Which was known about at the time. The ideal gas law for example dates back to 1834 or 27 years before the oldest measurements in this dataset. But even that was not needed with Barometer’s dating back to 1643 and vacuum pumps originating in 1650 allowed for pressure calibration making the current weather unimportant.

Anyway, I think people are vastly underestimating just how far scientists where calibrating things back then. Clock making for example cares deeply about the current temperature.