This example visualizes temperature in San Francisco as an area chart over time, with circular data points layered on the filled path. Built with D3 v5, it loads CSV data, parses timestamps and numeric temperatures, and maps them to time and linear scales. The visualization uses `scaleTime`, `scaleLinear`, `area`, and `curveBasis` to generate the smooth area, while `axisLeft` and `axisBottom` render labeled axes with customized grid lines.