This area chart shows San Francisco temperatures over time, with a blue gradient fill beneath a smoothed curve. The visualization loads temperature data from a CSV file and renders it as an SVG using D3 v5. The code applies `d3.scaleTime` for the x-axis, `d3.scaleLinear` for the y-axis, and `d3.area` with `curveBasis` to generate the smooth area path. Grid lines are drawn via axis tick marks, with titles for the chart and both axes included.