Set it & forget it

The Vaisala Rain Gauge RG13 (and the RG13H heated option) are built to measure liquid precipitation in remote and unattended applications, and designed to operate in even the harshest environments.
The automated tipping mechanism triggers after a predetermined quantity of rainfall, and measurements are constantly relayed to capture accurate measurements during constant rainfall.
The heating element on the RG13H automatically kicks in when the temperature drops below +4 °C (+39 °F).