This line chart visualizes Seattle weather trends in 2016, showing maximum, mean, and minimum temperatures over the first 200 days using three colored lines. The chart combines a multi-series line graph with overlaid bars representing the mean temperature. Built with D3 v7, the code loads CSV data and uses `d3.line()`, `d3.scaleLinear()`, and `d3.axisBottom()` to render the SVG visualization, including axes, labels, and a legend for temperature series.