Finding or Building Shelter in the Wilderness

Characters do not normally have to roll to pitch a tent or set up normal camping gear, but adventurers often have to improvise shelter without ideal equipment.
Depending on where one is and what time of year it is, humanoids needs shelter from heat, cold, fauna, and/or getting wet. The more severe the conditions are, the more durable shelter is required. The more arid or rugged an area is, the less materials you have to make shelter with.

Scenario Base Difficulty

Rural countryside, summer 3
Tropical forest, typical 5
Temperate forest, summer 4
Temperate forest, winter 6
Rural countryside, winter 6
Mountains, warm 7
Tropical forest, monsoon season 7
Tundra, summer 7
Savannah 8
Tundra, winter 9
Mountains, cold 9
Desert with hot and cold cycle 9