Minimal light (from the moons and stars).
Full fog, visibility 20 feet.
Mid-forest clearings gone, moss on tree trunks, plants have normal health, normal amount of plants.
Noticeable wind, lots of lightning, rain, cool winds.
There are drizzles with a few caverns flooded, one level more rain, normal river strength for this level.
Normal tensile strength.
If plants permit there is vine-thatching over smaller gashes, crust marginally easier to remove, vine-thatchings sturdier.
Normal landscape.
Normal fauna and flora behaviour.