This example visualizes a time series of weekly temperature readings from San Francisco, plotting temperature against time as a scatter plot overlaid with a smooth connecting line. The chart uses React to render SVG elements, with axes and marks built as reusable components. Scales are created using d3.scaleTime and d3.scaleLinear, while the line path is generated with d3.line and the curveNatural interpolator. Data is loaded asynchronously via d3.csv, and each point includes a tooltip showing the timestamp.