A smooth, filled area chart visualizes a week of hourly temperature readings in San Francisco, mapping time on the x-axis and temperature on the y-axis. The SVG is rendered using D3 v5, with `scaleTime` and `scaleLinear` defining the axes and `area` with `curveBasis` generating the curved fill. Axis labels and a title are added, while data loads from a CSV via `d3.csv`.