I have a script based on Percentages-- it starts at 100, and then modifies it based on several factors. So it is a little like
Start -- 100
If Cloudy - ( Start - ( Cloudy Value *25 ) )
If Raiing - ( Start - ( Raininy Value * 25 )

And so on.

Obviously we can't use these in our Scripts, but is there a way to apply them someway else? I thought of using an Ability/Perk but it did not seem to work for me...

Have a look at http://www.creationkit.com/GetCurrentWeather_-_Weather and http://www.creationkit.com/GetClassification_-_Weather. Those should help you.

what about terrain? i'm not finding anything that checks what the terrain is.

terrain?

Thank-you

What they mean is check what kind of terrain player is currently standing on. I've found no way for this yet. There's neither a way to check for the texture nor for the havokmaterial associated with it.