Regular weather doesn't have much effect on characters other than for flavor. Extreme weather does affect characters.
Poor sleep. The CON saving throw for sleep increases by 5
Slow travel. Travel speed is reduced by 1/3
Difficult navigation. Day's navigation checks are at disadvantage
Each morning of a travel day, roll a d20. On a result of 1, extreme weather results. Next roll for the actual extreme weather type below.
Extreme Weather: Spring & Summer
d4 | Extreme Weather |
|---|---|
1 | Gale force winds |
2 | Thunderstorm |
3 | Flash flooding |
4 | Heat wave |
Extreme Weather: Fall & Winter
d4 | Extreme Weather |
|---|---|
1 | Blizzard |
2 | Freezing rain |
3 | Ice storm |
4 | Cold snap |