This example displays an area chart of city temperatures, with city names on the x-axis and temperature in degrees Celsius on the y-axis. It fetches weather data from a CSV file hosted on GitHub, parses it with `d3.csvParse`, and uses `d3.scaleBand`, `d3.scaleLinear`, and `d3.area` to construct the filled path. The SVG axes, labels, and tick rotations are generated using `d3.axisBottom` and `d3.axisLeft`.