Would it be possible that as you progress through the levels, before you start taking effects you see a more visible effect.

For example, your character begins to shake as it gets cold. The shaking doesn't need to increase in frequency.

This would be a cool effect, plus it would help players with a more visible indicator when they've wandered into dangerous territory.

Added a shaking effect with 1c39445
Might add an environment indication somehow too since this will only apply when the player temperature is pretty low