Hi,

It’s not clear to me what that plot shows, it says cumulative; is it rainfall 
in the last hour? It’s not rainfall this day. 

Since v3.9.0 WeeWX has been able to plot cumulative data; however, as far as I 
know the accumulation only starts at the earliest time of the plot and 
continues over the entire plot. So for a Standard WeeWX ‘day’ plot the 
accumulation starts 27 odd hours before the current time and the data is 
accumulated over the entire 27 hours. Not quite what you want.

Thinking outside the box you could create a similar plot by creating a custom 
field in your archive and saving your cumulated data in that field. You could 
then use the WeeWX plot capabilities in the normal (non-cumulative) manner to 
plot that custom field.

Gary

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