how to read an antique aneroid barometer?

Look at where the main needle points on the numbered scale. That gives you the current atmospheric pressure in inches of mercury. Turn the front knob to align the marker hand directly over the main needle. When you check back later, you will see if the pressure has dropped or risen based on how far the needle moved from your marker.

We found this old wooden weather dial thing in my grandparents' house but the needle never seems to move at all no matter what the weather is doing outside, can it be fixed?

A stuck needle usually points to dust in the mechanism or a hardened drop of old oil in the arbor pivots. The internal linkages are delicate and easily jammed by decades of airborne dirt. Sometimes the vacuum cell itself has cracked and lost its seal. A specialist can test the cell and clean the gears, which frequently gets them working again.

does barometer altitude matter?

Yes. Air pressure drops the higher you go above sea level. If you move an antique aneroid barometer from the coast to a house on a hill, it will read artificially low. You must reset the back screw to match local reports.

The dial on mine has words like stormy and very dry but it always seems to rain when it says fair, so why are the words even printed on there?

Those traditional weather terms are a Victorian marketing habit. They give a rough guide, but atmospheric pressure alone does not dictate rain or shine with total precision. The rate of change matters more than the specific word the needle rests on. A rapid drop indicates worsening weather, even if the needle is still pointing at the word fair.

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Antique Aneroid Barometers Dated 1900 - 1920

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Antique aneroid barometers track shifts in atmospheric pressure to predict weather changes without using liquid mercury, relying instead on a sealed brass vacuum chamber linked to a dial pointer set into a carved wood or metal case.