool uses meteorological convention: the direction value represents where the wind comes from. For example, a value of 90° means the wind comes from the east (eastward). You can switch to "To" mode in the settings panel, which reverses this — useful if your dataset uses the opposite convention. In that case, you may also need to add 180° to each value.

You can choose between 4 directions (N, E, S, W), 8 directions (N, NE, E, SE, S, SW, W, NW), or 16 directions (N, NNE, NE, ENE, ...). The more directions you choose, the more granular your wind rose will be. However, for smaller datasets, fewer directions often produce a cleaner and more readable chart.

Yes. Click the 🎨 button to choose from several Plotly and D3 color scales: Plotly, D3, G10, T10, and Alphabet. Each scale is designed for distinct categorical data and works well for distinguishing speed bins in your wind rose chart.

Yes, this tool is completely free and open source. It runs entirely in your browser — your data is never uploaded to any server. You can download the generated chart as a PNG image using the Plotly controls.

Yes. The tool is responsive and works on both desktop and mobile devices. However, for the best experience when working with larger CSV files, a desktop or laptop is recommended.