A scatter plot displays temperature readings over time from the San Francisco data set, with each point representing a timestamp and its corresponding temperature. The visualization uses d3.scaleTime for the x-axis and d3.scaleLinear for the y-axis, rendering circles in SVG with a fixed radius and semi-transparent steelblue fill. Axis labels and a title are added using d3.axisBottom and d3.axisLeft, with grid lines generated through tick sizing. The code loads the CSV data via d3.csv, parses the temperature and timestamp fields, and appends the plot elements dynamically.