A long term trend is shown above using a 6 month window. The Title show the value you selected and the Maximum Value means that was the option selected. It would save Average Values if that option was selected.
All Temperature values are in degrees Celcius, the scale is on the lefthand side of the chart. Note: that the scales changes with the data to give the best view, so please look at your scales.
The viewing window may be adjusted by grabbing and dragging the time scale on the bottom of the chart.
The chart may be printed, saved to a file, or put on the clipboard (for pasting to another program) by using the toolbar buttons directly above the chart.
You may change the values plotted by repeating the selection or options process at any time.