Thanks for looking into this thread.

The value is from a synthetic channel that is is turned OFF during the summer (no snow...

). So it should return a Zero, the graph does already show the zero-line, but I do not understand why the graph goes below zero? I am counting on the next version of WeatherCat, maybe there is a "minimum" available also fro graphs.

PS: An idea is to turn the channel ON and force it to return "0" - I will see what the graph will do then.