A scatterplot displays temperature readings in San Francisco over one week, with time on the x-axis and degrees Celsius on the y-axis. Each circle represents a single data point. The visualization uses D3 v5 with SVG rendering, employing `scaleTime`, `scaleLinear`, `axisBottom`, and `axisLeft` to construct the axes and plot. Data is loaded from a CSV file via `d3.csv`, with timestamps parsed as dates and temperatures as numbers. The code creates grid lines through tick sizing and includes axis labels and a title.