This line chart visualizes weekly temperature data for San Francisco, showing the trend of temperature values over time. The chart uses a single line mark with a fixed size and opacity, encoding time on the x-axis and quantitative temperature on the y-axis, both with zero scale suppression. Built with the Vega-Lite API, the visualization leverages D3’s `csv` function to load data from a GitHub gist and renders interactively with tooltips via `vega-tooltip`. The appearance is customized through a config object that removes axis domains and adjusts font colors and sizes for readability.