This area chart visualizes temperature over time for San Francisco, using a smooth curve to show the trend with overlaid scatter points. The visualization loads CSV data via `d3.csv` and renders using D3 v5's `scaleTime`, `scaleLinear`, `axisBottom`, and `axisLeft`. The `d3.area` generator with `curveBasis` creates the filled path, while individual temperature readings appear as semi-transparent circles. The SVG output includes labeled axes, a title, and gridlines, with styling applied via CSS classes.