This line chart shows temperature measurements in San Francisco over time, with a red curve plotted against labeled time and temperature axes. The visualization uses D3 v5's `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` with `curveBasis` to generate a smooth SVG path. Data is loaded as CSV from a GitHub gist, with timestamps parsed as dates and temperatures as numbers. Grid lines and rotated axis labels enhance readability, while the title and axis labels are styled via CSS.