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This mod adds one item, the Biome Thermometer. When you right-click on the ground with it, it will show you the biome name you are in, the biome temperature, and the biome humidity (also called the rainfall value). It's worth noting that it displays the biome info for the biome YOU are in, not for the biome of whichever block you click on.
!Thermometer in action
!Crafting recipe

Adds a thermometer which displays the temp and humidity levels