This visualization shows the evolution of temperature in San Francisco over time, with a smooth area chart rendered as an SVG. It uses d3.csv to load the data, d3.scaleTime and d3.scaleLinear for the axes, and d3.area with curveBasis to generate the filled path. The chart includes labeled axes, a title, and a clean grid created via tick lines. The code imports specific D3 v5 modules, such as select, extent, and axisBottom, and applies the d3.axisLeft and d3.axisBottom APIs.