This D3.js v7 visualization combines a bar chart of daily maximum temperatures with a monotone-smoothed line chart of mean temperatures from a 1948 weather dataset. Orange bars encode the maximum temperature values against the left y-axis, while the blue line uses the right y-axis for the mean temperature readings. The chart renders as an SVG using `d3.select`, `d3.scaleBand`, `d3.scaleLinear`, `d3.axisBottom`, `d3.axisLeft`, `d3.axisRight`, and `d3.line` with `d3.curveMonotoneX`, displaying years along the bottom axis.