This heatmap shows monthly values across five years, with a white-to-orange color scale indicating magnitude from 0 to 2. Rendering as SVG, the visualization uses d3.scaleBand for month and year axes, d3.scaleLinear for color encoding, and d3.csv to load the heatmap.csv data. A tooltip appears on hover, displaying the exact cell value via mouseover, mousemove, and mouseleave handlers.