Possible issue with Openweathermap "current#rain"


I am experiencing some issue with the current#rain values, which are almost all the time 0.0 mm and sometimes spike to small numbers. Chart attached. Is this a problem in the normalisation ? Values for e.g. forecast3 are ok, the tell (today it is raining) 4.2mm and similar values.

Thanks for the help , Markus



I ended up using the 3 hour forecast as an approximation, works good enough for my needs and is free.

Thanks, M.