This example visualizes temperature over time in San Francisco, using a line chart to show how readings fluctuate throughout the week. The chart is built with React and renders as an SVG, using d3. `scaleTime` and `scaleLinear` handle the axes, while `line` with `curveNatural` draws a smooth path through the data points. The underlying CSV data is loaded asynchronously via `useData`, which parses timestamps and numeric temperature values.