This visualization shows temperature readings over a week in San Francisco, plotted as a smooth line chart with circular markers for each data point. The chart uses a time-scaled x-axis and linear y-axis, with day-of-week labels for the time axis. Built with React and D3 v5, the visualization leverages `scaleTime`, `scaleLinear`, `line` with `curveNatural`, and renders to SVG. Data is loaded from a CSV file using `d3.csv` and parsed into temperature values and timestamps. Tooltips on the circles display the day of each observation.