This interactive line chart displays daily temperature measurements for San Francisco across December 2015, with dropdown menus allowing selection of the x-axis, y-axis, and chart type (line or area). Built with React and D3 v5, it uses `d3.scaleTime`, `d3.scaleLinear`, `d3.line`, `d3.axisBottom`, and `d3.axisLeft` to render SVG paths with a smooth curve. A hovering tooltip, implemented with `d3.mouse` and `d3.timeFormat`, reports precise values for any point. Data comes from the provided CSV file.