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- Normal: Cold temperatures (Between 0° and 40° Fahrenheit during the day, 10 to 20 degrees colder at night.), Calm winds (Wind speeds are light (0 to 10 mph)).
- Inclement (Snow): Snow reduces visibility ranges by half, resulting in a -4 penalty on Spot and Search checks. It has the same effect on flames, ranged weapon attacks, and Listen checks as severe wind. And it costs 2 squares of movement to enter a snow-covered square. A day of snowfall leaves 1d6 inches of snow on the ground.
- Abnormal: Heat Wave: Raises temperature by +10° F (Between 10° and 50° Fahrenheit during the day, 10 to 20 degrees colder at night.), Calm winds (Wind speeds are light (0 to 10 mph)).
- Snowstorm: The combined effects of precipitation (or dust) and wind that accompany all storms reduce visibility ranges by three quarters, imposing a -8 penalty on Spot, Search, and Listen checks. Storms make ranged weapon attacks impossible, except for those using siege weapons, which have a -4 penalty on attack rolls. They automatically extinguish candles, torches, and similar unprotected flames. They cause protected flames, such as those of lanterns, to dance wildly and have a 50% chance to extinguish these lights. In addition, snowstorms leave 1d6 inches of snow on the ground afterward.
- Abnormal: Cold Snap: Lowers temperature by -10° F (Between -10° and 30° Fahrenheit during the day, 10 to 20 degrees colder at night.), Calm winds (Wind speeds are light (0 to 10 mph)).