A line chart displays temperature readings over the course of a week in San Francisco, using a smooth curved path to emphasize trends. The visualization employs React to render SVG elements, with D3 v5 scales (scaleTime and scaleLinear) mapping timestamps and temperatures, while reusable axis components generate tick marks. Data is loaded asynchronously via d3.csv from an external URL, and the brush-free chart includes hover tooltips on circles for precise time values.