system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If clouds are water vapor, how are there clouds in the arctic? Wouldn't all clouds just freeze almost immediately?
gpt
A cloud is made of droplets which condense out from water that's "dissolved" in the air (water vapour) into a visible form of clouds. Clouds that are higher in the atmosphere or that are found in already-cold climates are made of ice crystals. 

Even on hot sunny days sometimes, and depending on where you live, if you look up and see "wispy" clouds, those ones are tiny ice crystals. In warmer climates you see them at the very top of massive thunderclouds as well, where water is pushed up into thinner and colder layers by the rising action within the growing cloud (which also explains hail).

As to why clouds even form in the arctic when it's below freezing, that's because colder air can hold less invisible water than warmer air. When air that contains some water vapour chills down, such as if a wind moves moist air into a colder place or an updraft pushes warm moist air at the earth's surface upwards, it'll condense out just like other clouds do, forming ice crystals rather than water droplets.