Player's Handbook[]
This proficiency enables the character to make intelligent guesses about upcoming weather conditions. A successful proficiency check means the character has correctly guessed the general weather conditions in the next six hours. A failed check means the character read the signs wrong and forecast the weather incorrectly. The DM should roll the check secretly. A proficiency check can be made once every six hours. However, for every six hours of observation, the character gains a +1 bonus to his ability score (as he watches the weather change, the character gets a better sense of what is coming). This modifier is cumulative, although sleep or other activity that occupies the attention of the character for a long period negates any accumulated bonus.
Sometimes impending weather conditions are so obvious that no proficiency check is required. It is difficult not to notice the tornado funnel tearing across the plain or the mass of dark clouds on the horizon obviously headed the character's way. In these cases, the player should be able to deduce what is about to happen to his character anyway.
Player's Option: Skills & Powers[]
Weather Knowledge: A character with this proficiency has a knowledge of winds, humidity, clouds, and seasons and can accurately predict the immediate weather simply by looking at the sky. With a proficiency check the character can predict what will happen during the next 12 hours. Modify the check up to +/–6, with a 0 modifier to predictions for the weather six hours ahead.
Campaign Option: Council of Wyrms Setting[]
Weather Sense is described in the Player's Handbook. A successful check means the dragon knows the weather for the next six hours. One check can be made every six hours. For every six hours spent doing nothing but watching the weather, the dragon can add +1 to its ability score.
Hatchlings can't select this proficiency.