This line chart visualizes temperature readings over time, with a smooth curved line and circular markers at each data point. The visualization uses D3’s `scaleTime` and `scaleLinear` for axes, `line()` with `curveBasis` for the path, and `axisBottom`/`axisLeft` for ticks. Data from a CSV of San Francisco temperatures is loaded via `csv` and parsed into dates and numbers. The SVG rendering includes gridlines, axis labels, and a title, with the line styled in steelblue.