system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can it be “too cold” to snow?
gpt
Cold air has a harder time holding moisture than warmer air.  If the air is too dry, it might be snowing higher in the atmosphere, but it evaporates before reaching grounds levels.  Evaporate is the wrong technical term for snow turning into a gas, but it's close enough.