[werk_ag]

... Is there no way to display inches?

// --------------------------------------------------------------------------------------
//   Define data display units
// --------------------------------------------------------------------------------------
#define Date_Time_Format 1     // 0 for dd-mm-yyyy, 1 for yyyy/mm/dd
byte Temp_Display_Unit = 1;    // 0 for ºC, 1 for ºF
byte ATM_Display_Unit  = 1;    // 0 for mBar, 1 for inHg
byte Rain_Display_Unit = 0;    // no setting, always mm
byte Wind_Display_Unit = 1;    // 0 for Km/h, 1 for mph, 2 for m/s, 3 for Knots

I know that commonly the rainfall in USA is expressed in inches. Unfortunately for USA users, the WeatherDuino can only display the rainfall (and rainfall rate) in mm. I don't remember where but there are a discussion on the forum about this matter. The main reason is about precision, to display 0.1mm of rain in inches, we need to use at least 4 decimal places.