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Calibrate Relative Pressure using a Raspberry Pi computer

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--- Quote from: watsonm on November 12, 2022, 04:00:14 AM ---Hi, sorry I missed your post.

All I can tell you is my experience.  I use that formula and regulary compare it to the website and my station seems to track it quite well

--- Quote ---,-2.434,5,i:pressure
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Since you are at a low elevation - temperature does not matter much..may be at most 0.6 hPa at temperature extremes.

I took a look at METAR EGHH. It reports QNH. I am pretty sure the MET Office reports SLP with a lot more accuracy than QNH so you can compare the two..

Your ISA temperature at 103m is about 14C so at 14C QNH = QFF (Windy's isobars) At low elevations, a simple additive constant of 12.3 hPa would be even simpler than the github formula. In other words, add 12.3 to your current live station pressure reading. But if your formula is working for you, keep it.

Keep an eye on it on the coldest day of the year and see how it goes.


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