Do ranged penalties from wind and rain stack?

[Gluttony]

According to the books on rain, it "Has the same effect on flames, ranged weapon attacks, and Perception checks as severe wind."

Severe wind itself gives a -4 to ranged attacks. Would the two stack, making a -8 to ranged attacks (along with the other penalties), or would it be -4?

What about rain and strong wind? -6 penaly from stacking, or does the -4 from rain trump the wind's penalties.

[cwslyclgh]

In general penalties from different sources always stack.

[Herald of the Vile]

Yes; weather like terrain penalties compound making it very difficult to your career Archers to set up effective seige lines in the midst of a hurricane which any archer worth his salt would tell you is just plain silly to have him do.
-Herald of the Vile

[magispitt]

The weather section says: "Rain reduces visibility ranges by half, resulting in a –4 penalty on Perception checks. It has the same effect on flames, ranged weapon attacks, and Perception checks as severe wind."

It later says: "In addition to automatically extinguishing any unprotected flames, winds of this magnitude cause protected flames (such as those of lanterns) to dance wildly and have a 50% chance of extinguishing these lights. Ranged weapon attacks and Perception checks are at a –4 penalty. This is the velocity of wind produced by a gust of wind spell."

Does this mean that rain imposes a -8 penalty to perception?

[Loengrin]

magispitt wrote:

The weather section says: "Rain reduces visibility ranges by half, resulting in a –4 penalty on Perception checks. It has the same effect on flames, ranged weapon attacks, and Perception checks as severe wind."

It later says: "In addition to automatically extinguishing any unprotected flames, winds of this magnitude cause protected flames (such as those of lanterns) to dance wildly and have a 50% chance of extinguishing these lights. Ranged weapon attacks and Perception checks are at a –4 penalty. This is the velocity of wind produced by a gust of wind spell."

Does this mean that rain imposes a -8 penalty to perception?

Yes, -8 perception for those who depends on torchs or lanterns to see... -4 to those who don't depend on flame to see (light spell is your friend :p )