This bar chart visualizes average annual rainfall in millimeters for over 100 cities worldwide, using data loaded from an external CSV file. Each city’s rainfall value is represented by a green bar, with axes labeled and rotated city names for readability. The visualization is built with D3 v7, employing `d3.scaleBand`, `d3.scaleLinear`, and `d3.axisBottom`/`d3.axisLeft` to render the SVG chart, while mouse hover changes bar color to orange.