Even if there's no flash flood, the mountainous terrain is winding, and the dirt paths are muddy. Once it rains too much, even the roads become difficult to walk.
And summer is too hot; neither wild beasts nor fierce beasts like to move much. Humans traveling and hunting in such temperatures and environments is also very unsuitable.
As for winter, not only is food scarce, with prey hiding for the season, but phenomena like heavy snow sealing the mountains are more likely to occur.
After autumn, the climate is dry, and vine plants wither. Some wild gourds and seeds of plants have already borne fruit.
The abundance of mature food attracts many animals to eat, store fat, and even stockpile food for entering winter mode. And some wild beasts and fierce beasts also become active in hunting, storing energy to last through the winter.
Therefore, only this season is most suitable for entering the Outer Domain for hunting.
