This line chart visualizes weekly temperature variations in San Francisco, with time on the x-axis and temperature on the y-axis. The React app loads CSV data using D3’s `csv` utility and renders an SVG with `scaleTime` and `scaleLinear` scales. Latitude and longitude axes use custom `AxisBottom` and `AxisLeft` components, while the `Marks` component draws a smooth curve via `d3.line().curve(curveNatural)` and overlays circles with native SVG tooltips. The visualization uses teal styling for marks and a clean background, following a modular React component architecture.