# Heavy Precipitation *Environmental Hazard* Everything within an area of heavy rain or heavy snowfall is [Lightly Obscured](/3-Mechanics/CLI/variant-rules/lightly-obscured-xphb.md), and creatures in the area have [Disadvantage](/3-Mechanics/CLI/variant-rules/disadvantage-xphb.md) on all Wisdom ([Perception](/3-Mechanics/CLI/skills.md#Perception)) checks. Heavy rain also extinguishes open flames. *Source: Dungeon Master's Guide (2024) p. 69*