Susan Mackay <[email protected]> writes:

> Also doesn't it vary with temperature?
> The formula I use is at  Conversion to sea-level pressure Calculator - High 
> accuracy calculation (casio.com) 
> <https://keisan.casio.com/exec/system/1224575267> (which is also used in a 
> number of other sites).

Yes, for barometric pressure reduction temperature matters.

When weewx does the reduction, the formula is:

https://github.com/weewx/weewx/blob/master/bin/weewx/wxformulas.py#L266

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