A moment after Aki was sent flying away, Dyon appeared with Ri still in his arms below a large snow-white palace. Obviously, this was Snow Palace.
The weather in most areas of the Epistemic Tower Inner world was usually calm and sunny, aside from the night time, of course. There were, of course, areas used for training that contained abyssal cores with drastically different weather patterns, but this was the truth for the most part.
However, in the cases of places like the Snow Palace that owned a relatively large area unto itself, they were able to place down formations that bent the weather to their whims. So, in the few hundred acres owned by the Snow Clan, there was a winter wonderland.
This Palace was actually Ri's personal residence. Other members of the Snow Clan were placed in the various homes in the surroundings, but this relatively large piece of land was left to Ri alone as a sign of good will from the Snow Clan.