I'd take the moon phase in consideration for the game date. A full moon, or close to it, with few or no cloud will really improve the game, visibility wise.
I did a few overnight games, and those on the full moon where the best. You still can't see shit in the wood, but you see small shadows and reflections that get you shooting at ghosts.
Also, like goldman said, something dynamic. People get tired faster at night and if the game become dull, they will sit on their ass and talk around the fire (or light).
It's anoying when you hear the echo of all those dead players, yapping in the distant and breaking to mood of the stalk.
Vérificateur d'âge: Terrebonne