This visualization displays monthly global land surface temperatures from 1753 to 2015, with each cell’s color representing variance from the 1951–1980 average. A hover tooltip reveals the exact month, year, and temperature anomaly. The SVG chart uses d3.scaleTime for the x-axis, d3.scaleQuantize for color mapping, and d3.json to load the FreeCodeCamp dataset. Animated transitions appear only in the tooltip’s opacity changes, while a gradient legend is built with d3.scaleLinear and linearGradient stops.