This visualization displays a line plot of temperature readings over time, with a dark, readable style and tooltip interactions. The chart uses the Vega-Lite API to declare the mark and encodings, while D3’s `csv` function loads the dataset from a GitHub gist. The `index.js` file registers the Vega-Lite API with Vega and enables tooltips, then renders the chart into the page’s body with automatic width and height fitting. The configuration adjusts axis label sizes and colors for clearer presentation.