The Y axis is the pressure in hPa and the X axis is the time (4 days)
I think it is very interesting the fact that the boiling and freezing temperature of water change periodically due these barometric pressure changes. This is according to Water's Phase Diagram:
So, I was thinking to make a plot of how the boiling and freezing temperature of water change over the day, but I don't know how to describe those red lines as a function of temperature with respect pressure. The freezing red line could be described as a simple linear function but I don't know about the boiling red line .. Should I use Interpolation? Even so, do you know any reference with a table of Water's Phase Diagram?
Also, maybe this should be another question .. But, why the barometric pressure oscillates in that way?