This visualization displays a week of temperature measurements in San Francisco, plotting each observation as a circle along a time-based x-axis and linear temperature y-axis. The data is loaded from a CSV file using `d3.csv` and rendered as SVG circles. The code uses `d3.scaleTime`, `d3.scaleLinear`, and axis generators (`d3.axisBottom`, `d3.axisLeft`) with grid lines, alongside a rotated y-axis label and a title, all styled via external CSS.