How do I Clear the Rain Values on the TP2700WC Weather Station?

Press set on the display console till you enter the setup mode.

Scroll to calibration settings. Scroll to rain calibration settings. First you need to set the Rain Day, Rain Week, Rain Month, Rain Year, Rain Total calibration setting all to zero. Next you need to power cycle the display console. Next you need to go to the software and clear min/max.