TaN: 1.12.2-3.1.0.73
Forge: 2615

Caused by: java.lang.RuntimeException: No method instruction node found matching net/minecraft/world/biome/Biome getTemperature (Lnet/minecraft/util/math/BlockPos;)F

The transformer is looking for "getTemperature" inside of addRainParticles() when it should be looking for "getFloatTemperature" (if I am understanding the intent of the transformer).

I ran into this issue as well, you need to update your MCP mappings, TaN uses snapshot_20171220

Cries I hate moving snapshots... Thanks for the info - I will take a look.

EDIT: I moved forward to the snapshot @mallrat208 mentioned and it is working. Closing.