Historical eventOctober 232015

Atmospheric pressure

The lowest sea-level pressure in the Western Hemisphere, and the highest reliably-measured non-tornadic sustained winds, are recorded in Hurricane Patricia, which strikes Mexico hours later, killing at least 13 and causing over $280 million in damages.

Everything on October 23Original source

In context

When
Friday, October 23 201511 years ago
Category
Historical eventA dated happening — a battle, treaty, launch, discovery, disaster or decision — recorded on this calendar day.
Era
21st century · 2010s
Recorded from
Wikipedia “On this day” feed

At a glance

Dates: From 2015.

What happened

Atmospheric pressure, also known as air pressure or barometric pressure, is the pressure within the atmosphere of Earth. The standard atmosphere is a unit of pressure defined as 101.325 kPa (1,013.25 hPa), which is equivalent to 1,013.25 millibars, 760 torr, about 29.9212 inHg, or about 14.696 psi. The atm unit is roughly equivalent to the mean sea-level atmospheric pressure on Earth; that is, the Earth's atmospheric pressure at sea level is approximately one atm.

October 23 through the years

Other entries on the same calendar day, in order.

  1. 20112011 Van earthquakes
  2. 2011National Transitional Council
  3. 2015Hurricane Patricia
  4. 2015Atmospheric pressure
  5. 2017War against the Islamic State
  6. 20182018 Rome escalator accident
  7. 2020Libyan civil war (2014–2020)
  8. 2022Xi Jinping
  9. 2022Myanmar civil war (2021–present)
  10. 2022Myanmar Air Force
  11. 2022Arshad Sharif

Also in 2015

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  • September 12Petlawad explosionAn explosion involving illegally stored mining detonators in Petlawad, India, killed 104 people and injured more than 150 others.
  • September 14LIGOPhysicists of the LIGO and Virgo projects first observed gravitational waves, the existence of which was predicted by Henri Poincaré in 1…
  • September 14First observation of gravitational wavesThe first observation of gravitational waves is made, announced by the LIGO and Virgo collaborations on 11 February 2016.
  • September 162015 Illapel earthquakeA 8.3 Mw earthquake strikes the Chilean city of Illapel, killing 15 people, injuring at least 34, leaving at least six missing, and causi…
  • September 182015 Camp Badaber attackTwo security personnel, 17 worshippers in a mosque, and 13 militants are killed during a Tehrik-i-Taliban Pakistan attack on a Pakistan A…
  • October 222015 Trollhättan school attackA sword-wielding man attacked students and teachers at a high school in Trollhättan, killing three people in Sweden's deadliest school at…

Everything we record for 2015 →

Sources

Cite this page

“Atmospheric pressure”, What's On This Date, https://whatsonthisdate.com/app/event/atmospheric-pressure-2015-october-23, accessed October 23, 2026.

Cite the underlying source as well — the source links above go to the record this entry is adapted from.

Questions about this entry

When did Atmospheric pressure happen?

October 23 2015 — 11 years ago, on a Friday.

Where does this text come from?

Wikipedia “On this day” feed. Summaries are short adaptations that link back to the source, not reprints.

How do I cite this page?

Use the ready-made citation near the sources at the bottom of the page, and follow the source link to cite the underlying record as well.

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