A line plot displays San Francisco's temperature readings over one week, with blue circles marking each data point along the time-based x-axis and temperature-based y-axis. The visualization loads CSV data from an external VizHub dataset, parsing timestamps and numeric temperatures before rendering. Built with D3 v5, the code uses scaleTime, scaleLinear, axisBottom, axisLeft, and extent APIs to construct the chart, including grid lines, axis labels, and a title, all rendered as SVG elements.