A line chart displays one week of temperature readings across multiple global cities, with each city represented by a distinct colored line. The visualization uses d3.scaleTime and d3.scaleLinear for axes, d3.nest for grouping data by city, and d3.line with curveBasis for smooth paths. A d3.scaleOrdinal with schemeCategory10 handles color encoding, while an interactive color legend explains city assignments. The chart includes axis labels, a title, and a legend, rendering data from the Data Canvas - Sense Your City dataset.