This is an extremely common occurrence in California. The tombstones soak up water from the sprinklers or rain and then it evaporates at night. This is due to a combination of heat sources, including necrosol, which is the soil surrounding coffins because decay = heat.
I'm only commenting because the top answer is an OPINION that couldn't be further from the truth. I hope that person educated themselves a bit in the past 14 years.
There should be no extra influence of fog in cemeteries, it should be the same as the area around the cemetery, people in writing and film making add fog to cemeteries for effect. Around here the fog is the same in the cemetery as around it
evaporation
alcohol is basicall condensation it causes fog just like hot and or cold water
Brain fog is when your mind feels like a veil of fog has been placed around you, its hard to concentrate or think. There are 5 causes for brain fog. The causes include stress, chronic fatigue syndrome and fibromyalgia, nutrient deficiencies, depression, and fatigue.
boredom
Zombies generally come from graveyards as their corpses become reanimated. And as we all know, cemeteries are always covered in a thick coating of fog at night. So it is hard to say as all zombies eventually come out from a fog-covered graveyard at some point.
i won't say it
Condensation of water vapour.
Your breath.
bigfoot is real
fog or smog
H2O nearing dew point by radiative process causes radiation fog . Advection of warm air over cold surface makes Avection fog
Fog frequently forms in mountainous regions due to air being forced upwards by the mountains themselves. This causes the air to cool and condense its moisture into fog and clouds. This is called orographic fog.