Weather Table
| 1d20 | Temperature | Wind | Precipitation |
|---|---|---|---|
| 1-12 | Normal | None | None |
| 13-16 | 1d4 x 5° colder | Light | Light rain |
| 17-20 | 1d4 x 5° hotter | Strong | Heavy rain |
Extreme Cold
When the temperature is -20°C or lower, a creature exposed to the extreme cold must succeed on a DC 10 Constitution saving throw at the end of each hour or gain 1 Exhaustion level. Creatures that have Resistance or Immunity to Cold damage automatically succeed on the save.
Extreme Heat
When the temperature is 40°C or higher, a creature exposed to the extreme heat and without access to drinkable water must succeed on a Constitution saving throw at the end of each hour or gain 1 Exhaustion level. The DC is 5 for the first hour and increases by 1 for each additional hour. Creatures wearing Medium or Heavy armor have Disadvantage on the save. Creatures that have Resistance or Immunity to Fire damage automatically succeed on the save.
Strong Wind
Strong wind imposes Disadvantage on ranged attack rolls with weapons. It also extinguishes open flames and disperses fog. A flying creature in a strong wind must land at the end of its turn or fall.
A strong wind in a desert can create a sandstorm that imposes Disadvantage on Wisdom (Perception) checks.
Heavy Precipitation
Everything within an area of heavy rain or heavy snowfall is Lightly Obscured, and creatures in the area have Disadvantage on all Wisdom (Perception) checks. Heavy rain also extinguishes open flames.