With units set to metric, the rainfall amounts plotted on Wundermap do not make much sense. On the popup box, rainfall is shown in centimetres, but the data on the map is neither centimetres, millimetres or inches. Recent examples on the map are a value of 0.09 (actual station rainfall 6.35mm) and 0.07 (actual station rainfall 4.83mm). If anyone can work out what these map values represent, please let me know!