This example visualizes temperature readings over time as a smooth line chart with overlaid scatter points, using a time-based x-axis and linear y-axis. The visualization loads data from a CSV file containing weekly San Francisco temperatures, parsed via d3.csv. Built with React and rendered as SVG, the chart employs d3.scaleTime, d3.scaleLinear, and d3.line with curveNatural for the curved path, while each data point is drawn as a circle with a tooltip showing the day of the week.