Minecraft wiki entry for Tint, associated text: The adjusted temperature and adjusted rainfall values (recognized as AdjTemp and AdjRainfall in the code, respectively) are used when determining the biome color to select from the colormap. Treating the bottom-right corner of the colormap as Temperature = 0.0 and Rainfall = 0.0, the adjusted temperature increases to 1.0 along the X-axis, and the adjusted rainfall increases to 1.0 along the Y-axis. The values used to retrieve the colors are computed as follows: