This line chart visualizes a week of temperature data in San Francisco, with multiple lines representing different cities and a color legend identifying each one. The data comes from the Data Canvas - Sense Your City dataset. Built with D3 v5, the visualization uses `d3.line` with `curveBasis` for smooth paths, `d3.scaleTime` and `d3.scaleLinear` for axes, and `d3.scaleOrdinal` with `schemeCategory10` for colors. Axes include gridlines via `tickSize`, and the chart is rendered as SVG with a title and axis labels.