This scatterplot visualizes daily mean temperatures in San Francisco over time, with each circle representing a day’s temperature plotted against its date. The chart uses D3 v5’s `scaleTime` and `scaleLinear` to map axes, `extent` for domain calculation, and SVG circles with an opacity effect. Data is loaded from a CSV file using `d3.csv`, and axes are rendered with `axisBottom` and `axisLeft`, including custom labels and grid lines.