This line chart visualizes temperature readings in San Francisco over time, with time on the x-axis and temperature on the y-axis. The chart uses D3 v5 APIs including `scaleTime`, `scaleLinear`, `line` with `curveBasis`, and `axisBottom`/`axisLeft` to render the axes and smooth curve. Data is loaded via `csv` from a VizHub-hosted dataset, and the rendering uses SVG elements. The maroon line is drawn with a `path` element, with gridlines and axis labels styled in CSS.