This line chart displays one week of temperature data in degrees Celsius for cities worldwide, sourced from Data Canvas - Sense Your City. The visualization uses d3.scaleTime for the x-axis, d3.scaleLinear for the y-axis, and d3.scaleOrdinal with a category10 color scheme to distinguish each city as a separate line. Rendering with SVG, the code employs d3.line with curveBasis for smooth paths, d3.nest to group data by city, and a custom colorLegend function. A small multiple of circles on the legend indicates which city corresponds to which colored line.