This scatterplot displays time-series data of temperature readings in San Francisco, plotting each observation as a circle against a time axis. The visualization uses `d3.scaleTime` for the x-axis and `d3.scaleLinear` for the y-axis, with SVG circles rendered via D3’s data join. Axes are drawn using `d3.axisBottom` and `d3.axisLeft`, with gridlines and labeled margins. The data comes from the Data Canvas - Sense Your City project, loaded as CSV and parsed into Date and numeric values.