Frequently Asked Questions

Barometric pressure (also called atmospheric pressure) is the weight of the air pressing down on Earth's surface. It's measured in inches of mercury (inHg) in the US or millibars (mb) internationally. Normal pressure at sea level is 29.92 inHg or 1013.25 mb.

Our pressure data updates every 15-30 minutes from weather stations worldwide. The "Last updated" timestamp on each city page shows when the data was last refreshed.

We source our data from professional weather services that aggregate readings from thousands of weather stations globally. This ensures accuracy and reliability across all locations.

Barometric pressure varies due to several factors:

• Elevation: Higher altitudes have lower pressure
• Weather systems: High and low pressure systems moving through
• Temperature: Warm air is less dense than cold air
• Humidity: Moist air is lighter than dry air
• Geographic features: Mountains, valleys, and coastlines affect local pressure

You have three options:

1. GPS Detection: Click "Detect My Location" on the homepage
2. Search: Type any city name in the search box
3. Browse: Navigate through our Cities menu to find your location

Yes! Our search feature works for virtually any location worldwide. If your town isn't in our pre-indexed list of 1,850+ cities, we'll create a dynamic page with real-time pressure data for that location.

We request location permission only to show you pressure data for your exact location. We don't store or track your location - it's used once to fetch current pressure data and then discarded. You can deny permission and still use the search feature.

• High Pressure (>30.20 inHg): Generally indicates fair, stable weather
• Normal Pressure (29.80-30.20 inHg): Typical conditions
• Low Pressure (<29.80 inHg): Often associated with clouds, precipitation

Some people are sensitive to pressure changes and may experience:

• Headaches or migraines
• Joint pain or arthritis flare-ups
• Sinus pressure
• Mood changes

Note: Always consult healthcare professionals for medical advice. Our data is for informational purposes only.

Rapid pressure changes can affect the pressure in your sinuses and inner ear, potentially triggering headaches in sensitive individuals. Dropping pressure often precedes storms, which is why some people can "feel" weather changes coming.

Many arthritis sufferers report increased pain with low pressure and approaching storms. High, stable pressure often correlates with less joint discomfort, though individual responses vary.

Use these conversion formulas:

• 1 inHg = 33.86 mb
• 1 mb = 0.0295 inHg

Or use our Pressure Converter Tool for instant conversions.

Station pressure is the actual pressure at a location's elevation. Sea level pressure is adjusted to what the pressure would be at sea level, allowing for fair comparison between locations at different elevations. We display sea level pressure for consistency.

Pressure changes are caused by:

• Movement of weather systems (highs and lows)
• Temperature changes (warming and cooling)
• Altitude changes in the atmosphere
• Water vapor content changes

Many anglers believe fishing is best when:

• Pressure is falling (fish feed more before storms)
• During stable pressure after initial drop
• Normal to slightly low pressure (29.70-29.90 inHg)

High pressure often means slower fishing as fish may be less active.

High pressure: Excellent for most outdoor activities - clear skies, stable weather

Low pressure: Be prepared for possible rain, wind, or storms

Rapidly changing: Weather conditions may change quickly