This line chart visualizes temperature fluctuations in San Francisco over a week, using a smooth curve to connect data points across time. The horizontal axis represents time, while the vertical axis shows temperature, with grid lines and labeled axes for readability. Built with D3 v6, the code uses `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` with `curveBasis` to generate the SVG path. Data is loaded from a CSV file and parsed into JavaScript `Date` objects, and grid lines are created via tick marks on both axes.