@WFmarketing
Thank you for engaging! We continue to work on our common system. 
I would like to add experience to precipitation in the form of ice grains.
20. January fell 0.4 mm ice-precipitated precipitations while WF recorded 1.0 mm.
The previous evenings and nights I also had a mix of rainfall in the form of ice grains and icy rain. The handy rain meter was 7.0mm while WF recorded 4.6mm.
I hope that you will use this information in developing the CL System for Rain.
Regards!