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Physics
Atmospheric Sciences

What is the barometric pressure at different altitudes?

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February 16, 2010 2:21PM

In general, barometric pressure, or atmospheric pressure, drops as you go up in elevation. For example, at 18,000 ft. above sea level, the average barometric pressure is about half the average pressure at sea level

(see the related links for charts)

However, barometric pressure also varies widely with the weather (weather charts almost always show the movement of low pressure and high pressure zones), so true barometric pressure cannot simply be calculated, but must be measured. In the United States, the National Oceanic and Atmospheric Administration provides hourly barometric readings for many locations across the country

(see related National Weather Service measurement link)