This line chart shows hourly temperature readings in San Francisco over one week in March 2015, with time on the x-axis and temperature in degrees on the y-axis. The visualization uses D3 v7’s `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` with `curveBasis` to render a smooth path. Data is loaded from a CSV file using `csv`, parsed into JavaScript `Date` objects and numbers, then drawn as an SVG with custom-styled axes and gridlines. The maroon line plot includes a title and axis labels.