system
Given the following post, respond as if you're commenting on Reddit:
human
Someone told me it was "too cold to snow".  How?

This was only at about -2°C.  How then does the Earth have so much snowfall in extremely cold places?
gpt
The amount of moisture in the air is dependent upon its temperature, below a certain point there is too little moisture for precipitation.

There are various large stretches of the Antarctic that qualify as deserts because they have so little precipitation due to this principle. But -2 is certainly warm enough to snow.

Can anyone put a name to this principle?