A line chart displays one week of temperature data in San Francisco, with time on the x-axis and degrees Celsius on the y-axis. The data comes from Data Canvas – Sense Your City. The visualization uses d3.csv to load the data, then applies d3.scaleTime and d3.scaleLinear for the axes, with axisBottom and axisLeft generating the tick marks. A d3.line path with curveBasis connects the points smoothly, styled with a maroon stroke in an SVG canvas.