This area chart visualizes Chicago’s average daily temperatures for March, using a smooth curved line and a semi-transparent green filled region beneath it to emphasize temperature trends over the month. The chart is built with D3 v5, employing `scaleTime` for the date axis, `scaleLinear` for the temperature axis, and both `line` and `area` generators with `curveBasis` for the curved path. The x-axis uses a custom month format, while the y-axis applies a compact number formatter, with grid lines and labeled axes styled via CSS. Data is loaded from a CSV file containing day–temperature pairs.