There are several options to analyze these data graphically. An appropriate graph to represent the weekly evolution of the humidity is a time series plot. To construct it, the data must first be stacked in a single column.
To pile up the data, proceed as usual: Data > Stack > Columns
Time series diagram of the variable ‘Week’.
Graph > Time Series Plot: Simple. Series: Week
The shown process is not stable: there is first an increasing trend followed by a sudden jump downwards. To distinguish the weekdays, different line types and colors can be used. To do so, double-click on the line. A dialog box that allows you to edit the lines appears:
Notice that, by ...