This line chart visualizes temperature readings in San Francisco over a week, with time on the x-axis and temperature on the y-axis. It renders as an SVG using D3 v5, employing `scaleTime`, `scaleLinear`, `d3.line`, and `axisBottom`/`axisLeft` to draw the path and axes. The data comes from a CSV file loaded via `d3.csv`, with timestamps parsed as dates and temperatures as numbers. Grid lines are created by setting negative tick sizes, and axis labels are styled via CSS classes.