Six biomes, and two numbers on each of them decide how hard it hits: the loot stage modifier and the game stage modifier. The pine forest adds nothing to either. The burnt forest adds 0.5 to both, the desert 1, the snow 1.5 loot and 3 game stage, and the wasteland 2 and 5, which is why a wasteland POI at the same day count fields worse zombies and better loot than the same POI in the forest.

Each biome also runs its own weather table and its own hazard buff: heat in the desert, cold in the snow, the radiation and dust of the wasteland. The spawn lists below are the game's own, split day and night.