Biome Temperature Error

I made a ranged weapon, that, when the projectile hits a block, it spawns fire. But in order for the fire to spawn, the biome temp must be greater than or equal to 2 (desert,nether). But the procedure doesn't work, instead it always summons the fire regardless of the temp, almost like the game is just ignoring my procedure. But when i do less than or equal to .15. The game obeys that... im so confused...