5.2.1.3 Humidity

Each day, when determining the weather conditions, the humidity level is determined by rolling 3D (the humidity roll), adjusting for the season, terrain type, etc. and consulting the following table:

Adjusted humidity roll result	Resulting humidity level	Resulting humidity/precipitation
4 or less	0	Arid
6-9	1	Dry
10-13	2	Humid
14-15	3	Misty/showery (or freezing fog*)
16-17	4	Gentle rain/ drizzle (or gentle snowfall*)
18-19	5	Strong rain (or heavy snowfall*)
20 or more	6	Downpour (or blizzard*)

* applies if temperature level is icy or ultra-cold.

Modifiers to the humidity roll

There are significant modifiers to the humidity roll for:

the altitude (the higher you are the greater the chance of precipitation);
the terrain type (forests require a certain level of rain to grow, deserts are by nature arid, etc.);
the season (a region may have a seasonal weather pattern, with a pronounced wet season);
how close the area is to the sea (sea areas tend to be more humid than land-locked areas); and
the wind direction and strength (a strong wind from the sea increases the humidity, while one from the land reduces it).

Altitude

The altitude affects the humidity roll, with a modifier of +1 per 500 metres of altitude.

Terrain type/season

The terrain type and season affects the humidity roll as follows:

Terrain type	Modifier to humidity roll (normal)	Modifier to humidity roll (wet season)
At sea or on a large body of water	+3	+5
Rainforest (tropical jungle or temperate rainforest)	+2	+5
Other forests (broadleaf or coniferous)	+1	+3
Plains and grassland (including some mountains, hills and tundra)	+0	+3
Scrub and semi-arid wasteland (including some mountains)	-2	+3
Arid desert	-4	+4

Not all areas will have a wet season, in which case the normal column should be used.

Proximity to sea and wind direction/strength

The proximity to the sea and the wind direction and wind strength also affect the humidity roll result, as follows:

Location and wind direction	Impact on humidity roll
Continental areas (more than 300 kilometres from the sea)	Deduct wind strength from humidity roll result
Coastal areas (within 300 kilometres of the sea) when wind is from inland	Deduct wind strength from humidity roll result
Coastal areas (within 300 kilometres of the sea) when wind is from the sea	Add wind strength to humidity roll result
At sea	Add wind strength to humidity roll result