A line chart displays hourly temperature readings for San Francisco, with time on the x-axis and temperature in degrees on the y-axis. The data includes a 24-hour cycle across several days, showing peaks in the afternoon and troughs in the early morning. The visualization uses D3 v5’s `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` with a basis curve to render the smooth path. The SVG is 950 by 450 pixels, with axis labels and a title styled via CSS.