IIRC from SIM School, the changes in air transfer due to temperature and humidity are not linear as those two variables change, so the predictor has to be intelligent rather than a simple spreadsheet.
The Meyer Galileo also had temperature and humidity compensation, and came with a cool thermometer/humidity meter. FWIW for the first year I had it I diligently programmed in the information and followed the environment throughout the nights. After a while, I just listened and dealt with it as needed, absent the thermometer/humidity device. So sue me.