Temperature is roughly how fast molecules are moving, vibrating etc. And the impact of low/higher temperature are really how fast molecules are knocking you. For an ideal gas, temperature is proportional to the square of the velocity.
So at room temperature (300K), the speed of the molecules is roughly 300^0.5 = 17.3 in some arbitrary units. If you drop down to freezing point of water, (273K), speed is 16.5. And that is starting to get cold. -40C (as cold as most humans will experience) is 15.3. So each drop of 1 in speed is pretty drastic.
At 100K, the speed is 10, or 7 drops from 17. That should be a lot colder than room temperature. But not cold enough. Most of the speed is still there, we haven't even cut it by half. It's the next few 1/3rd cuts of the temperature that will start to get us closer to zero speed.
Humans should experience something within -50°C to 50°C for most, if not their entire lives, but that's just 223K to 323K, maybe that's the range we can understand as a warmth difference, so getting to that temperature might feel like that super wide, in human warmth terms, drop in temperature twice, which still feels unimaginably cold.
Warm-blooded mammals of course have a reference point based on their thermal homeostatic capabilities (ability to maintain body temperature). “Warm” and “cold” is in relation to that.
The Stefan-Boltzman relation says power scales with the fourth power of temperature. So 1/3 absolute temperature would be 1/81 the inbound radiative energy. If you are getting 800W inbound at room temp, you would get 10W inbound at 100K (=300K/3).