Articles
Explainers on what barometric pressure is, what a given reading means, and what the research does — and does not — say about pressure and how people feel. City-by-city numbers live on the city pages.
What Is inHg? — Inches of Mercury, Explained and Converted
inHg means inches of mercury. Standard sea-level pressure is 29.92 inHg (1013.25 hPa). Where the unit comes from, plus a chart to hPa, mb, mmHg and kPa.
Pressure at Sea Level — 1013.25 hPa vs. Station Pressure
Standard pressure at sea level is 29.92 inHg (1013.25 hPa, 101,325 Pa, 14.7 psi). Why forecasts use it and why a barometer at altitude reads far lower.
Low and high barometric pressure — cut-offs in inHg and hPa
Below 29.68 inHg (1005 hPa) is low and above 30.12 inHg (1020 hPa) is high on this site. Why other cut-offs differ, and how far real US cities go.
What Barometric Pressure Causes Headaches? — The Research
No pressure level is linked to headaches. Studies associate migraine with change, mostly falls of about 0.18–0.30 inHg (6–10 hPa), in some people and modestly.
Barometric Pressure Effects on the Body — High, Low, Change
No pressure level is known to be good or bad for the body. Pressure change is linked to symptoms in some people, modestly. What is known and what is not.
Barometric Pressure and Joint Pain — Is There a Level?
No pressure level is known to cause joint pain. Studies find small, mixed links with pressure change, cold and humidity, and disagree on direction.
Falling and Rising Barometric Pressure — What It Means
Falling pressure means a low or front is approaching; rising pressure means a high is building. How big a drop really is, and how often 50 US cities see one.
What Is Barometric Pressure? — A Plain-Language Guide
Barometric pressure is the weight of the air above you, the same thing as atmospheric or air pressure. Why it changes, its units, and how it is measured.
What Is Normal Barometric Pressure? — Range in inHg and hPa
Normal sea-level pressure is 29.68–30.12 inHg (1005–1020 hPa), centered on the 29.92 standard. Is 30 high? What 50 US cities average and the altitude trap.
Is 29.95 Barometric Pressure High or Low? — inHg Chart
29.95 inHg (1014.2 hPa) is normal sea-level pressure, just above the 29.92 standard. A lookup table from 29.50 to 30.50 inHg, and why the change matters more.