This chart visualizes daily average temperatures for New York, San Francisco, and Austin over several months using a multi-series line chart. Three colored lines, one per city, trace temperature trends over time, with hovering over a line highlighting it and dimming others; clicking a line toggles its visibility. The visualization also includes an optional overlay of Voronoi regions to aid in selecting nearby data points. Built with D3.js v7 and the d3-voronoi extension, it renders as an animated SVG.