barometer.today shows the air pressure for a city: what it is now, which way it is going, and how much it has changed since yesterday. The graph on each city page covers the week behind you as well as the week ahead, because people often come here to make sense of a day that has already passed.
You can look up almost any town, not just the large ones, and read the figure in whichever unit you are used to.
Why a site for one number
Most weather numbers have an authority behind them. Ultraviolet has the WHO index with its colour bands. Air quality has national indexes. Pressure has none of that, so weather sites usually print the figure in a table and explain nothing.
Plenty of people want more than that: people with a barometer on the wall, and the many who say they can feel a change coming. This site is for them.
What it does not do
It does not tell you how you will feel. Research on pressure and headaches has run for decades and still disagrees with itself, so there is no health grade or pain scale here, and there will not be one.
It is also not a general weather site. Rain, wind and temperature appear on a city page only where they help you read the pressure.
Who runs it
barometer.today is part of SimpleMeteo, a small family of weather sites that also covers ultraviolet, pollen, air quality and weather history. They share a way of working.
There are no accounts, no newsletter and no advertising. Nothing is sold or shared; the privacy policy lists the little that is stored.
Something wrong?
The speech-bubble button in the bottom corner of every page goes straight to a person. A sentence that is wrong is the most useful thing you can report.
How this works explains where the figures come from.
