This line chart visualizes a week of temperature readings in San Francisco, with time on the x-axis and temperature on the y-axis. The chart renders as an SVG, using d3’s `scaleTime` and `scaleLinear` for axes, `line` with `curveBasis` for the smoothed path, and `axisBottom` and `axisLeft` with grid ticks. The data comes from a CSV file hosted at a URL, parsed with d3’s `csv` function, and styled via custom CSS classes for the title, axis labels, and maroon line.