Weather Sense

• This Proficiency is an "Any Use" Skill, meaning that anyone can use it with a 1-2/10% chance.
• The cost to unlock this skill is one Proficiency Point.
• The Attribute Modifier for this skill is Wisdom.

This proficiency enables a character to determine something about what weather conditions will be in the place he or she is currently occupying during the coming six hours. A successful check indicates that the character correctly ascertains at least one general fact about the upcoming conditions: rain is coming, rain is not, it will get warmer/cooler, conditions will not change, etc. The DM always rolls proficiency checks for weather sense, and is not obliged to reveal the result of the attempt. The information gained from a successful check is whatever the DM deems appropriate for the character to know (and of course information must be at least generally true). A failed check indicates that no definite information is gained or (at the DM's discretion) some incorrect information is obtained.
Proficiency can only be used without penalty once in every twenty four hour period. For every attempt beyond the first on a given day, the DM will attach a cumulative +2 modifier to the die (decreasing the chance that multiple proficiency checks during a single day will succeed). Also, when a weather sense proficiency check is failed, any subsequent check in the next twelve hours will automatically fail.
Sometimes impending weather is so obvious that even a character not using this proficiency will be able to tell what is going to happen. In such cases, the DM should not require or even acknowledge, and attempt for a proficiency check and should instead simply describe the conditions, which would be apparent for anyone who can see. Example: Anyone ought to know that "a mass of dark clouds on the horizon, moving toward you" is a pretty clear sign that a rainstorm is on the way.