The wiki page Barometer, pressure, and altimeter 
<https://github.com/weewx/weewx/wiki/Barometer,-pressure,-and-altimeter> says, 
that calculating the barometer value "requires the temperature 12 hours ago 
in order to correct for diurnal tide effects."

In contrary in the weewx.wxxtypes.PressureCooker.barometer() function the 
actual temperature is used only. There is no database access.

Could someone explain, what the reference to temperature 12 hours ago in 
the wiki means?

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