D3.js challenging - Level 1
This example visualizes daily temperature records in a calendar-style heatmap, with the x-axis representing years and the y-axis representing months. Each cell encodes temperature values through color, and the visualization includes axis labels, gridlines, and a legend for color mapping. Built with D3.js v7, it uses `d3.scaleTime` for both axes, `d3.axisBottom` and `d3.axisLeft` for ticks, and reads data from a CSV file. The code includes placeholder logic for rendering maximum and minimum temperatures and tooltip functionality, though those interactions are not fully implemented in the visible source.