Minecraft wiki entry for Best_biomes_for_homes, associated text: The cold temperature means any exposed water in this biome will freeze without a nearby heat source, making farming difficult without light sources.
Cows, pigs, and sheep only spawn as part of village generation.
Polar bears spawn fairly frequently and will attack when approached if there is a nearby cub (otherwise will only attack when hit).
When it snows, snow layers will be created on any flat, solid blocks, which can be a nuisance.
Top snow can stack during snowfall.‌[Bedrock Edition only]
During the night, strays spawn on the surface. Unlike skeletons, strays shoot arrows of Slowness, which makes it harder to either advance or run away.
Pillager outposts can generate.