Omg it’s my time to shine.

The relation between temperature and pressure has to do with the ideal gas law: PV = nRT Where P is pressure, V is volume, n is moles of gas present, R is a constant, and T is temperature.

From this equation, we can see Pressure and Temperature are inherently related. If all else is the same (e.g. volume doesn’t change and the moles of gas don’t change) when pressure goes up, temperature follows suit.

Pressure, in meteorological terms, you can imagine as a huge stack (of air) over your head. Think of a column of bricks on top of your head at the very point you’re standing. When pressure is low, air flows inward and up (removing bricks from your head). When pressure is high, air flows outward and down (putting more bricks on your head)

Higher pressure literally means there is more pressure on your body at that time and place you are standing. In our example, imagine more bricks on top of your head than when it’s lower pressure.

I’m not exactly sure how it relates to sinuses, but the body must be able to detect these subtle differences, and that’s why you feel different.

There are other meteorological and environmental factors possibly at play too such as inversion layers that act as blankets and “trap” pollution, warmer temps so flora and fauna react as well, triggering allergies earlier because of warmer weather.

I have a degree in meteorology which I haven’t used in a long time, so this was a fun exercise for me. Thanks!