A line chart displays temperature readings over a week in San Francisco, using a smooth natural curve to connect hourly data points. The visualization loads CSV data via `d3.csv`, maps timestamps with `scaleTime` and temperatures with `scaleLinear`, and renders axes and marks as SVG elements through React components. The chart shows the full week on the x-axis with abbreviated weekday labels and temperature on the y-axis, enabling a clear view of daily temperature fluctuations across the period.