This line chart displays weekly temperature readings across multiple cities, with each colored line representing a different city’s production season. It uses D3 v5 with nested data grouping via `d3.nest()` and renders SVG paths generated by `d3.line()` with a basis curve. The chart includes axes from `d3.axisBottom` and `d3.axisLeft`, and a custom color legend built with `scaleOrdinal` and `schemeCategory10`. Data comes from the Data Canvas - Sense Your City dataset, loaded as CSV.