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Barometric pressure can be affected by a variety of weather conditions and atmospheric phenomena. Some of the factors that can influence barometric pressure include:

1. Weather Systems: Barometric pressure tends to drop as a low-pressure weather system, such as a storm or cyclone, approaches an area. These systems are often associated with rainy or windy weather.
2. Altitude: Barometric pressure decreases with increasing altitude. This is why barometric pressure readings are often adjusted to sea level to provide a standard reference point.
3. Temperature: Warmer air is less dense than cooler air, so barometric pressure tends to be lower in warm weather and higher in cold weather.
4. Humidity: Moist air is less dense than dry air, so barometric pressure tends to be lower in humid conditions and higher in dry conditions.
5. Time of Day: Barometric pressure typically follows a daily pattern, with the lowest pressure often occurring in the early morning and the highest pressure occurring in the late afternoon.
6. Local Conditions: Barometric pressure can also be influenced by local factors such as terrain, vegetation, and proximity to bodies of water.

These factors can all contribute to changes in barometric pressure, which may be felt by individuals who are sensitive to these changes, such as those with fibromyalgia.