This line chart displays temperature readings in San Francisco over time, with a smooth curve and labeled axes. The visualization uses D3 v5 APIs including `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` with `curveBasis` to generate the SVG path. Data comes from a CSV file loaded via `d3.csv`, where timestamps are parsed as dates and temperatures as numbers. The chart includes a title, rotated y-axis label, and grid lines styled through CSS classes on the SVG elements.