A scatter plot displays temperature readings over time in San Francisco, using steelblue circles on a Cartesian grid. The visualization renders as an SVG, with a time-scaled x-axis and a linear y-axis for temperature, both labeled with custom tick marks and gridlines. The code leverages d3's `scaleTime`, `scaleLinear`, `axisBottom`, and `axisLeft` to construct the chart, loading data from a CSV file hosted on vizhub. A title and axis labels are positioned within the margins, and the plot uses a clean, sans-serif style.